摘要
利用XSL-4-12箱式热处理炉、ZEISS金相显微镜、HRS-150数显洛氏硬度计及拉伸试验机研究了固溶处理对Cr23Ni7Mo2Cu0.6双相不锈钢组织与性能的影响。结果表明,铁素体含量随着固溶温度的升高而增加,在930~960℃之间铁素体与奥氏体面积比达到1∶1,σ相的含量随着固溶温度的升高而逐渐减少,在960℃时仅有少量σ相存在于相界处,1020℃时由于锻造造成的奥氏体相分布不均的情况也得到了改善。合金硬度与抗拉强度随着固溶温度的上升呈现先下降后上升的趋势,分别在1020℃和1050℃达到最小值94.4 HRB和547 MPa,伸长率则随着固溶温度的升高呈现先上升后下降的趋势,在990℃时达到峰值41.5%。综合钢丝拉拔变形过程中材料的硬度、塑韧性及组织均匀性对材料成形性能的影响,Cr23Ni7Mo2Cu0.6双相不锈钢的固溶温度宜选择1020℃。
Effect of solution treatment on microstructure and properties of Cr23 Ni7 Mo2 Cu0.6 duplex stainless steel was studied by XSL-4-12 box heat treatment furnace, Zeiss metallographic microscope, HRS-150 digital Rockwell hardness tester and tensile test machine. The results show that the content of ferrite increases with the increase of solution temperature, and the area ratio of ferrite to austenite reaches 1∶1 between 930 ℃ and 960 ℃. The content of σ phase decreases with the increase of solution temperature, only a small amount of σ phase exists at phase boundary at 960 ℃, and the uneven distribution of austenite phase due to forging at 1020 ℃ is also improved. The hardness and tensile strength of the alloy decrease at first and then increase with the increase of solution temperature, reaching the minimum values of 94.4 HRB at 1020 ℃ and 547 MPa at 1050 ℃, respectively. The elongation increases at first and then decreases with the increase of solution temperature, reaching a peak value of 41.5% at 990 ℃. Considering the effects of hardness, plasticity, toughness and microstructure uniformity of the material on formability of the material during drawing and deformation of the steel wire, the optimal solution temperature of the Cr23 Ni7 Mo2 Cu0.6 duplex stainless steel is 1020 ℃.
作者
陈佳俊
朱治愿
李建强
王守乾
Chen Jiajun;Zhu Zhiyuan;Li Jianqiang;Wang Shouqian(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第6期59-64,共6页
Heat Treatment of Metals
基金
江苏省重点研发计划(BE2017143)。
