冷却速率对00Cr25Ni7Mo4N超级双相不锈钢析出相的影响

来源期刊：钢铁2009年第1期

论文作者：王晓峰 陈伟庆 郑宏光

文章页码：63 - 66

关键词：超级双相不锈钢； 冷却速率； CCT曲线； σ相

Key words：super duplex stainless steel； cooling rate； CCT curve； sigma phase

摘    要：利用热膨胀仪测定了00Cr25Ni7Mo4N超级双相不锈钢的CCT曲线,结合金相法、显微硬度法、X射线衍射法分析了冷却速率对00Cr25Ni7Mo4N超级双相不锈钢σ析出相的影响。结果表明,00Cr25Ni7Mo4N双相不锈钢热处理或热加工温度应控制在1 050℃以上;冷却速率越小,σ相析出量越多,显微硬度也越高;钢在冷却过程中要以大于4 800℃/h的冷却速率通过600~1 000℃区域,从而避免σ脆性相的析出。

Abstract: The CCT curve of 00Cr25Ni7Mo4N super duplex stainless steel was obtained by thermal dilatometry,and the influence of cooling rate on precipitated sigma phase was studied by combining with metallographic observation,micro hardness measurement and XRD.The results show that the temperature of heat treatment and hot working should be controlled above 1050 ℃.The less the cooling rate,the more the content of precipitated sigma phase,and the higher the micro hardness.The cooling rate over 4800 ℃/h in the range of 600-1000 ℃ should be ensured to avoid the hot brittle sigma phase.