Abstract：TThe equilibrium precipitation phases and the process of solidification for 0Cr15Ni70Ti3AlNb alloy were studied with the help of Thermo-Calc software. The main precipitation phases includeγ,γ′,MC,M23C6. Positive segregation of Ti,Nb and negative segregation of Cr,Fe,Si may occur during solidification according to the calculation. The contents of Al and Ti have a significant influence on the precipitation temperature and the maximum mass fraction of γ′phase. C is the main control element of the precipitation temperature and the maximum mass fraction of MC. Mass fraction and precipitation temperature of M23C6 are controlled by C and Cr respectively. The optimal composition was found to be C(0.03~0.05%)-Al(0.7~0.9%)-Ti(2~2.25%)-Nb(0.75~0.95%)-Cr(13.5~15.5%).Research results can help to understand and instruct composition design and heat treatment process development better.
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2020, Vol. 27 