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采用光学显微镜、扫描电镜(SEM)、维氏硬度计、拉伸试验机、热膨胀仪等手段,分别研究了Ti、Nb、Mo、Cr对热轧Fe-36Ni因瓦合金显微组织、碳化物析出相特征、力学性能和热膨胀性能的影响。发现Ti和Mo的碳化物容易以圆形颗粒形式析出,Nb和Cr的碳化物则以短棒状形式析出。碳化物析出相的存在状态以及物理性质显著影响因瓦合金的力学性能和热膨胀性能,其中,Mo合金化的因瓦合金具有最高的抗拉强度,而Cr合金化的因瓦合金则具有最大的热膨胀系数。
The effects of Ti, Nb, Mo and Cr on the microstructure of hot-rolled Fe-36Ni Invar alloy, the carbides Precipitation phase characteristics, mechanical properties and thermal expansion properties. It is found that the carbides of Ti and Mo easily precipitate in the form of round particles and the carbides of Nb and Cr precipitate in the form of short rods. The presence and physical properties of the carbide precipitated phase significantly affect the mechanical properties and thermal expansion properties of the Invar alloy. Among them, the Invar alloy with Mo alloying has the highest tensile strength, while the Cr alloying Invar alloy has the largest Thermal expansion coefficient.