摘要
基于Thermo-Calc热力学模拟软件、光学显微镜、扫描电镜、能谱仪、拉伸试验机等,对Inconel 625合金进行了组织与性能的模拟计算和高通量试验,研究了Inconel 625合金铸态、轧态及热处理态试样的显微组织、力学性能与耐蚀性。结果表明,Inconel 625合金的铸态显微组织为树枝晶,枝晶间可见Ni_(3)Nb相分布及明显的Mo、Nb成分偏析。铸态、热轧态、调质态及固溶态Inconel 625合金的微观组织基本一致,均为γ基体与Ni_(3)Nb相构成的混合组织,主要区别在于Ni_(3)Nb相的含量。成分偏析对合金的耐蚀性影响显著。经3种轧前热处理方式对比,轧前1250℃保温3 h即可获得较好的成分均匀化效果。对比3种轧后热处理方式,调质能获得较好的强度-塑性-耐蚀性的综合匹配。推荐21.5Cr-9Mo-3.65Nb为生产Inconel 625/X65复合板的Inconel 625合金参考成分。
Based on Thermo-Calc thermodynamic simulation software,optical microscope,scanning electron microscope,energy dispersive spectrometer,tensile testing machine,etc.,the microstructure and properties of the Inconel 625 alloy were simulated and subjected to high-throughput experiment.The microstructure,mechanical properties,and corrosion resistance of the Inconel 625 alloy as-cast,hot rolled,and heat treated specimens were studied.The results indicate that the as-cast microstructure of the Inconel 625 alloy is dendritic,with visible distribution of Ni_(3)Nb phase and significant segregation of Mo and Nb elements between dendrites.The microstructure of the Inconel 625 alloy as-cast,hot rolled,quenched and tempered,and solution treated is basically the same,consisting of a mixed structure ofγmatrix and Ni_(3)Nb phase,with the main difference being the content of Ni_(3)Nb phase.The segregation of components has a significant impact on the corrosion resistance of alloy.After comparing three heat treatment methods before hot rolling,it is found that a better homogenization effect can be achieved by holding at 1250℃for 3 h before rolling.Comparing three post rolling heat treatment methods,quenching and tempering can achieve a better comprehensive matching of strength,plasticity,and corrosion resistance.The composition of 21.5Cr-9Mo-3.65Nb is recommended as the Inconel 625 alloy reference composition for producing Inconel 625/X65 composite plate.
作者
刘文月
李天怡
巩俐
任毅
杨博威
安涛
Liu Wenyue;Li Tianyi;Gong Li;Ren Yi;Yang Bowei;An Tao(State Key Laboratory of Metallic Materials for Marine Equipment and Applications,Anshan Liaoning 114009,China;Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;Angang Steel Co.,Ltd.,Anshan Liaoning 114021,China)
出处
《金属热处理》
北大核心
2025年第8期169-176,共8页
Heat Treatment of Metals
