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Wyszukujesz frazę "high speed steels" wg kryterium: Temat


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Tytuł:
Copper infiltrated high speed steel skeletons
Autorzy:
Madej, M.
Powiązania:
https://bibliotekanauki.pl/articles/379194.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
high speed steels
iron
tungsten carbide
powder metallurgy
infiltration
sintering
microstructure
stale szybkotnące
żelazo
węglik wolframu
metalurgia proszków
infiltracja
spiekanie
mikrostruktura
Opis:
Purpose: This article is a monographic summary of the most important research results from the last 10 years regarding HSS based materials. This materias were produced with powder metallurgy technology using spontaneous infiltration. The presented results answer the question of how iron, tungsten carbide and copper additives influence the final properties of these materials and present additional microstructural phenomena revealed during their manufacture. Design/methodology/approach: Materials were produced by spontaneous infiltration. Porous skeletons for infiltration were produced by pressing and pressing and sintering of mixed powders. Copper was used as the infiltrant. Findings: The molten copper was drawn into the porous skeletons, through a capillary action, and filled virtually the entire pore volume to get the final densities exceeding 97% of the theoretical value. Research limitations/implications: As part of further research, microstructures of M30WC composites obtained by direct infiltration of copper into as-sintered porous skeletons using TEM are planned. Practical implications: Efficiant mechanical strength, high hardness, adequate heat resistance and good wear resistance of M3 type 2 HSS powder produced by woter atomisation make it an attractive material for manufacture of valve train components, for example valve seat inserts. Originality/value: The novelty in the article are the results of research on the microstructure made using TEM, the results of testing materials after heat treatment, untypical for highspeed steels. The article attempts to explain the influence of iron addition on properties - such a slight loss of mass as a result of its addition. The second aim of this work is to analyse the microstructural changes during sintering porous skeletons made from HSS with WC additions.
Źródło:
Archives of Materials Science and Engineering; 2019, 98, 1; 5-31
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waviness at dry high-speed face milling of some hard steels
Autorzy:
Beşliu-Băncescu, Irina
Slătineanu, Laurenţiu
Coteaţă, Margareta
Powiązania:
https://bibliotekanauki.pl/articles/2052146.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
waviness
dry high-speed face milling
hard steels
milling parameters
hardness
empirical mathematical models
Opis:
Waviness is a parameter used to complete information on the machined surface state. There is little scientific and technical information on the influence exerted by the cutting conditions and the workpiece material hardness on the values of some parameters that define the waviness of milled surface. No works have been identified to present such information for dry high-speed face milling applied to hard steel workpieces. A factorial experiment with four independent variables at three variation levels was planned to model the influence of milling speed, feed, cutting depth, and steel hardness on the total heights of the profile and surface waviness for dry high-speed face milling. Mathematical processing of experimental results was used to identify the power type function and empirical mathematical models. These models highlight the direction of variation and the intensity of influence exerted by the considered input factors on the values of two waviness parameters in the case of dry high-speed face milling of samples made of four hard steels. It has been observed that the increase in steel hardness increases the total heights of the profile and surface waviness. In the case of two types of steel, a good correlation was identified between the values of the total profile waviness height and the total surface waviness height, respectively, using the Pearson correlation coefficient.
Źródło:
Metrology and Measurement Systems; 2021, 28, 4; 735-749
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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