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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。
The influence of chemical composition and temperature on the δ-ferrite content in T122 steel was studied by Thermocalc thermodynamic calculation. The calculation and the corresponding experimental results show that the chemical composition and the temperature change of the heat treatment have a significant effect on the content of δ-ferrite and the content of chromium decreases, Nitrogen content and carbon content increased, can significantly reduce the δ-ferrite content. In the temperature range from 1 030 to 1 070 ℃, the content of δ-ferrite is the lowest. When the temperature is over 1 200 ℃, the transformation of γ-Fe → γ-Fe + δ-Fe will occur, δ-ferrite steel will produce δ-ferrite.