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。
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 slid-ing 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.
作者
孟凡江
吴斌
吕云鹤
明洪亮
鲍一晨
王俭秋
韩恩厚
MENG Fanjiang;WU Bin;LV Yunhe;MING Hongliang;BAO Yichen;WANG Jianqiu;HAN En-Hou(Shanghai Nuclear Engineering Research&Design Institute Ltd.Co.,Shanghai 200233,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Nuclear and Radiation Safety Center,Beijing 100082,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2021年第11期827-834,共8页
Chinese Journal of Materials Research
基金
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)。
