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T122鐵素體耐熱鋼析出相熱力學模擬計算

Thermodynamic calculation of precipitated phases in T122 ferritic heat resistant steel

  • 摘要: 采用Thermo-Calc熱力學計算軟件,對T122鐵素體耐熱鋼釩含量變化對平衡析出相及A3A4點的影響進行了研究.結果表明,T122鋼的主要平衡析出相為M23C6、MX和Laves相.當釩質量分數在0.15%以下時,將析出極少量的Z相,且其隨著釩含量的增加析出量呈直線下降;當釩質量分數在0.28%以上時,將析出兩種不同的MX相,隨著釩含量的增加MN相的比例下降,而M(C,N)相的比例增加.釩含量的變化對M23C6和Laves相的影響甚小.釩作為封閉奧氏體元素,增加釩含量,鐵素體與奧氏體的轉變區域將變小.

     

    Abstract: The effect of alloying element vanadium on the thermodynamic equilibrium phases and the transformation temperatures A3 and A4 of T122 ferritic heat resistant steel were studied by Thermo-Calc software. The results show that the main precipitated phases in T122 steel are M23C6, MX and Laves phases. When the mass fraction of vanadium is less than 0.15%, a little Z-phase precipitates, and the content of Z-phase linearly decreases with increasing vanadium content. When the mass fraction of vanadium is more than 0.28%, two different types of MX precipitate. With increasing vanadium content, the proportion of MN phase decreases, but the proportion of M(C, N) increases. The effect of vanadium content on M23C6 and Laves phases is extremely limited. As a closed austenite region element, the transformation region between ferrite and austenite becomes small with the increase in vanadium content.

     

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