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焊接冷凝管在役断裂原因分析
引用本文:夏承钰,朱广宇,赵建祖,刘晓波,李永福,陈志波. 焊接冷凝管在役断裂原因分析[J]. 热力发电, 2006, 35(12): 67-69,83
作者姓名:夏承钰  朱广宇  赵建祖  刘晓波  李永福  陈志波
作者单位:[1]西安宝钛精密制管有限责任公司,陕西西安710119 [2]西安协力动力化学有限责任公司,陕西西安710054 [3]富拉尔基发电总厂,黑龙江齐齐哈尔161041
摘    要:分析了失效的焊接冷凝管裂源处断口、成分及显微组织,认为沿晶界析出的碳化物导致材料局部晶界脆化,熔合线处的沟槽造成应力集中,以及在生产和使用过程中产生的作用于焊管的应力等的共同作用是导致焊接冷凝管在役断裂的主要原因。

关 键 词:冷凝管  焊接  碳化物  应力  开裂
文章编号:1002-3364(2006)12-0067-03
收稿时间:2006-04-27
修稿时间:2006-04-27

CAUSE ANALYSIS OF WELDED CONDENSATION TUBE CRACKED IN SERVICE
XIA Cheng-yu,ZHD Guang-yu,ZHAO Jian-zu et al. CAUSE ANALYSIS OF WELDED CONDENSATION TUBE CRACKED IN SERVICE[J]. Thermal Power Generation, 2006, 35(12): 67-69,83
Authors:XIA Cheng-yu  ZHD Guang-yu  ZHAO Jian-zu et al
Abstract:The fracture, composition, and microscopic structure in cracked position of the failure welded condensation tube have been analysed. It is believed that the main causes lending to cracking of the welded condensation tube in service are joint effect of the following factors: the carbide precipitated in grain boundaries,resulting in local in-tergranular embrittlement; the groove in melting line area, leading to stress concentration; and the stress applied to welded tube in course of production and utilization.
Keywords:condensation tube  weld  carbide  stress  cracking  
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