Effects of Shot-peening on Stress Corrosion Behaviors of AISI304 Welding Line in NaCl Aqueous Solution
摘 要
对AISI304不锈钢氩弧焊缝表面进行了喷丸处理,通过光学显微镜和扫描电镜对材料表面及断口的微观组织进行了观察,用X射线应力衍射仪测试了喷丸处理前后试样的残余应力,并进行了在NaCl水溶液中的应力腐蚀试验.结果表明:喷丸处理前,AISI304不锈钢焊缝在NaCl溶液中具有明显的应力腐蚀开裂敏感性,应力腐蚀裂纹断口表现为脆性断裂,属于穿晶型裂纹:喷丸处理后表面获得了组织细化的硬化层,残余压应力有极大提高,有效地降低了不锈钢焊缝的应力腐蚀开裂倾向.
Abstract
The welding line surface of AISI304 stainless steel was processed by shot-peening treatment,the microstructures of the material surface were observed with optical microscope and scanning electron microscope.The residual stresses of the sample by peening treatment were measured with X-ray stress tester, and the stress corrosion experiment in NaCl aqueous solution was processed.The results show that welding line of AISI304 stainless steel has obvious crack sensitivity of stress corrosion in NaCl aqueous solution;the crack is behaved with brittle rupture,which is transgranular crack;the refined hardened-layer is acquired on the welding line surface of AISI304 stainless steel by shot-peening treatment,and the compressive residual stress has greatly increased,which effectively decreases the stainless steel crack in stress corrosion.
中图分类号 TG174144
所属栏目
基金项目 江苏省研究生创新计划资助项目(XM05-32)
收稿日期 2007/1/27
修改稿日期 2007/4/30
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备注张友宏(1965-),男,江苏扬州人,讲师.
引用该论文: ZHANG You-hong. Effects of Shot-peening on Stress Corrosion Behaviors of AISI304 Welding Line in NaCl Aqueous Solution[J]. Materials for mechancial engineering, 2007, 31(11): 20~23
张友宏. 喷丸处理对AISI304钢焊缝在NaCl水溶液中应力腐蚀行为的影响[J]. 机械工程材料, 2007, 31(11): 20~23
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参考文献
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【3】Wahab M A,Sakano M.Experimental study of corrosion fatigue behaviour of welded steel structures[J].Journal of Materials Processing Technology,2001,118:116-121.
【4】李红梅,蔡珣,吕战鹏.304不锈钢在含硼和锂的高温水中的应力腐蚀破裂和表层氧化膜分析[J].材料工程,2004(4):7-10.
【5】严铿,徐济进,蒋成禹.T225NG钛合金在高温高压水介质中应力腐蚀行为的研究[J].稀有金属,2004,28(2):425-427.
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【10】Ting Kuen.The evaluation of intergranular stress corrosion cracking problems of stainless steel piping in Taiwan BWR-6 nuclear power plant[J].Nuclear Engineering and Design,1999,191:245-254.
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