| 980MPa级高强钢焊接接头HAZ的组织和性能 |
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| 引用本文： | 冯伟,曹睿,彭云,杜挽生,田志凌,陈剑虹.980MPa级高强钢焊接接头HAZ的组织和性能[J].焊接学报,2009,30(7):17-20. |
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| 作者姓名： | 冯伟 曹睿 彭云 杜挽生 田志凌 陈剑虹 |
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| 作者单位： | 1. 兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州,730050
2. 钢铁研究总院结构材料研究所,北京,100081 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 采用焊接热模拟的方法,研究一种980 MPa级低碳贝氏体高强钢焊接接头HAZ不同区域,通过对各个区域的组织及相的分析,以及相应的拉伸及冲击试验研究了此类高强钢的组织和性能.结果表明,粗晶区的冲击性能最好,细晶区的冲击性能最低,为热影响区的薄弱环节.粗晶区组织为均匀粗细相间的板条贝氏体组织;在板条贝氏体上弥散析出碳化物;板条贝氏体界面上的奥氏体薄膜的存在是粗晶区韧性提高的原因.细晶区为孪晶马氏体+少量的板条马氏体,孪晶马氏体是导致细晶区性能下降的主要原因.Abstract：Microstructure and mechanical properties of HAZ of 980 MPa low carbon bainite high strength steel joints were studied . The different regions of welded joint HAZ were simulated by welding thermal simulation technique. Microstructure observation, phase analysis, and corresponding tensile and impact test for different regions of welded joint HAZ were taken. The results indicate: the impact property of coarse grain zone is the best, while the impact property of fine grain zone is the worst. So the fine grain zone is the weakest part of the welded joint. Microstructure of coarse grain zone is uniform interweaved coarse and fine lath martensites, and precipitation acicular ferrite are distributed between the lath martensites. Toughness of coarse grain zone is increased owing to the austenite thin film adherent lath martensite interface. Microstructure of fine grain zone are twin martensite and a small number of lath maarten-site, only minor acicular ferrite are distributed in the twin martensite . Toughness of fine-grained zone was decreased owing to twin martensite.
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| 关 键 词： | 980 MPa级高强钢 焊接热模拟 热影响区 奥氏体薄膜 |
| 收稿时间： | 2008/6/12 0:00:00 |
Microstructure and mecharical properties of HAZ of 980 MPa high strength steel joints |
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| FENG Wei,CAO Rui,PENG Yun,DU Wansheng,TIAN Zhiling and CHEN Jianhong.Microstructure and mecharical properties of HAZ of 980 MPa high strength steel joints[J].Transactions of The China Welding Institution,2009,30(7):17-20. |
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| Authors: | FENG Wei CAO Rui PENG Yun DU Wansheng TIAN Zhiling and CHEN Jianhong |
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| Affiliation: | State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Techenology, Lanzhou 730050, China,State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Techenology, Lanzhou 730050, China,Division of Strucrural Materials, Central Iron and Steel Research Institute, Beijing 100081, China,Division of Strucrural Materials, Central Iron and Steel Research Institute, Beijing 100081, China,Division of Strucrural Materials, Central Iron and Steel Research Institute, Beijing 100081, China and State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Techenology, Lanzhou 730050, China |
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| Abstract: | Microstructure and mechanical properties of HAZ of 980 MPa low carbon bainite high strength steel joints were studied . The different regions of welded joint HAZ were simulated by welding thermal simulation technique. Microstructure observation, phase analysis, and corresponding tensile and impact test for different regions of welded joint HAZ were taken. The results indicate: the impact property of coarse grain zone is the best, while the impact property of fine grain zone is the worst. So the fine grain zone is the weakest part of the welded joint. Microstructure of coarse grain zone is uniform interweaved coarse and fine lath martensites, and precipitation acicular ferrite are distributed between the lath martensites. Toughness of coarse grain zone is increased owing to the austenite thin film adherent lath martensite interface. Microstructure of fine grain zone are twin martensite and a small number of lath maarten-site, only minor acicular ferrite are distributed in the twin martensite . Toughness of fine-grained zone was decreased owing to twin martensite. |
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| Keywords: | 980 MPa high strength steel welding thermal simulation heat affected zone austenite film |
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