2507超级双相不锈钢中σ相的析出行为  

Precipitation behavior ofσphase in 2507 super duplex stainless steel

作　　者：白青青 张志宏 郑淮北 王英虎 Bai Qingqing;Zhang Zhihong;Zheng Huaibei;Wang Yinghu(Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu Sichuan 610303,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China)

机构地区：[1]成都先进金属材料产业技术研究院有限公司,四川成都610303 [2]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009

出　　处：《金属热处理》2022年第4期108-115,共8页Heat Treatment of Metals

摘　　要：利用扫描电镜、透射电镜、X射线衍射仪、电化学工作站等试验及手段,研究了2507(S32750)超级双相不锈钢经700~1000℃时效不同时间后σ相的析出规律及其对冲击性能和腐蚀性能的影响规律。结果表明:σ相析出速度很快,析出量随时效时间的延长先增加后逐步减少,在850~900℃时效后σ相的析出量最大。σ相的析出严重降低材料的冲击及腐蚀性能,建议时效温度不低于950℃。Precipitation ofσphase in 2507(S32750)super duplex stainless steel aged at 700-1000℃for different time and its influence to impact property and corrosion resistance were studied by means of scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD)and electrochemical workstation.The results show that the precipitation rate ofσphase is very fast in 2507 super duplex stainless steel,and the precipitation amount increases first and then decreases gradually with the extension of aging time.Precipitation ofσphase is the fastest after aging at 850-900℃,which leads to the serious reduction of impact toughness and corrosion resistance of the steel.It is recommended that the aging temperature should not be lower than 950℃.

关 键 词：2507超级双相不锈钢 Σ相 冲击性能 腐蚀性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程]