表面划伤对<strong>690TT</strong>合金传热管腐蚀行为的影响

doi:10.11901/1005.3093.2021.001

材料研究学报

2021, Vol. 35

Issue (11): 827-834 DOI: 10.11901/1005.3093.2021.001

研究论文

本期目录 | 过刊浏览

表面划伤对690TT合金传热管腐蚀行为的影响

孟凡江¹, 吴斌²^,³, 吕云鹤⁴, 明洪亮²(

), 鲍一晨¹, 王俭秋², 韩恩厚²

^1.上海核工程研究设计院有限公司上海 200233
^2.中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
^3.中国科学技术大学材料科学与工程学院沈阳 110016
^4.生态环境部核与辐射安全中心北京 100082

Effect of Surface Scratch on Corrosion Behavior of Alloy 690TT Heat Exchanger Tubes

MENG Fanjiang¹, WU Bin²^,³, LV Yunhe⁴, MING Hongliang²(

), BAO Yichen¹, WANG Jianqiu², HAN En-Hou²

^1.Shanghai Nuclear Engineering Research & Design Institute Ltd. Co. , Shanghai 200233, China
^2.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^4.Nuclear and Radiation Safety Center, Beijing 100082, China

引用本文:

孟凡江, 吴斌, 吕云鹤, 明洪亮, 鲍一晨, 王俭秋, 韩恩厚. 表面划伤对690TT合金传热管腐蚀行为的影响[J]. 材料研究学报, 2021, 35(11): 827-834.
Fanjiang MENG, Bin WU, Yunhe LV, Hongliang MING, Yichen BAO, Jianqiu WANG, En-Hou HAN. Effect of Surface Scratch on Corrosion Behavior of Alloy 690TT Heat Exchanger Tubes[J]. Chinese Journal of Materials Research, 2021, 35(11): 827-834.

全文: PDF(10633 KB) HTML

摘要:

制备三种表面有不同深度划伤的690TT合金传热管试样并观察划伤导致的微观组织变化，研究了表面划伤对腐蚀、应力腐蚀行为的影响。结果表明：在传热管表面划伤的划伤堤和划伤谷附近出现了严重的塑性变形，并在划伤堤附近产生了大量的滑移台阶和撕裂变形征；划伤深度对不同划伤区域腐蚀产物的形貌、成分和分布等没有明显的影响；随着划伤深度的增大SCC裂纹的数量和长度都呈增加的趋势，说明材料的SCC敏感性增强；划伤产生的滑移台阶、微裂纹等缺陷，易成为SCC裂纹优先萌生位置。

关键词 ：金属材料, 690TT合金, 表面划伤, 微观组织, 应力腐蚀

Abstract：

Three kinds of samples with different scratch depths on the surface of alloy 690TT for heat exchanger tubes are prepared. The microstructure changes caused by scratch and the effect of scratches on the corrosion and SCC behavior were systematically investigated. The results show that severe plastic deformation occurred near the scratch bank and the scratched groove. A large number of sliding steps and tear deformation generated near the scratched bank. The scratch depth had no obvious influence on the morphology, composition and distribution of corrosion products in different areas of scratches. As the scratch depth increased both the number and the length of SCC cracks increased, indicating that the SCC sensitivity of the material increased. Defects such as slip steps and micro cracks produced during the scratching process were likely to be the preferential positions of SCC initiation.

Key words： Metallic materials Alloy 690TT Surface scratch Microstructure SCC

收稿日期: 2021-01-11

ZTFLH:

TG174

基金资助:国家重点研发计划(2019YFB1900900);国家自然科学基金(51771211);中国科学院核用材料与安全评价重点实验室开放课题(2021NMSAKF01)

作者简介: 孟凡江，男，1982年生，高级工程师

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.001 或 https://www.cjmr.org/CN/Y2021/V35/I11/827

表 1 690TT合金的化学成分

图1 690TT合金基体的金相组织

图2 不同深度划伤试样的激光共聚焦测试结果

图3 划伤深度为30 μm、70 μm、110 μm试样的表面形貌

图4 不同深度划伤试样的金相组织

图5 划伤深度为70 μm的试样截面的EBSD结果

图6 划伤深度为30 μm、70 μm、110 μm试样腐蚀2000 h后腐蚀产物的形貌

图7 划伤试样腐蚀2000 h后腐蚀产物的能谱分析

图8 划伤深度为30 μm、70 μm、110 μm试样腐蚀2000 h后截面的形貌

表2 不同划伤深度试样腐蚀2000 h后划伤区截面裂纹的统计结果

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