小角度晶界对一种第三代单晶高温合金760～980 ℃拉伸行为的影响

Effects of low angle boundaries on tensile behaviors of a third generation single crystal superalloy at 760-980 ℃

摘要

研究小角度晶界对一种第三代单晶高温合金在760、850、980 ℃条件下拉伸行为的影响，采用扫描电子显微镜、透射电子显微镜观察拉伸断裂后的显微组织。结果表明：带小角度晶界的第三代单晶高温合金拉伸性能优良；0°～8.9°小角度晶界对第三代单晶高温合金760、850、980 ℃屈服强度和抗拉强度无明显影响；980 ℃条件下11.4°晶界试样相对0°晶界试样的抗拉强度降低80 MPa；随晶界角度增加，0°～11.4°晶界试样的980 ℃断后伸长率呈下降趋势；随着小角度晶界角度增加或温度升高，带小角度晶界的第三代单晶高温合金沿晶断裂倾向增大。

Abstract

The influence of low angle boundaries (LABs) on the tensile behavior of a third generation single crystal superalloy at temperatures of 760, 850 ℃, and 980 ℃ has been explored. The microstructure of the specimens after tensile rupture is examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings reveal that the third generation single crystal superalloy with LABs demonstrates favorable tensile properties. LABs with angles ranging from 0° to 8.9° have a negligible impact on the yield strength and ultimate tensile strength of the alloy at 760, 850 ℃, and 980 ℃. At 980 ℃, the tensile strength of the specimen with LABs of 11.4° decreases by 80 MPa compared to that of the specimen with LABs of 0°. As the angle of the LABs increases, the elongation of the alloy with LABs in the range of 0°-11.4° at 980 ℃ exhibits a downward trend. Additionally, the propensity for intergranular fracture in the alloy with LABs becomes more pronounced as either the angle of the LABs increases or the temperature rises.

关键词

第三代单晶高温合金 / 小角度晶界 / 拉伸性能 / 断裂机制

Key words

third generation single crystal superalloy / low angle boundaries / tensile property / fracture mechanism

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