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    Wyświetlanie 1-15 z 15
    Tytuł:
    Influence of Annealing Treatment on Deep Drawing Behavior of Q235 Carbon Steel /410/304 Stainless Steels Three-Layer Composite Plate
    Autorzy:
    Lv, Zehua
    Zhang, Zhixiong
    Han, Jianchao
    Wang, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2106574.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite plate
    deep drawing
    annealing
    microstructure
    Opis:
    Effect of annealing treatment on deep drawing behavior of hot-rolled Q235 carbon steel/410/304 stainless steel three-layer composite plate was investigated. Deep drawability of the unannealed composite plates exhibits a sharp difference for various contact surfaces with the die. The limit drawing ratio (LDR) of the composite plate with the carbon steel contacting the die is 1.75, while it is 1.83 with the stainless steel contacting the die due to the different mechanical responses to the tensile stress at the corner of the die. After annealing at 900°C for 2 h, however, the deep drawabilities of the composite plates both for various contact surfaces with the die are significantly improved and becomes almost identical, which are attributed to the stress relief, the enhanced ductility and the improved interface bonding strength of the hot-rolled component plates during annealing.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 421--433
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Assisted Active-Passive Filling Friction Stir Repairing to Eliminate Volume Defects
    Autorzy:
    Wang, Tao
    Gong, Xue
    Ji, Shude
    Xue, Gang
    Lv, Zan
    Powiązania:
    https://bibliotekanauki.pl/articles/2049431.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir repairing
    magnesium alloys
    defects
    ultrasonic
    mechanical properties
    Opis:
    Ultrasonic assisted active-passive filling friction stir repairing (A-PFFSR) was proposed to repair volume defects in the metallic parts. Sound joints without interfacial defects could be achieved. Firstly, the ultrasonic was beneficial to improving material flow and atom diffusion, and then eliminated kissing bond defects compared to conventional A-PFFSR joints. Secondly, the equiaxed grains were refined by ultrasonic vibration. Lastly, the repairing passes were reduced due to the ultrasonic, which decreased softening degree of the repaired joints. The maximum tensile strength of 150 MPa was achieved. Therefore, this strategy to repair the volume defects is feasibility and potential in the remanufacturing fields of aerospace and transportation.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 217-222
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized PI observer design for descriptor linear system
    Autorzy:
    Wang, Xin-Tao
    Yu, Hai-Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/229300.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized proportional-integral observer
    Sylvester matrix equation
    regularity
    impulse-freeness
    Opis:
    A kind of generalized proportional-integral (GPI) observer for descriptor linear systems is introduced. We first propose two complete parametric solutions to generalized Sylvester matrix equation corresponding to the left eigenvector matrices in the case of Jordan form. Then a parametric design approach for the observer is presented. The proposed method provides all parametric expression of the gain matrices and the corresponding finite left eigenvector matrix and guarantees the regularity and impulse-freeness of the expanded error system. Two numerical examples are given to explain the design procedure and illustrate the effectiveness of the proposed method.
    Źródło:
    Archives of Control Sciences; 2019, 29, 4; 585-601
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation studies on the influence of other combustible gases on the characteristics of methane explosions at constant volume and high temperature
    Autorzy:
    Luo, Zhenmin
    Liu, Litao
    Gao, Shuaishuai
    Wang, Tao
    Su, Bin
    Wang, Lei
    Yang, Yong
    Li, Xiufang
    Powiązania:
    https://bibliotekanauki.pl/articles/1853863.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gaz palny
    ciśnienie wybuchu
    temperatura płomienia
    constant volume
    volume fraction of combustible gas
    initial temperature
    adiabatic flame temperature
    maximum explosion pressure
    Opis:
    Gas explosions are major disasters in coal mining, and they typically cause a large number of deaths, injuries and property losses. An appropriate understanding of the effects of combustible gases on the characteristics of methane explosions is essential to prevent and control methane explosions. FLACS software was used to simulate an explosion of a mixture of CH4 and combustible gases (C2H4, C2H6, H2, and CO) at various mixing concentrations and different temperatures (25, 60, 100, 140 and 180℃). After adding combustible gases to methane at a constant volume and atmospheric pressure, the adiabatic flame temperature linearly increases as the initial temperature increases. Under stoichiometric conditions (9.5% CH4-air mixture), the addition of C2H4 and C2H6 has a greater effect on the adiabatic flame temperature of methane than H2 and CO at different initial temperatures. Under the fuel-lean CH4-air mixture (7% CH4-air mixture) and fuel-rich mixture (11% CH4-air mixture), the addition of H2 and CO has a greater effect on the adiabatic flame temperature of methane. In contrast, the addition of combustible gases negatively affected the maximum explosion pressure of the CH4-air mixture, exhibiting a linearly decreasing trend with increasing initial temperature. As the volume fraction of the mixed gas increases, the adiabatic flame temperature and maximum explosion pressure of the stoichiometric conditions increase. In contrast, under the fuel-rich mixture, the combustible gas slightly lowered the adiabatic flame temperature and the maximum explosion pressure. When the initial temperature was 140℃, the fuel consumption time was approximately 8-10 ms earlier than that at the initial temperature of 25℃. When the volume fraction of the combustible gas was 2.0%, the consumption time of fuel reduced by approximately 10 ms compared with that observed when the volume fraction of flammable gas was 0.4%.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 2; 279-295
