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采用超高分辨场发射扫描电镜对一种新型Fe-Ni-Cr基合金进行了组织特征观察,并利用热力学计算软件Thermo-Calc对合金中可能析出的平衡相及元素含量变化对合金熔点及各相析出行为影响进行了计算分析。结果表明,C含量的增加可以明显提高MC及M_(23)C_6的析出量和析出温度;Ti作为MC的主要形成元素,其含量增加对MC析出量基本无影响,但可显著扩大MC的析出温度范围;Al、Ti含量的增加均可提高γ′相的析出量和析出温度,Al的影响尤为显著;降低Al或提高Ti含量均会显著提高η相的析出量和析出温度;W作为参与MC形成的元素,其含量增加对于促进MC形成的作用不明显;合金元素Al、Ti、W含量的增加均会降低初熔点,Al和Ti的影响更为明显。
Ultrahigh resolution field emission scanning electron microscopy (SEM) was used to observe the microstructure of a new Fe-Ni-Cr based alloy. The thermodynamic calculation software Thermo-Calc was used to analyze the equilibrium phases and elemental contents in the alloy, Phase analysis of the impact of conduct calculations. The results show that the increase of C content can significantly increase the amount of MC and M_ (23) C_6 precipitates and the temperature of precipitation. Ti, as the main element of MC, has little effect on the amount of MC precipitated, but can significantly increase the precipitation of MC Temperature range; the increase of Al and Ti content can increase the precipitation amount and precipitation temperature of γ ’phase, and the influence of Al is more remarkable; decrease of Al or increase of Ti content can significantly increase the precipitation amount and precipitation temperature of η phase; The effect of MC content on the formation of MC is not obvious. The increase of alloying elements Al, Ti, W will reduce the initial melting point, and the effect of Al and Ti will be more obvious.