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一、前言 Fe-Ni-Cr基高温合金在高温长期使用条件下或经长期热暴露之后析出TCP相是众所周知的。这些TCP相(σ、Laves、μ和G相)的数量、形态和分布将使合金的力学性能受到很大影响,尤其是室温冲击性能将随着使用温度的提高和时间的延长而降低。有些Ni基和Co基合金也存在这种现象。 陈国良、谢锡善等人在“铁基高温合金中μ相和σ相引起的晶界脆化”一文中指出,在15Cr-40Ni型和15Cr-25Ni型Fe基高温合金
I. INTRODUCTION It is well-known that Fe-Ni-Cr based superalloy precipitates TCP phase under the condition of long-term use under high temperature or after prolonged heat exposure. The number, morphology and distribution of these TCP phases (σ, Laves, μ and G phases) will greatly affect the mechanical properties of the alloy. In particular, the room temperature impact properties will decrease as the service temperature and time prolong. Some Ni-based and Co-based alloys also have this phenomenon. Chen Guoliang, Xie Xishan and others in the “iron-based superalloy μ phase and σ phase caused by grain boundary embrittlement,” a paper pointed out that in the 15Cr-40Ni and 15Cr-25Ni Fe-based superalloy