摘要
采用光学显微镜、扫描电镜、拉伸试验机和电化学工作站等,研究了固溶温度对00Cr25Ni7Mo4N双相不锈钢显微组织、力学性能和耐腐蚀性能的影响。结果表明,热轧和固溶温度为1025~1200℃时双相钢的显微组织都为铁素体+奥氏体双相组织,随着固溶温度升高,双相钢中α相含量不断增大,γ相含量不断减小,在固溶温度为1175℃时,双相钢中α∶γ相比例接近于1∶1;相较于热轧态双相钢,不同温度固溶处理后,双相钢的抗拉强度、规定塑性延伸强度和洛氏硬度有不同程度减小,而断后伸长率、断面收缩率和冲击吸收能量有不同程度增加;在固溶温度为1175℃时,双相钢的抗拉强度和规定塑性延伸强度较高,而断后伸长率、断面收缩率和冲击吸收能量都达到最大值。当固溶温度为1175℃时,双相钢的腐蚀电位最大、腐蚀电流密度最小,容抗弧半径和钝化膜电阻最大,弥散系数最接近于1,具有最佳的耐蚀性能。
The effect of solution treatment temperature on the microstructure,mechanical properties and corrosion resistance of 00Cr25Ni7Mo4N duplex stainless steel studied by means of optical microscope,scanning electron microscope,tensile testing machine and electrochemical workstation.The results show that the microstructure of the steel is ferrite(α)+austenite(γ)when the hot-rolling and solution treatment temperatures are 1025-1200℃.With the increase of solution treatment temperature,the content ofαphase in the steel increases and the content ofγphase decreases;at the solution treatment temperature of 1175℃,the ratio ofα∶γin the steel is close to 1∶1.Compared with the hot-rolled steel,after solution treatment at different temperatures,the tensile strength,yield strength and Rockwell hardness of the steel decrease in varying degrees,while the elongation after fracture,reduction of area and impact absorbed energy increase in varying degrees.When solution treated at 1175℃,the tensile strength and yield strength of the steel are higher,while the elongation after fracture,reduction of area and impact absorbed energy all reach their maximum values.Also when solution treated at 1175℃,the corrosion potential of the steel is the most positive,the corrosion current density is the smallest,the capacitive arc radius and passive film resistance are the largest,and the dispersion coefficient is the closest to 1,so the steel has the best corrosion resistance.
作者
张学元
刘骏
Zhang Xueyuan;Liu Jun(School of Architecture and Civil Engineering,Qiqihar University,Qiqihar Heilongjiang 161006,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin Heilongjiang 150001,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第7期150-155,共6页
Heat Treatment of Metals
基金
黑龙江省教育厅基本科研业务专项(135209232)
齐齐哈尔市科学技术计划(GYGG-201608)
齐齐哈尔大学教育科学研究项目(2017115)
关键词
00Cr25Ni7Mo4N双相不锈钢
固溶温度
组织
力学性能
腐蚀性能
00Cr25Ni7Mo4N duplex stainless steel
solution treatment temperature
microstructure
mechanical properties
corrosion resistance
