热处理对2205双相不锈钢显微组织及性能的影响
Effect of heat treatment on microstructure and properties of 2205 duplex stainless steel
王良 1杨茗凯 2胡议文 3周培山 2郑华林 4王斌2
作者信息
- 1. 西南石油大学新能源与材料学院,四川 成都 610500;西南石油大学机电工程学院,四川 成都 610500
- 2. 西南石油大学新能源与材料学院,四川 成都 610500
- 3. 国家知识产权局专利局专利审查协作四川中心,四川 成都 610213
- 4. 西南石油大学机电工程学院,四川 成都 610500
- 折叠
摘要
采用光学显微镜、显微硬度计和电化学工作站等研究了 2205 双相不锈钢经不同温度保温不同时间后的显微组织及性能,并分析了其经不同工艺热处理后的γ和α两相比例和析出相的变化.结果表明:2205 双相不锈钢初始状态下α和γ相含量分别为 41.2%和 58.8%.保温时间相同时,随着热处理温度的升高,γ相含量减少,σ相含量先增加后减少,硬度增加,腐蚀电位先降低后增加.保温温度相同时,随着保温时间的延长(0.5～2 h),γ相和σ相含量增加,γ相含量增幅为 2.43%～3.87%,σ相含量增幅为 0.05%～0.08%,晶粒有长大趋势,硬度逐渐降低,腐蚀电位总体呈降低趋势.当加热温度为 950 和 1000℃时,硬度随保温时间增加而降低的幅度较明显.σ相含量及α/γ比例增加是造成 2205 双相不锈钢耐腐蚀性能下降的主要原因.
Abstract
Microstructure and properties of 2205 duplex stainless steel after holding at different temperatures for different time were studied by means of optical microscope,microhardness tester and electrochemical workstation,and the changes in the ratio of γ and α phases and precipitates of the experimental steel after different heat treatments were analyzed.The results show that the initial content of α and γ phases in the 2205 duplex stainless steel is 41.2%and 58.8%,respectively.When the holding time is the same,as the heat treatment temperature increases,the content of γ phase decreases,the content of σ phase first increases and then decreases,the hardness increases,and the corrosion potential first decreases and then increases.When the holding temperature is the same,as the holding time increases from 0.5-2 h,the content of γ phase and σ phase increases,with an increment of 2.43%to 3.87%for γ phase and 0.05%to 0.08%for σ phase,the grain size tends to grow,the hardness gradually decreases,and the corrosion potential generally decreases.When the heating temperature is 950℃ and 1000℃,the decrease in hardness is more significant with increasing holding time.The increase in α phase content and α/γ ratio is the main reason for the decrease in corrosion resistance of the 2205 duplex stainless steel.
关键词
2205双相不锈钢/热处理/显微组织/硬度/耐蚀性Key words
2205 duplex stainless steel/heat treatment/microstructure/hardness/corrosion resistance引用本文复制引用
基金项目
南充市-西南石油大学市校科技战略合作专项(23XNSYSX0003)
西南石油大学课外开放实验项目(2022KSZ05023)
出版年
2024
NETL
NSTL
万方数据