In the present study, the relationship between heat treatment, grain size, and the creep rupture properties of Fe–33Ni–19Cr alloy was investigated. The microstructure analysis showed that Fe–33Ni–19Cr alloy consists of the austenite phase matrix and a small number of precipitates such as titanium nitride and titanium carbides. Fe–33Ni–19Cr alloy shows an increase in steady-state creep rate with increased grain size from 94 to 381 μm, due to the grain boundary sliding mechanism. The result also exhibited that the alloy that was subjected to creep test failed in ductile mode and cavitation at the grain boundaries. The fracture surface shows a transgranular fracture but an intergranular fracture at the recrystallized grains at the fracture area. Taken together, the result exhibited that the Fe–33Ni–19Cr alloy subjected lower heat treatment temperature possess a smaller grain size, which led to better creep property along with more excellent service life during operation.

中文翻译：

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Fe-33Ni-19Cr合金组织与热处理蠕变行为的关系

在本研究中，研究了热处理、晶粒尺寸和 Fe-33Ni-19Cr 合金蠕变断裂性能之间的关系。显微组织分析表明，Fe-33Ni-19Cr合金由奥氏体相基体和少量氮化钛和碳化钛等析出物组成。由于晶界滑动机制，Fe-33Ni-19Cr 合金随着晶粒尺寸从 94 μm 增加到 381 μm，稳态蠕变速率增加。结果还表明，经过蠕变试验的合金在延性模式和晶界空化失效。断口为穿晶断口，断口处再结晶晶粒处为沿晶断口。综合起来，