Ce对00Cr17高纯铁素体不锈钢热塑性的影响  

Effect of Ce addition on hot ductility of 00Cr17 high-purity ferrite stainless steel

作　　者：张辉[1] 崔文芳[1] 王建军[1] 刘春明[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《材料热处理学报》2011年第1期61-66,共6页Transactions of Materials and Heat Treatment

基　　金：辽宁省科技攻关计划项目(2007221007);长江学者和创新团队发展计划资助项目(IRT0713)

摘　　要：利用Gleeble-2000热模拟试验机研究了不同Ce含量的00Cr17高纯铁素体不锈钢的热变形行为,并利用光学显微镜、扫描电镜和透射电镜对实验钢在不同温度下的显微组织进行了观察和分析。结果表明:在00Cr17高纯铁素体不锈钢中添加稀土Ce完全抑制了900～1050℃的中温脆性区的产生,改善了1350℃以上的高温脆性区内的热塑性。Ce抑制中温脆性区产生的主要原因是Ce抑制了Cr23C6在晶界上的析出,而改善高温脆性区的热塑性是因为Ce减少了硫、磷等低熔点杂质在晶界的富集,抑制了高温时部分晶界优先熔化而造成的开裂。Effect of Ce on hot ductility of 00Cr17 high-purity ferrite stainless steel was investigated by means of thermal simulation on a Gleeble-2000 thermomechanical simulator,optical microscopy,scanning electron microscopy and transmission electron microscopy.The results show that addition of Ce to 00Cr17 steel completely restrains the intermediate temperature brittlement at 900-1050 ℃,which is mainly attributed to the inhibition of precipitation of Cr23 C6 at grain boundaries by addition of Ce.Addition of Ce also improvs the hot ductility at the high temperature higher than 1350 ℃,which is mainly attributed to that addition of Ce deceases the segregation of low melting point impurities such as P and S at grain boundaries and restrains the intergranular cracking caused by the preferential melting of partial grain boundaries.

关 键 词：00Cr17铁素体不锈钢 CE 热塑性 断面收缩率 

分 类 号：TG142.7[一般工业技术—材料科学与工程]