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通过扫描电镜、透射电镜、微细相分析以及力学性能测试等,研究了固溶温度、时效温度、时效时间对LF2合金的微观组织和力学性能的影响。结果表明,LF2合金是以奥氏体为基体,主要的析出相有γ’、MC、Laves相,γ’相是合金中最主要的强化相。采用固溶温度990℃,时效温度760℃,时效时间10 h的热处理制度,合金可以获得最佳的性能,此时合金的抗拉强度为1201 MPa,屈服强度为772 MPa,断后伸长率为21.8%,断面收缩率为32%。
The effects of solution temperature, aging temperature and aging time on the microstructure and mechanical properties of LF2 alloy were studied by scanning electron microscopy, transmission electron microscopy, micro-phase analysis and mechanical properties testing. The results show that austenite is the main component of LF2 alloy, and the main precipitates are γ ’, MC and Laves phases. The γ’ phase is the main strengthening phase in the alloy. The optimum performance of the alloy is obtained by the heat treatment system with solution temperature of 990 ℃, aging temperature of 760 ℃ and aging time of 10 h. The tensile strength of the alloy is 1201 MPa, the yield strength is 772 MPa and the elongation at break is 21.8%, cross-section shrinkage rate of 32%.