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基于Thermo-Calc热力学计算软件,研究了600℃、650℃时马氏体耐热不锈钢中Cr、W、Mo合金元素含量变化对析出相的影响。计算结果表明:钢中析出相主要为M_(23)C_6、金属间化合物Laves相和σ相。温度和合金元素Cr、W、Mo含量变化对M_(23)C_6碳化物析出影响较小,对Laves相和σ相的析出影响较大,W、Mo含量在一定范围内变化时会析出CHI相。随Cr含量增加,Laves相析出量先保持不变,但当σ相开始析出后线性减少。温度和W含量变化对σ相析出量影响较大。随Mo含量增加,Laves相析出量线性增加;600℃时当σ相开始析出后,Laves相析出量缓慢增加;650℃时无σ相析出,但当CHI相大量析出后,Laves相析出量急剧减少。
Based on Thermo-Calc thermodynamic calculation software, the influence of the contents of Cr, W and Mo alloying elements in the martensitic stainless steel at 600 ℃ and 650 ℃ on the precipitation phase was studied. The calculated results show that the precipitates in the steel are mainly M_ (23) C_6, intermetallic compounds Laves phase and σ phase. The changes of temperature and alloying elements Cr, W and Mo have little effect on the precipitation of M_ (23) C_6 carbides, and have a great influence on the precipitation of Laves phase and σ phase. When the content of W and Mo changes within a certain range, CHI phase . With the increase of Cr content, the amount of Laves phase precipitation first maintained unchanged, but when the σ phase precipitation began to decrease linearly. The changes of temperature and W content have a great influence on the amount of σ phase precipitation. With the increase of Mo content, the amount of Laves phase precipitates increases linearly; when the σ phase begins to precipitate at 600 ℃, the amount of Laves phase precipitates slowly and no σ phase precipitates at 650 ℃. cut back.