电子束焊乙烯裂解炉管焊缝开裂失效分析
Failure Analysis of Welding Cracking on Ethylene Cracking Tubes by Electron Beam Welding
摘 要
采用金相分析、扫描电镜观察等方法对电子束焊接的乙烯裂解炉管焊缝开裂原因进行了失效分析。结果表明: 裂纹的产生原因是在电子束焊接过程中形成了垂直于焊缝中心的柱状晶交汇线及焊缝中心线处贫铌导致大量碳化物析出, 使焊缝中心明显脆化; 设备停车冷速过快导致产生很大的应力, 造成焊缝中心线处形成裂纹并扩展导致了开裂。
电子束焊
裂纹
ethylene cracking tube
electron beam welding
cracking
Abstract
Failure analysis of welding cracking on ethylene cracking tubes by electron beam welding was carried out by means of metallographic analysis and SEM observation, etc. The results show that the reasons for the cracks formation were those the columnar crystals crossed line perpendicular to the weld center were formed during the electron beam welding and a large number of carbides precipitated from the weld joint centerline for the poor Nb, which led to the obvious brittleness.The high cooling speed after boiler shutdown led to great stress, the crack formed on the weld centerline and then grew and cracked.
中图分类号 TG441.7
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收稿日期 2010/7/22
修改稿日期 2011/6/26
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备注路宝玺(1969-), 男, 山东淄博人, 工程师, 学士。
引用该论文: LU Bao-xi,YOU Zhao-hong,GUAN Kai-shu. Failure Analysis of Welding Cracking on Ethylene Cracking Tubes by Electron Beam Welding[J]. Materials for mechancial engineering, 2011, 35(9): 100～103
路宝玺,尤兆宏,关凯书. 电子束焊乙烯裂解炉管焊缝开裂失效分析[J]. 机械工程材料, 2011, 35(9): 100～103
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参考文献
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【4】李海英,祝美丽,张俊善,等.渗碳、蠕变共同作用下HK40和HP钢乙烯裂解炉管损伤过程模拟[J].机械工程材料,2005,29(11):17-20.
【5】丁毅,沈复中, 吕勇.不同服役期的HK40炉管显微组织分析[J].机械工程材料,2002,26(7):7-9.
【6】张礼敬,涂善东,戴敏丰.服役炉管微观组织损伤与焊接性的关系[J].机械工程材料,2004,28(3):51-54.
【7】ZHAO K, LOU L H, MA Y H,et al. Effect of minor niobium addition on microstructure of a nickel-base directionally solidified superalloy[J]. Materials Science and Engineering A,2008,476:372-377.
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【11】ARATA Y, MATSUDA F, MUKAE S,et al. Effect of weld solidification mode on tensile properties of aluminum weld metal[J]. Trans JWRI,1973,2:55-61.
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