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Fretting Fatigue of Tungsten Carbide Coating Based on Strain Energy Density Methods
    Autorzy:
    Zeng, Xin
    Wang, Xiaoxiao
    Ping, Xuecheng
    Wang, Renjie
    Hu, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2203727.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC coating
    crack initiation
    cracking angle
    critical plane
    life prediction
    Opis:
    The numerical solutions of stress and strain components on the critical plane of tungsten carbide coating were solved based on the critical plane method in three-dimensional coordinate system, and accordingly three strain energy density parameters (Smith-Watson-Topper, Nita-Ogatta-Kuwabara and Chen parameters) were determined to reveal the fretting fatigue characteristics of tungsten carbide coating. In order to predict the fretting fatigue life based on the strain energy density criterion, the expressions between the strain energy density parameter and the fretting fatigue life was obtained experimentally. After the comparison of the three strain energy parameters, it was found that all three parameters could accurately predict the crack initiation position, but only the Smith-Watson-Topper parameters could accurately predict the crack initiation angle. The effects of cyclic load, normal load and friction coefficient on fretting fatigue damage behaviors were discussed by using the Smith-Watson-Topper criterion. The results show that the fretting fatigue life decreases with the increase of cyclic load; an increase in the normal contact load will cause the Smith-Watson-Topper damage parameters more concentrated at the outer edge of the bridge foot; a decrease in the friction coefficient will increase the Smith-Watson-Topper damage parameters in the middle of the contact surface.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 21--30
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation on mode II fracture performance of old-new concrete
    Autorzy:
    Liu, Shuang
    Shi, Zhenwu
    Jiang, Tao
    Wang, Huili
    Powiązania:
    https://bibliotekanauki.pl/articles/2179402.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton nowy-stary
    osadzenie
    pręt zbrojeniowy
    włókno bazaltowe
    pękanie typu II
    odporność na pękanie
    energia pęknięcia
    new-old concrete
    planting
    rebar
    basalt fiber
    mode II fracture
    fracture toughness
    fracture energy
    Opis:
    The old-new concrete interface is the weakest part in the composite structure, and there are a large number of microcracks on the interface. In order to study the mode II fracture performance of the bonding surface of old-new concrete, the effect of planting rebar and basalt fiber is investigated. Nine Z-shaped old-new concrete composite specimens with initial cracks are made. Nine shear fracture load-displacement curves are obtained, and the failure process and interface fracture are discussed. On this basis, the mode II fracture toughness and fracture energy are obtained. The regression equations for fracture toughness and fracture energy are deduced with analysis of variance (ANOVA). The results show that fracture toughness and fracture energy increase with the increase of planting rebar number and basalt fiber content. With the increase of the planting rebar number, mode II fracture toughness and fracture energy increase more significantly. Planting rebar is the major factor for mode II fracture performance.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 469--480
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Harmonic mitigation in 18-pulse rectifier based on zigzag autotransformer by DC side auxiliary circuit
    Autorzy:
    Liu, Jiongde
    Chen, Xiaoqiang
    Wang, Ying
    Chen, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/949860.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    18-pulse rectifier
    harmonic suppressing
    zigzag autotransformer
    Opis:
    To improve the power quality of a multi-pulse rectifier, a zigzag 18-pulse uncontrolled rectifier with an auxiliary circuit at the DC side is proposed. When the grid-side currents are sinusoidal waves, the required DC side injection currents to be compensated can be obtained by analyzing the AC-DC side relationship of diode bridge rectifiers. Then the 6 compensation currents generated by an active auxiliary circuit are injected into the DC side to eliminate the grid-side harmonics of the rectifier. The simulation results verifying the correctness of the theoretical analysis show that the proposed rectifier can mitigate the harmonic content, as the total harmonic distortion of the grid-side current is about 1.45%. In addition, the single-phase inverter used in the active auxiliary circuit has the characters of simple circuit structure and easy controllability.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 4; 891-905
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on hybrid modeling and predictive energy management for power split hybrid electric vehicle
    Autorzy:
    Wang, Shaohua
    Zhang, Sheng
    Shi, Dehua
    Sun, Xiaoqiang
    Yang, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2173576.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power split HEV
    energy management
    mixed logical dynamical model
    piecewise affine
    model predictive control
