Wszystkie pola: Zielinska, L. - Katalog OPAC zbiorów

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Tytuł:: Contribution of Microstructural Constituents on Hot Cracking of MAR-M247 Nickel Based Superalloy
Autorzy:: Rakoczy, Ł.
Grudzień, M.
Zielińska-Lipiec, A.
Powiązania:: https://bibliotekanauki.pl/articles/354437.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: superalloys
liquation cracking
gamma prime
MAR-M247
Opis:: The aim of this study is to investigate influence of selected parameters of gas tungsten arc welding on microstructure of MAR-M247 nickel based superalloy originating from turbine vane. MAR-M247 is a precipitation-strengthened superalloy which is widely used in aerospace engines. The main strengthening phase in this material is ordered L1₂ intermetallic γ' phase Ni₃ (Al, Ti). The surface of alloy was modified by electric arc in order to present microstructural changes in weld and heat affected zone. Investigation of the heat affected zone revealed that constitutional liquation of γ' particles and primary carbides is responsible for the formation of a liquid grain boundary layer which finally contributed to cracking. Scanning electron microscopy indicated high susceptibility to cracking of MAR-M247 alloy which is connected with high content of γ'-formers aluminum and titanium.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 181-189
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Effect of Cobalt Aluminate Content and Pouring Temperature on Macrostructure, Tensile Strength and Creep Rupture of Inconel 713C Castings
Autorzy:: Rakoczy, Ł.
Grudzień, M.
Cygan, R.
Zielińska-Lipiec, A.
Powiązania:: https://bibliotekanauki.pl/articles/356407.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pouring
investment casting
lost wax
superalloy
creep
Opis:: The effect of cobalt aluminate inoculant addition and melt-pouring temperature on the structure and mechanical properties of Ni-based superalloy was studied. The first major move to control the quality of investment cast blades and vanes was the control of grain size. Cobalt aluminate (CoAl₂ O₄ ) is the most frequently utilized inoculant in the lost-wax casting process of Ni-based superalloys. The inoculant in the prime coat of moulds and pouring temperature play a significant role in grain size control. The finest surface grains were obtained when the internal surface of shell mould was coated with cobalt aluminate and subsequently pouring was at 1480°C. The influence of selected casting parameters and inoculant addition on mechanical properties was investigated on the basis of tensile, creep and hardness testing. The effect of grain refinement on mechanical properties were consistent with established theories. Tests conducted at ambient temperature indicated a beneficial effect of grain refinement both on tensile strength and hardness. In contrast at elevated temperature during creep, the reverse trend was observed.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 3; 1537-1545
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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