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。
The precipitation behavior ofσphase 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 theσphase 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,theσphase content increases rapidly.When the holding time increases to 90-120 min,theσphase content slowly increases.When the holding time is 120-240 min,theσphase 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 theσphase.The strengthening mechanism of theσphase is transformed from the Orowan strengthening mechanism to the high elastic strain energy strengthening mechanism of theσphase.The electrochemical test results of the S32205 duplex stainless steel with differentσphase contents show that as the content of theσphase 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.
作者
王良
彭荟宁
赵攀
胡议文
周培山
郑华林
王斌
WANG Liang;PENG Hui-ning;ZHAO Pan;HU Yi-wen;ZHOU Pei-shan;ZHENG Hua-lin;WANG Bin(School of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Patent Examination Cooperation Sichuan Center of the Patent Office,Chengdu 610500,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2024年第4期113-121,共9页
Transactions of Materials and Heat Treatment
基金
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计划(S202310615167)。
关键词
S32205双相不锈钢
Σ相
显微组织
力学性能
耐蚀性
S32205 duplex stainless steel
σphase
microstructure
mechanical property
corrosion resistance