    podział mocy
    zarządzanie energią
    silnik hybrydowy
    model dynamiczny
    model mieszany
    model logiczny
    technologia fragmentarycznie pokrewna
    kontrola predykcyjna modelu
    Opis:
    Due to the coexistence of continuity and discreteness, energy management of a multi-mode power split hybrid electric vehicle (HEV) can be considered a typical hybrid system. Therefore, the hybrid system theory is applied to investigate the optimum energy distribution strategy of a power split multi-mode HEV. In order to obtain a unified description of the continuous/discrete dynamics, including both the steady power distribution process and mode switching behaviors, mixed logical dynamical (MLD) modeling is adopted to build the control-oriented model. Moreover, linear piecewise affine (PWA) technology is applied to deal with nonlinear characteristics in MLD modeling. The MLD model is finally obtained through a high level modeling language, i.e. HYSDEL. Based on the MLD model, hybrid model predictive control (HMPC) strategy is proposed, where a mixed integer quadratic programming (MIQP) problem is constructed for optimum power distribution. Simulation studies under different driving cycles demonstrate that the proposed control strategy can have a superior control effect as compared with the rule-based control strategy.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137064
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Columnar Dendrite Morphology and Solute Concentration of GH3039 Nickel-Based Superalloys during Wire and Laser Additive Manufacturing: Insights from Phase Field Simulations
    Autorzy:
    Zong, Nanfu
    Wang, Zheng
    Liu, Yang
    Liang, Xinghong
    Jing, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2203717.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wire and laser additive manufacturing
    phase field simulation
    solute concentration
    interface crystallographic deflection
    columnar dendrite
    Opis:
    Wire and laser additive manufacturing (WLAM) can produce outstanding mechanical properties of GH3039 nickel-based superalloys. A quantitative rapid phase field model with solute trapping kinetics has been developed during the rapid solidification process, where a range of process conditions are considered in terms of thermal gradients and pulling speeds. Intergranular hot cracking is found to occur at boundaries of tilted columnar dendrite in the GH3039 nickel-based superalloys. The simulations demonstrate that the phase field model considering the interface deflection can represent the dendrite growth during additive manufacturing more realistically. With the aid of numerical simulations, it is determined that dendrite growth morphologies transform from symmetrical columnar dendrite to tilted columnar dendrite as the interface crystallographic deflection is increased, while increasing the deflection angle can lead to uneven composition of material matrix, especially at the columnar dendrite interface. Solute concentrations at the columnar dendrite interface tend to promote hot cracking in additively manufactured Ni-based superalloy.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 387--393
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect recognition of buried pipeline based on approximate entropy and variational mode decomposition
    Autorzy:
    Ju, Haiyang
    Wang, Xinhua
    Zhang, Tao
    Zhao, Yizhen
    Ullah, Zia
    Powiązania:
    https://bibliotekanauki.pl/articles/221572.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Buried Pipeline
    Defect Recognition
    Geomagnetic Anomaly Detection
    Variational Mode Decomposition
    Approximate Entropy
    Opis:
    The study aimed to examine the use of Geomagnetic Anomaly Detection (GAD) to locate the buried ferromagnetic pipeline defects without exposing them. However, the accuracy of GAD is limited by the background noise. In the present work, we propose an approximate entropy noise suppression (AENS) method based on Variational Mode Decomposition (VMD) for detection of pipeline defects. The proposed method is capable of reconstructing the magnetic field signals and extracting weak anomaly signals that are submerged in the background noise, which was employed to construct an effective detector of anomalous signals. The internal parameters of VMD were optimized by the Scale–Space algorithm, and their anti-noise performance was compared. The results show that the proposed method can remove the background noise in high-noise background geomagnetic field environments. Experiments were carried out in our laboratory and evaluation results of inspection data were analysed; the feasibility of GAD is validated when used in the application to detection of buried pipeline defects.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 4; 739-755
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new optical frequency transfer method via fibre based on active phase noise compensation with single acousto-optic modulator
    Autorzy:
    Wang, Guoyong
    Yao, Yuanbo
    Yan, Tao
    Bian, Lang
    Meng, Yansong
    Powiązania:
    https://bibliotekanauki.pl/articles/221592.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acousto-optic modulator
    optical frequency transfer over fibre
    phase noise compensation
    relative frequency stability
    Opis:
    In this paper, we propose and experimentally demonstrate a new method for optical frequency transfer over fibre. Instead of dual acousto-optic modulators (AOMs) as adopted in the traditional fibre phase noise compensation setup, here an active fibre phase noise compensation scheme with a single acousto-optic modulator (AOM) is used. The configuration simplifies the equipment of the user end while maintaining a high-performance optical frequency transfer stability. We demonstrate an actively stabilized coherent transfer at an optical frequency of 193.55THz over 10-km spooled fibre, obtaining a relative frequency stability (Allan deviation) of 3.84 x 10-16/1 s and 4.08 x 10-18/104 s, which is improved by about 2~3 orders of magnitude in comparison with the one without any phase noise compensation that achieves a relative frequency stability of 1.81 x 10-14/1 s and 2.48 x 10-15/104 s.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 1; 115-124
