冷却速率对00Cr25Ni7Mo4N超级双相不锈钢析出相的影响  

Influence of Cooling Rate on Precipitated Phase of Super Duplex Stainless Steel

作　　者：王晓峰[1] 陈伟庆[1] 郑宏光[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]宝钢研究院不锈钢技术中心,上海201900

出　　处：《钢铁》2009年第1期63-66,共4页Iron and Steel

摘　　要：利用热膨胀仪测定了00Cr25NiTMo4N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00Cr25NiTMo4N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1050℃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4800℃／h的冷却速率通过600-1000℃区域，从而避免σ脆性相的析出。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 4 800℃/h in the range of 600-1000 ℃ should be ensured to avoid the hot brittle sigma phase.

关 键 词：超级双相不锈钢 冷却速率 CCT曲线 Σ相 

分 类 号：TG142.71[一般工业技术—材料科学与工程]