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Mathematical Model for high temperature properties of cast nickel superalloys with high content of gamma prime phase
Author(s) -
Efimov A.
Publication year - 1994
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19940250708
Subject(s) - solidus , superalloy , materials science , creep , ultimate tensile strength , alloy , metallurgy , yield (engineering) , refractory metals , atmospheric temperature range , phase (matter) , composite material , thermodynamics , chemistry , physics , organic chemistry
This investigation relates to structural cast superalloys with improved oxidation resistance in the temperature range of 1100–1200°C. It was tried to clarify the role of heavy metal elements on mechanical properties of an alloy in the system Ni‐17at% Al‐3at% Cr‐Mo‐Ta‐W. Solidus temperature, yield strength at 20°C, ultimate tensile strength at 1200°C of polycrystal alloys and creep‐rupture life at 1000°C and 1200°C of single crystals <001> were investigated by means of experimental design and regression analysis techniques, It was determined that solidus temperature do not depend from W content, yield strength at 20°C and ultimate tensile strength at 1200°C strongly depend on Ta and W contents. The properties sharply increase with simultaneous adding of Ta+W. At 1200°C Mo content is a critical factor. The influence of alloying with Ta and W on the creep resistance of single crystals was examined. With increase of test temperature dependence of creep resistance from refractory additives appears to increase, but interval of an optimum alloying narrows.