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on hybrid modeling and predictive energy management for power split hybrid electric vehicle
    Autorzy:
    Wang, Shaohua
    Zhang, Sheng
    Shi, Dehua
    Sun, Xiaoqiang
    Yang, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2128153.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power split HEV
    energy management
    mixed logical dynamical model
    piecewise affine
    model predictive control
    podział mocy
    zarządzanie energią
    silnik hybrydowy
    model dynamiczny
    model mieszany
    model logiczny
    technologia fragmentarycznie pokrewna
    kontrola predykcyjna modelu
    Opis:
    Due to the coexistence of continuity and discreteness, energy management of a multi-mode power split hybrid electric vehicle (HEV) can be considered a typical hybrid system. Therefore, the hybrid system theory is applied to investigate the optimum energy distribution strategy of a power split multi-mode HEV. In order to obtain a unified description of the continuous/discrete dynamics, including both the steady power distribution process and mode switching behaviors, mixed logical dynamical (MLD) modeling is adopted to build the control-oriented model. Moreover, linear piecewise affine (PWA) technology is applied to deal with nonlinear characteristics in MLD modeling. The MLD model is finally obtained through a high level modeling language, i.e. HYSDEL. Based on the MLD model, hybrid model predictive control (HMPC) strategy is proposed, where a mixed integer quadratic programming (MIQP) problem is constructed for optimum power distribution. Simulation studies under different driving cycles demonstrate that the proposed control strategy can have a superior control effect as compared with the rule-based control strategy.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137064, 1--15
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A sampling method based on improved firefly algorithm for profile measurement of aviation engine blade
    Autorzy:
    Huang, Zhi
    Zhao, Liao
    Li, Kai
    Wang, Hongyan
    Zhou, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/221479.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aviation engine blade
    coordinate measurement machine
    profile measurement
    improved firefly algorithm
    Opis:
    Coordinate Measurement Machines (CMMs) have been extensively used in inspecting mechanical parts with higher accuracy. In order to enhance the efficiency and precision of the measurement of aviation engine blades, a sampling method of profile measurement of aviation engine blade based on the firefly algorithm is researched. Then, by comparing with the equal arc-length sampling algorithm (EAS) and the equi-parametric sampling algorithm (EPS) in one simulation, the proposed sampling algorithm shows its better sampling quality than the other two algorithms. Finally, the effectiveness of the algorithm is verified by an experimental example of blade profile. Both simulated and experimental results show that the method proposed in this paper can ensure the measurement accuracy by measuring a smaller number of points.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 4; 757-771
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomagnetic detection method for pipeline defects based on ceemdan and WEP-TEO
    Autorzy:
    Zhang, Tao
    Wang, Xinhua
    Chen, Yingchun
    Shuai, Yi
    Ullah, Zia
    Ju, Haiyang
    Zhao, Yizhen
    Powiązania:
    https://bibliotekanauki.pl/articles/220762.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geomagnetic detection
    pipeline defects
    magnetic field
    filtering
    data processing
    Opis:
    This paper presents a geomagnetic detection method for pipeline defects using complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and wavelet energy product (WEP) - Teager energy operator (TEO), which improves detection accuracy and defect identification ability as encountering strong inference noise. The measured signal is first subtly decomposed via CEEMDAN into a series of intrinsic mode functions (IMFs), which are then distinguished by the Hurst exponent to reconstruct the filtered signal. Subsequently, the scale signals are obtained by using gradient calculation and discrete wavelet transform and are then fused by using WEP. Finally, TEO is implemented to enhance defect signal amplitude, completing geomagnetic detection of pipeline defects. The simulation results created by magnetic dipole in a noisy environment, indoor experiment results and field testing results certify that the proposed method outperforms ensemble empirical mode decomposition (EEMD)-gradient, EEMD-WEP-TEO, CEEMDAN-gradient in terms of detection deviation, peak side-lobe ratio (PSLR) and integrated side-lobe ratio (ISLR).
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 345-361
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel
    Autorzy:
    Zhao, Bingge
    Wang, Yuanfang
    Sun, Chenyu
    Ding, Kai
    Wu, Guanzhi
    Wei, Tao
    Pan, Hua
    Gao, Yulai
    Powiązania:
    https://bibliotekanauki.pl/articles/2174565.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    medium Mn steel
    resistance spot welding
    cross-tension strength
    martensite
    fracture
    Opis:
    As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1293--1298
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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