金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 141-147.DOI: 10.13251/j.issn.0254-6051.2022.08.023

• 工艺研究 • 上一篇    下一篇

固溶温度及时间对高氮不锈钢耐蚀性能的影响

张存帅1,2, 刘吉猛1,2, 李皓1,2, 赵定国1,2, 王书桓2, 倪国龙1,2   

  1. 1.华北理工大学 冶金与能源学院, 河北 唐山 063210;
    2.唐山市特种冶金及材料制备重点实验室, 河北 唐山 063210
  • 收稿日期:2022-03-15 修回日期:2022-06-02 出版日期:2022-08-25 发布日期:2022-09-19
  • 通讯作者: 刘吉猛,讲师,博士,E-mail:1094147789@qq.com
  • 作者简介:张存帅(1997—),男,硕士研究生,主要研究方向为高强耐蚀海工用钢,E-mail:2621782676@qq.com。
  • 基金资助:
    河北省科技计划(20311003D);国家自然科学基金(51774139);河北省自然科学基金(E2020209014);河北省自然科学基金重点项目(E2019209597)

Effect of solution treatment temperature and time on corrosion resistance of high nitrogen stainless steel

Zhang Cunshuai1,2, Liu Jimeng1,2, Li Hao1,2, Zhao Dingguo1,2, Wang Shuhuan2, Ni Guolong1,2   

  1. 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China;
    2. Tangshan Key Laboratory of Special Metallurgy and Materials Preparation, Tangshan Hebei 063210, China
  • Received:2022-03-15 Revised:2022-06-02 Online:2022-08-25 Published:2022-09-19

摘要: 使用真空感应炉+电渣重熔炉在0.08 MPa下制备了氮含量0.54%的高氮无镍奥氏体不锈钢,热轧后分别在800、900、1000、1100、1200 ℃下保温不同时间,研究在不同固溶工艺下试验钢的显微组织和耐蚀性。采用动电位极化曲线研究不同固溶工艺下高氮不锈钢在3.5%NaCl溶液中的耐蚀性能,并在6%FeCl3溶液中浸泡8 d后计算其质量损失率和腐蚀速率。结果表明,固溶对高氮不锈钢组织及耐蚀性能的影响很大,经1000、1100 ℃热处理后的试验钢为单一的奥氏体组织;未经热处理和经800、900 ℃热处理的试验钢组织中存在析出相Cr2N;经1200 ℃热处理的试验钢从奥氏体中析出了铁素体组织;1100 ℃下保温1 h的试验钢耐蚀性最好,腐蚀速率仅为1.35×10-5 g·cm-2·h-1;800 ℃保温3 h后试验钢的耐蚀性最差,腐蚀速率高达8.18×10-4 g·cm-2·h-1;而316L不锈钢的耐蚀性能介于两者之间,腐蚀速率为1.24×10-4 g·cm-2·h-1

关键词: 高氮奥氏体不锈钢, 热处理, 极化曲线, 腐蚀速率

Abstract: High nitrogen nickel-free austenitic stainless steel with 0.54%N was prepared by vacuum induction furnace+electroslag remelting furnace under 0.08 MPa. After hot rolling, the tested steel was solution treated at 800, 900, 1000, 1100 and 1200 ℃ for different time, respectively. The microstructure and corrosion resistance of the tested steel were studied with different solution treatment processes, in which the corrosion resistance was studied in 3.5% NaCl solution by potentiodynamic polarization curve, and the mass loss ratio and corrosion rate were calculated after soaking in 6% FeCl3 solution for 8 days. The results show that solution treatment has a great influence on microstructure and corrosion resistance of the high nitrogen stainless steel. The tested steel after solution treatment at 1000 ℃ and 1100 ℃ has a single austenite structure. The precipitation phase Cr2N exists in the microstructure of the tested steel without heat treatment and in that solution treated at 800 ℃ and 900 ℃. In the tested steel solution treated at 1200 ℃, the ferrite structure is precipitated from the austenite. The tested steel heated at 1100 ℃ for 1 h has the best corrosion resistance, and the corrosion rate is only 1.35×10-5 g·cm-2·h-1. While the corrosion resistance of the tested steel heated at 800 ℃ for 3 h is the worst, the corrosion rate is as high as 8.18×10-4 g·cm-2·h-1. The corrosion resistance of 316L stainless steel is somewhere in between, and the corrosion rate is 1.24×10-4 g·cm-2·h-1.

Key words: high nitrogen austenitic stainless steel, heat treatment, polarization curve, corrosion rate

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