σ相对S32205双相不锈钢力学性能和耐蚀性的影响
Effect of σ phase on mechanical properties and corrosion resistance of S32205 duplex stainless steel
王良 1彭荟宁 2赵攀 2胡议文 3周培山 2郑华林 4王斌2
作者信息
- 1. 西南石油大学机电工程学院,四川成都 610500;西南石油大学新能源与材料学院,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 610500
- 4. 西南石油大学机电工程学院,四川成都 610500
- 折叠
摘要
通过JMatPro软件模拟计算和试验结合的方式研究了S32205双相不锈钢中σ相的析出行为及对其力学性能和耐蚀性的影响.结果表明:通过JMatPro软件模拟计算得到的S32205双相不锈钢σ相析出鼻尖温度为875 ℃.当S32205双相不锈钢在875℃保温0～90 min,σ相含量快速增加,当保温时间增加至90～120 min时,σ相含量缓慢上升,而当保温时间为120～240 min时σ相含量达到饱和,最大为6.1％,与模拟计算结果基本符合.随着保温时间逐渐增加,S32205双相不锈钢的屈服强度、抗拉强度及显微硬度先快速增加后逐渐保持稳定,而伸长率呈下降趋势,强度和硬度与σ相体积含量成正比关系,σ相强化机理由Orowan强化机制转变为σ相的高弹性应变能强化机制.不同σ含量的S32205双相不锈钢的电化学试验结果表明随着σ相的含量逐渐增多,基体越容易贫Cr,S32205双相不锈钢越容易产生腐蚀,耐蚀性逐渐降低.
Abstract
The precipitation behavior of σ phase in S32205 duplex stainless steel and its effect on mechanical properties and corrosion resistance of the steel were studied through a combination of JMatPro software simulation calculation and experiments.The results show that the precipitation nose temperature of the σ phase in the S32205 duplex stainless steel obtained through JMatPro software simulation calculation is 875 ℃.When S32205 duplex stainless steel is held at 875 ℃ for 0-90 min,the σ phase content increases rapidly.When the holding time increases to 90-120 min,the σ phase content slowly increases.When the holding time is 120-240 min,the σ phase content reaches saturation,with a maximum of 6.1％,which is basically consistent with the simulation calculation results.As the holding time gradually increases,the yield strength,tensile strength and microhardness of the S32205 duplex stainless steel first rapidly increase and then gradually maintain stability,while the elongation shows a decreasing trend.The strength and hardness are proportional to the volume content of the σ phase.The strengthening mechanism of the σ phase is transformed from the Orowan strengthening mechanism to the high elastic strain energy strengthening mechanism of the σ phase.The electrochemical test results of the S32205 duplex stainless steel with different u phase contents show that as the content of the σ phase gradually increases,the matrix is more prone to Cr-depleted,and the S32205 duplex stainless steel is more prone to corrosion,resulting in a gradual decrease in corrosion resistance.
关键词
S32205双相不锈钢/σ相/显微组织/力学性能/耐蚀性Key words
S32205 duplex stainless steel/σ phase/microstructure/mechanical property/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)
四川省大学生创新创业训练计划(S202310615167)
出版年
2024
NETL
NSTL
万方数据