选区激光熔化316L/430双相不锈钢组织和性能胡建斌1)，刘晓静1)，王智勇2)，尚峰2)✉，贺毅强2)，杨建明2)1)连云港东睦新材料有限公司,连云港2220692)江苏海洋大学机械工程学院,连云港222005✉通信作者,E-mail:shangfeng@jou.edu.cn摘要以气雾化316L和430混合粉末为原料，采用选区激光熔化工艺制备了316L/430双相不锈钢。利用光学显微镜、电子材料试验机、电化学工作站研究了选区激光熔化双相不锈钢固溶处理前后的显微组织、力学性能和耐腐蚀性能。结果表明：当固溶温度为1250℃时，铁素体与奥氏体两相面积比为45.7:54.3，此时试样的力学性能较好，抗拉强度830MPa，屈服强度340MPa，硬度HV356，断后伸长率25%；当固溶温度为1150℃时，试样的耐腐蚀性能较好，自腐蚀电流密度为3.196×10−6A·cm−2，点蚀电位为−0.118V。关键词双相不锈钢；选区激光熔化；固溶处理；力学性能；耐腐蚀性能分类号TG142.1Microstructureandpropertiesof316L/430duplexstainlesssteelsprocessedbyselectivelasermeltingHUJianbin1),LIUXiaojing1),WANGZhiyong2),SHANGFeng2)✉,HEYiqiang2),YANGJianming2)1)LYGTMNewMaterialsGroupCo.,Ltd.,Lianyungang222069,China2)SchoolofMechanicalandEngineering,JiangsuOceanUniversity,Lianyungang222005,China✉Correspondingauthor,E-mail:shangfeng@jou.edu.cnABSTRACTThe316L/430duplexstainlesssteelswerepreparedbyselectivelasermeltinginthisstudy,using316Land430mixedpowderspreparedbygasatomizationastherawmaterials.Themicrostructure,mechanicalproperties,andcorrosionresistanceofthe316L/430duplexstainlesssteelsbeforeandaftersolutiontreatmentwereexaminedbyopticalmicroscope,electronicmaterialtestingmachine,andelectrochemicalworkstation.Theresultsindicatethat,asthesolutiontemperatureis1250℃,the316L/430duplexstainlesssteelsspecimensshowthebettercomprehensivemechanicalproperties,thetensilestrength,yieldstrength,elongation,andmicrohardnessare830MPa,340MPa,25%,andHV356,respectively,andthearearatioofferritetoausteniteis45.7:54.3.Whenthesolutiontemperatureis1150℃,thespecimenshavethebettercorrosionresistance,theself-corrosioncurrentdensityandpittingpotentialare3.196×10‒6A/cm2and−0.118V,respectively.KEYWORDSduplexstainlesssteels;selectivelasermelting;...
