T122耐热钢平衡相转变的热力学计算和分析  

Thermodynamic Calculation and Analysis on Equilibrium Phases Transition in T122 Heat-Resistant Steel

作　　者：曹金荣[1] 刘正东[2] 程世长[2] 杨钢[2] 谢建新[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《特殊钢》2005年第6期16-19,共4页Special Steel

基　　金：国家高技术发展计划(863项目)资助项目(AA2003331060)

摘　　要：采用Thermo-Calc热力学计算软件,对820～1 200 ℃时T122高铬耐热钢(%:0.11～0.12C,11.37～11.97Cr,1.90～1.93W,0.38Mo,0.86～0.90Cu,0.05Nb,0.19～0.20V,0.58～0.67N,0.002 3～0.002 8B)在820～1 200 ℃的热力学平衡相及合金元素Cr、Al、Ti对δ铁素体和主要析出相的影响进行了研究.结果表明,T122耐热钢残留有较多的δ铁素体,其主要析出相为M23C6、Laves和MX.在950～1 050 ℃时δ铁素体最少,其含量为15.7%～18.9%.M23C6析出开始温度为940 ℃,Laves相为750 ℃,MX则较稳定为＞1 250 ℃.Cr对δ铁素体含量影响很大,但对析出相影响较小.降低Al、Ti有助于降低δ铁素体含量,增加MX含量.The thermodynamic equilibrium phases in T122 heat-resistant steel （0.11 ～ 0.12C, 11.37 ～11.97Cr, 1.90～1.93W, 0.38Mo, 0.86～0.90Cu, 0.05Nb, 0.19～0.20V, 0.58～0.67N, 0.0023～0.0028B） and the effect of alloying element Cr, Al, Ti on δ ferrite and major precipitated phases at temperature between 820℃ and 1200℃ have been studied by Thermo-Calc software. The results show that there is a large amount of δ ferrite in T122 heat-resistant steel and the main precipitated phases in steel are M23C6, Laves phase and MX. At temperature between 950℃ and 1050℃ the amount of δ phase is lowest, of which the content is 15.7% ～ 18.9%. The initial precipitated temperature for M23C6 is 940℃, for Laves phase is 750℃, but for MX is more than 1250℃ which is a very stable phase. It is found that chromium has a great influence on formation of δ ferrite and has minor influence on that of precipitated phases; to lower Al and Ti content is available to decrease δ ferrite amount and increase MX phase amount.

关 键 词：T122高铬耐热钢 THERMO-CALC软件 Δ铁素体 析出相 热力学计算 耐热钢 平衡相 相转变 铁素体含量 LAVES相 

分 类 号：TG111[金属学及工艺—物理冶金]