摘要
利用OM、SEM、EDS、万能材料试验机及电化学等方法研究了固溶温度对2304双相不锈钢组织、力学及耐腐蚀性能的影响。结果表明,固溶温度从1020℃升高到1100℃,奥氏体含量减少,固溶温度在1060~1100℃之间,奥氏体向铁素体转变速度增大。当固溶温度提高到1080℃时,铁素体含量增多、奥氏体中Cr元素含量增加、Ni元素含量的降低以及形貌钝化使得材料抗拉强度增强,具有最大抗拉强度值590 MPa;固溶温度进一步提高到1100℃时,材料中两相化学成分差异最小、奥氏体分布会致其抗拉强度下降。材料耐腐蚀性能随温度变化规律与抗拉强度相同,固溶温度为1080℃时,具有最小腐蚀电流密度5.28μA·cm^-2、最大电荷转移电阻4.89×105Ω,表现出最佳耐腐蚀性能。
Effect of solution treatment temperature on microstructure,mechanical properties and corrosion resistances of 2304 duplex stainless steel have been investigated by means of OM,SEM,EDS,universal testing machine and electrochemical workstation.The results reveal that with the increase of solution treatment temperature from 1020℃to 1100℃,the amount of austenite in the steel decreases.The transformation rate of austenite to ferrite increases after solution treatment,when the temperature rises from 1060℃to 1100℃.When the solution treatment temperature increases to 1080℃,the content of Cr increases and the content of Ni decreases,the decrease of Ni content and the passivation of the appearance enhance the tensile strength of the steel to reach the maximum of 590 MPa.To further increase the solution treatment temperature to 1100℃,the difference of chemical composition between two phases of the steel is the smallest,and the austenite distribution will lead to the decrease of tensile strength.The change trend of corrosion resistance with temperature is the same as the tensile strength.The corrosion current density of the samples reaches the minimum of 5.28μA·cm^-2 and the charge transfer resistance reaches the maximum of 4.89×105Ωwhen the solid solution treatment is 1080℃,exhibiting the best corrosion resistance.
作者
卢金珠
向红亮
张伟
詹土生
邓丽萍
Lu Jinzhu;Xiang Hongliang;Zhang Wei;Zhan Tusheng;Deng Liping(School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou Fujian 350108,China;Jinjiang Science and Education Park of Fuzhou University,Jinjiang Fujian 362200,China;Technical Center for Stainless Steel Baosteel Co.,Ltd.,Baoshan Shanghai 201900,China;Baosteel Desheng Stainless Steel Co.,Ltd.,Luoyuan Fujian 350601,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第12期125-132,共8页
Heat Treatment of Metals
基金
国家自然科学基金(51601039)
福建省科技重大专项(2017HZ0001-2)
福建省2016年产业技术联合创新专项(FG-2016001)
上海市青年科技启明星计划(17QB1400100)
关键词
2304双相不锈钢
奥氏体
固溶温度
耐腐蚀性能
力学性能
duplex stainless steel 2304
austenite
solution treatment temperature
corrosion resistance
mechanical properties
