|Anomalous yield and intermediate temperature brittleness behaviors of directionally solidified nickel-based superalloy|
|L. Y. Sheng; F. Yang; J. T. Guo; T. F. Xi
|Source Publication||Transactions of Nonferrous Metals Society of China
|Abstract||A nickel-based superalloy with good corrosion resistance was fabricated by directional solidification, and its microstructure and tensile properties at elevated temperatures were investigated. Microstructure observations reveal that the gamma' precipitates are arrayed in the gamma matrix regularly with some MC, Ni5Hf and M3B2 particles distributed along the grain boundary. The tensile tests exhibit that the tensile properties depend on temperature significantly and demonstrate obvious anomalous yield and intermediate-temperature brittleness (ITB) behavior. Below 650 degrees C, the yield strength decreases slightly but the ultimate tensile strength almost has no change. When the temperature is between 650 degrees C and 750 degrees C, the yield and ultimate tensile strengths rise rapidly, and after then they both decrease gradually with temperature increasing further. The elongation has its minimum value at about 700 degrees C. The TEM examination exhibits that sharing of the gamma' by dislocation is almost the main deformation mechanism at low temperatures, but the gamma' by-pass dominates the deformation at high temperatures. The transition temperature from shearing to by-pass should be around 800 degrees C. The anomalous yield and intermediate-temperature brittleness behaviors should be attributed to the high content of gamma'. In addition, the carbides and eutectic structure also contribute some to the ITB behaviors of the alloy.|
; xi, ting-fei] peking univ, shenzhen inst, shenzhen 518057, peoples r china. [yang, fang] shenzhen baoan int airport, shenzhen airlines, shenzhen 518128, peoples r china. [guo, jian-ting] chinese acad sci, inst met res, shenyang 110016, peoples r china.
; sheng, ly (reprint author), peking univ, shenzhen inst, shenzhen 518057, peoples r china.
L. Y. Sheng,F. Yang,J. T. Guo,et al. Anomalous yield and intermediate temperature brittleness behaviors of directionally solidified nickel-based superalloy[J]. Transactions of Nonferrous Metals Society of China,2014,24(3):673-681.
L. Y. Sheng,F. Yang,J. T. Guo,&T. F. Xi.(2014).Anomalous yield and intermediate temperature brittleness behaviors of directionally solidified nickel-based superalloy.Transactions of Nonferrous Metals Society of China,24(3),673-681.
L. Y. Sheng,et al."Anomalous yield and intermediate temperature brittleness behaviors of directionally solidified nickel-based superalloy".Transactions of Nonferrous Metals Society of China 24.3(2014):673-681.
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