化学成分和热处理温度对T122耐热钢中δ-铁素体含量的影响

来源期刊：钢铁2009年第12期

论文作者：包汉生 程世长 刘正东 谭舒平

文章页码：74 - 78

关键词：化学成分； 热处理温度； T122耐热钢； δ-铁素体

Key words：chemical composition； heat treatment temperature； T122 heat resistant steel； δ-ferrite

摘    要：采用Thermocalc热力学计算研究了化学成分和温度对T122钢中δ-铁素体含量的影响,计算和相应试验结果表明,化学成分和热处理温度变化对δ-铁素体含量影响显著,铬含量降低,氮含量和碳含量增加,能明显降低δ-铁素体含量。在1 030~1 070℃的温区热处理,δ-铁素体含量最低;超过1 200℃热处理会产生γ-Fe^→γ-Fe+δ-Fe转变,即在低于1 200℃处理不含δ-铁素体的钢中会生成δ-铁素体。

Abstract: With Thermocalc thermodynamic equilibrium phase calculations and experimental analysis,the effect of chemical compositions and heat treatment temperature on δ-ferrite content in T122 heat resistant steels was studied.The results show that chemical compositions and heat treatment temperature affect δ-ferrite content obviously.Decreasing chromium content and increasing nitrogen,carbon content can decrease δ-ferrite content greatly.There is a proper heat treatment temperature zone ranging from 1 030 ℃ to 1 070 ℃,which leads to the lowest δ-ferrite content.When the temperature exceeds 1 200 ℃,the reaction happens,γ-Fe^→γ-Fe +δ-Fe,and δ-ferrite forms in the steel which isn’t contain δ-ferrite treated temperature below 1 200 ℃.