| 柴油机不锈钢散热管焊缝早期开裂原因分析 |
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| 引用本文： | 童建华,张恩霞,于治水. 柴油机不锈钢散热管焊缝早期开裂原因分析[J]. 机械工程材料, 2009, 0(10) |
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| 作者姓名： | 童建华 张恩霞 于治水 |
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| 作者单位： | 上海工程技术大学材料工程学院,上海,201620;上海工程技术大学材料工程学院,上海,201620;上海工程技术大学材料工程学院,上海,201620 |
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| 基金项目： | 上海市重点学科建设资助项目(J51402) |
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| 摘 要： | 某柴油机散热用奥氏体不锈钢焊接弯管焊缝发生早期开裂,采用宏观分析、金相分析、扫描电镜及能谱分析、化学成分分析等对弯管开裂的原因进行了分析。结果表明:焊缝的早期开裂属应力腐蚀开裂,其早期失效主要是由于焊接工艺及焊丝选择不当所致,冷却水中氯离子的存在造成接头强度下降、耐蚀性能降低,形成裂纹源,裂纹在应力作用下迅速扩展导致开裂。
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| 关 键 词： | 不锈钢管 焊缝开裂 未焊透 应力腐蚀开裂 |
Early Cracking Failure Analysis of the Welded Seam for Stainless Steel Radiating Pipe in a Diesel Engine |
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| TONG Jian-hua,ZHANG En-xia,YU Zhi-shui. Early Cracking Failure Analysis of the Welded Seam for Stainless Steel Radiating Pipe in a Diesel Engine[J]. Materials For Mechanical Engineering, 2009, 0(10) |
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| Authors: | TONG Jian-hua ZHANG En-xia YU Zhi-shui |
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| Affiliation: | TONG Jian-hua,ZHANG En-xia,YU Zhi-shui(College of Material Engineering,Shanghai University of Engineering Science,Shanghai 201620,China) |
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| Abstract: | Macro-analysis,metallographic analysis,scanning electron microscopy(SEM),energy dispersive X-ray analysis(EDAX) and chemical composition analysis were adopted to study the reason for early cracking failure of the welded seam for stainless steel radiating pipe in a diesel engine.The results show that the early cracking caused by stress corrosion.The early failure was mainly attributed to improper welding technique and inappropriate welding electrode,which formed the crack source because of decreased strength... |
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| Keywords: | stainless steel pipe welded seam cracking lack of penetration SCC |
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