| 高速列车用6061和7N01铝合金焊接接头断裂韧性分析 |
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| 引用本文： | 吴影,陈辉,苟国庆,于金朋,车小莉,王志海.高速列车用6061和7N01铝合金焊接接头断裂韧性分析[J].焊接学报,2014,35(9):77-81. |
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| 作者姓名： | 吴影 陈辉 苟国庆 于金朋 车小莉 王志海 |
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| 作者单位： | 1.西南交通大学四川省先进焊接及表面工程技术研究中心, 成都 610031 |
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| 基金项目： | 国家科技支撑计划资助项目(2009BAG12A04-D02) |
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| 摘 要： | 按照国家标准GB/T 21143-2007《金属材料准静态断裂韧度的统一试验方法》求得高速列车用6061和7N01铝合金焊接接头中焊缝、热影响区和母材3个区域的CTOD值δc和J积分值Jc,借助于数理统计的方法对焊接接头的断裂韧性进行了分析,并结合金相组织和断口形貌分析了它们之间关系.结果表明,对数正态分布对小样本断裂韧性数据拟合程度最好;6061和7N01铝合金焊接接头中各区域δc值和Jc值热影响区最大,焊缝次之,母材最小;6061和7N01铝合金焊接接头比较,7N01铝合金焊接接头中母材和焊缝的δc值和Jc值都优于6061铝合金焊接接头的相同区域;热影响区的δc值6061铝合金优于7N01铝合金;而热影响区的Jc值7N01铝合金优于6061铝合金.
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| 关 键 词： | 6061铝合金 7N01铝合金 断裂韧性 对数正态分布 |
| 收稿时间： | 2013/3/22 0:00:00 |
Fracture toughness of 6061 and 7N01 aluminum alloy welded joints for high-speed train |
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| WU Ying,CHEN Hui,GOU Guoqing,YU Jinpeng,CHE Xiaoli and WANG Zhihai.Fracture toughness of 6061 and 7N01 aluminum alloy welded joints for high-speed train[J].Transactions of The China Welding Institution,2014,35(9):77-81. |
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| Authors: | WU Ying CHEN Hui GOU Guoqing YU Jinpeng CHE Xiaoli and WANG Zhihai |
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| Affiliation: | 1.Research Center of Sichuan Advanced Welding and Surface Engineering, Southwest Jiaotong University, Chengdu 610031, China2.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;Production Research and Development Center, CNR Tangshan Railway Vehicle Co., Ltd., Tangshan 063035, China3.Production Research and Development Center, CNR Tangshan Railway Vehicle Co., Ltd., Tangshan 063035, China |
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| Abstract: | According to Chinese Standard GB/T 21143-2007 Metallic materials-Unified method of test for determination of quasistatic, the fracture toughness CTOD value δc and J integral value Jc in different areas of the welded joints of 6061 and7N01 aluminum alloys commonly used in high-speed trains were obtained. Using mathematical and statistical methods, the fracture toughness of the welded joints and the relationship between fracture toughness, microstructure and fracture morphology were analyzed. The results show that logarithmic normal distribution was best fitted for fracture toughness data acquired from small samples. Generally, δc and Jc in both 6061 and 7N01 aluminum alloy welded joints had the maximum values in the HAZ, followed by in WM and BM. However, δc and Jc in BM and WM of7N01 aluminum alloy welded joint were greater than those of6061 aluminum alloy welded joint. δc in HAZ of 6061 aluminum alloy welded joint was greater than that of 7N01 aluminum alloy welded joint, while Jc in HAZ of 7N01 aluminum alloy welded joint was better than that of 6061 aluminum alloy welded joint. |
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| Keywords: | 6061 aluminum alloy 7N01 aluminum alloy fracture toughness log-normal distribution |
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