| 固溶温度及时间对高氮不锈钢耐蚀性能的影响 |
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| 引用本文： | 张存帅,刘吉猛,李皓,赵定国,王书桓,倪国龙. 固溶温度及时间对高氮不锈钢耐蚀性能的影响[J]. 金属热处理, 2022, 47(8): 141-147. DOI: 10.13251/j.issn.0254-6051.2022.08.023 |
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| 作者姓名： | 张存帅 刘吉猛 李皓 赵定国 王书桓 倪国龙 |
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| 作者单位： | 华北理工大学 冶金与能源学院,河北 唐山 063210;唐山市特种冶金及材料制备重点实验室,河北 唐山 063210;唐山市特种冶金及材料制备重点实验室,河北 唐山 063210 |
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| 基金项目： | 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) |
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| 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。
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| 关 键 词： | 高氮奥氏体不锈钢 热处理 极化曲线 腐蚀速率 |
| 收稿时间： | 2022-03-15 |
Effect of solution treatment temperature and time on corrosion resistance of high nitrogen stainless steel |
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| Zhang Cunshuai,Liu Jimeng,Li Hao,Zhao Dingguo,Wang Shuhuan,Ni Guolong. Effect of solution treatment temperature and time on corrosion resistance of high nitrogen stainless steel[J]. Heat Treatment of Metals, 2022, 47(8): 141-147. DOI: 10.13251/j.issn.0254-6051.2022.08.023 |
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| Authors: | Zhang Cunshuai Liu Jimeng Li Hao Zhao Dingguo Wang Shuhuan Ni Guolong |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | high nitrogen austenitic stainless steel heat treatment polarization curve corrosion rate |
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