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FV520B钢十字焊接接头的疲劳性能
引用本文:樊俊铃,郭杏林,吴承伟,邓德伟.FV520B钢十字焊接接头的疲劳性能[J].材料热处理学报,2012,33(7):76-81.
作者姓名:樊俊铃  郭杏林  吴承伟  邓德伟
作者单位:1. 大连理工大学工程力学系,辽宁大连,116024
2. 大连理工大学材料工程系,辽宁大连,116024
基金项目:国家自然科学基金,国家“973”计划项目
摘    要:用金相显微镜和扫描电镜观察了FV520B钢焊接接头母材、焊缝及热影响区的微观组织;并通过透射电镜给出了母材和焊缝的微观形貌。结果表明:母材组织为细小均匀的回火马氏体、弥散分布的析出相及高密度位错,而焊缝为粗大的板条马氏体及少量的析出相,说明母材力学性能优于焊缝。利用疲劳实验获得了高平均拉应力下接头的疲劳强度及S-N曲线等。通过对疲劳断口的观察,发现疲劳断裂主要有两种形式:破坏于焊趾处和焊接缺陷处,由于这里严重的应力集中,加速了疲劳裂纹的萌生。

关 键 词:FV520B钢  焊接接头  疲劳特性  微观组织  疲劳机理

Fatigue performance of cruciform welded joints of FV520B steel
FAN Jun-ling,GUO Xing-lin,WU Cheng-wei,DENG De-wei.Fatigue performance of cruciform welded joints of FV520B steel[J].Transactions of Materials and Heat Treatment,2012,33(7):76-81.
Authors:FAN Jun-ling  GUO Xing-lin  WU Cheng-wei  DENG De-wei
Affiliation:1.Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China; 2.Departement of Materials Engineering,Dalian University of Technology,Dalian 116024,China)
Abstract:Microstructure of base metal,weld seam and heat-affected zone of welded joints of FV520B steel were examined by optical microscopy,SEM and TEM.The results show that the microstructure of the base metal consists of fine tempered martensite and dispersively precipitated phase particles with high-density dislocations,whereas the microstructure of the weld seam is composed of coarse lath martensite and few of precipitated phase particles,indicating the better mechanical properties of the base metal.Fatigue tests were carried out to obtain the fatigue strength and the S-N curve of the welded joints subjected to a high mean stress.The observation of the fatigue fracture surface shows that fatigue failure occurs at the weld toe and welding defects due to serious stress concentration of these locations accelerating fatigue crack initiation.
Keywords:FV520B steel  welded joint  fatigue performance  mierostructure  fatigue mechanisms
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