樊俊铃,郭杏林,吴承伟,邓德伟

• 1:大连理工大学工程力学系
• 2:大连理工大学材料工程系

摘要(Abstract)：

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(KeyWords)： FV520B钢;焊接接头;疲劳特性;微观组织;疲劳机理

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11072045);; 国家“973”计划项目(2011CB706504)

作者(Author): 樊俊铃,郭杏林,吴承伟,邓德伟

DOI: 10.13289/j.issn.1009-6264.2012.07.026

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