N含量对S32750双相不锈钢中二次奥氏体析出行为的影响  

Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel

作　　者：吴晓涵 宋志刚[1] 何建国 丰涵[1] 郑文杰[1] 朱玉亮[1] Wu Xiaohan;Song Zhigang;He Jianguo;Feng Han;Zheng Wenjie;Zhu Yuliang(Research Institute of Special Steels,Central Iron&Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《特殊钢》2024年第1期18-22,共5页Special Steel

摘　　要：随着行业对双相不锈钢品质及性能要求的提升,二次奥氏体已经成为影响S32750双相不锈钢应用的关键因素之一。二次奥氏体是“温度-冷却速率”共同作用的一种亚稳态产物,与铁素体相呈近K-S或N-W位向关系,且对N有富集作用,可按形貌将其分为针状二次奥氏体和孤岛状二次奥氏体。研究了N含量对二次奥氏体析出行为的影响。通过制备w[N]为0.02%、0.09%和0.17%的试验钢,并借助热模拟及EBSD检测可知,随着N含量增加,二次奥氏体由弯曲羽毛状向板条形针状转变,且奥氏体相的整体比例增加。经计算可知,奥氏体相的析出方式与本征吉布斯自由能相关,即受到成分与试验温度的影响。With the improvement of the quality and performance requirements of duplex stainless steel(DSS)in the indus⁃ittrey,i ss eccoonnsdidaerrye adu asste tnhiete(j oiγn2t)p hroads ubcetc oofm tee monpee roaft uthree kaenyd fcaocotolirnsg a frfaetcetsi,n gw thhiec ha pppelrifcoartmioend o nf eSa3r2 K75-S0 oDrS NS.-W Se ocroinednatartyi oanu srteelna⁃⁃taiuosntsehniipte(w iNthA t)h ea nfedr riistoel apthedas aeu asntedn iatne(enIAri)c hbmy emnot rfpohr oNlo geyle.m Ienn tths is.Speacpoenr,d atrhye aeuffsetcetn iotfe Nc amna bsse fdraivcitdioend oinnt oth ne eperdelcei-psihtaatpioend bTehhearmviaolr-Coaf lcse sciomnudlaartyio na uasntedn EiteB SwDa sd estteucdtiieodn pbryo vperde ptharaitn wg itthe stth est eineclsr ewasieth o fN N c,o nγtent of 0.02%,0.09%and 0.17%.needled 2 evolved from curved feather-shape to-shape with the total proportion of austenite phase increased.The precipitation mode of austenite related to the Gibbs free energy,which was namely affected by elements composition and temperature.

关 键 词：双相不锈钢 二次奥氏体 N含量 析出行为 形核驱动力 

分 类 号：TG142.71[一般工业技术—材料科学与工程]