马宏驰,吴伟,周霄骋,王亮.不同热处理态的304和321奥氏体不锈钢在氯化铵环境中的应力腐蚀行为对比研究[J].表面技术,2018,47(11):126-133.
MA Hong-chi,WU Wei,ZHOU Xiao-cheng,WANG Liang.Comparative Study on Stress Corrosion Cracking Behaviors of 304 and 321 Austenitic Stainless Steels by Different Heat Treatment in NH4Cl Solution[J].Surface Technology,2018,47(11):126-133 |
| 不同热处理态的304和321奥氏体不锈钢在氯化铵环境中的应力腐蚀行为对比研究 |
| Comparative Study on Stress Corrosion Cracking Behaviors of 304 and 321 Austenitic Stainless Steels by Different Heat Treatment in NH4Cl Solution |
| 投稿时间：2018-06-24 修订日期：2018-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.11.019 |
| 中文关键词: 奥氏体不锈钢 氯化铵 应力腐蚀 固溶处理 敏化 |
| 英文关键词:austenitic stainless steel NH4Cl stress corrosion cracking solution treatment sensitization |
| 基金项目:国家材料环境腐蚀平台项目（NECP）和国家自然科学基金（51801011，51671028） |
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| Author | Institution |
| MA Hong-chi | Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
| WU Wei | Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
| ZHOU Xiao-cheng | Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
| WANG Liang | Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| 中文摘要: |
| 目的 对比研究原始、固溶和敏化态的304和321奥氏体不锈钢在模拟加氢催化氯化铵环境中的应力腐蚀（SCC）行为及机理。方法 将304和321奥氏体不锈钢经过热处理制备成固溶和敏化态试样，采用U形弯试样在模拟加氢催化氯化铵环境中浸泡的应力腐蚀试验方法对其进行研究，通过观察U形弯弧顶的腐蚀形貌和开裂时间，并结合腐蚀及裂纹的SEM照片和电化学测试结果进行分析。结果 原始和固溶状态304不锈钢U形弯试样在氯化铵溶液环境中开裂时间为25 d左右，断口形貌分别为穿晶断口和沿晶断口；敏化态试样18 d后发生开裂，断口形貌为穿晶和沿晶的混合断口。原始和固溶态321不锈钢U形弯试样在该环境中经过39 d均无应力腐蚀裂纹；敏化试样经30 d后产生宏观开裂。电化学测试结果显示，不同热处理态的304不锈钢在氯化铵溶液中均具有明显的点蚀敏感性，321不锈钢在该环境中耐点蚀和应力腐蚀的能力优于304不锈钢。结论 不同状态的304不锈钢在高温氯化铵环境中具有较强的应力腐蚀倾向，特别是敏化态试样；321不锈钢在该环境中的应力腐蚀敏感性相对较小，但敏化处理显著增加了其沿晶应力腐蚀倾向，而固溶态试样具有明显的沿晶腐蚀特征。 |
| 英文摘要: |
| The work aims to compare and study the stress corrosion cracking (SCC) behaviors and mechanism of 304 and 321 austenitic stainless steels in original state, solution treatment, sensitization in simulated catalytic hydrogenation NH4Cl-containing environment. 304 and 321 austenitic stainless steels were prepared to solid solution and sensitization specimens by heat treatment and investigated by the stress corrosion test of U-bend specimens immersed in simulated catalytic hydrogenation NH4Cl-containing solution. Based on corrosion morphology on U-bend and cracking time, SEM microscopic analysis and electrochemical measurements of corrosion or crack morphology were employed to conduct analysis. The cracking time for 304 stainless steel U-bend in original and solid solution states was approximately 25 days and the fracture morphology was transgranular and intergranular fracture respectively. The cracking time for sensitized specimen was 18 days and the fracture morphology was the combination of transgranular and intergranular fracture. 321 stainless steel U-bend did not appear stress corrosion crack after 39 days at original and solid solution states, but the sensitized specimen generated macro cracks after 30 days. From the electrochemical test results, 304 stainless steel at different heat treatment states had obvious pitting sensitivity in NH4Cl and the pitting and stress corrosion resistance of 321 stainless steel in such environment was better than that of 304 stainless steel. 304 stainless steel at different states has higher SCC susceptibility in high temperature NH4Cl environment for different heat treatment, especially for sensitized one. In comparison, the SCC susceptibility of 321 stainless steel in such environment is relatively low. However, sensitization treatment greatly enhances its susceptibility to intergranular stress corrosion cracking (IGSCC), while the solid solution specimen has obvious characteristic of intergranular corrosion. |
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