| 304/Q345R复合板焊接接头微观组织及残余应力 |
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| 引用本文： | 胡效东,王吉涛,杨熠成,宋明,齐鹏飞.304/Q345R复合板焊接接头微观组织及残余应力[J].焊接学报,2020,41(7):39-45. |
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| 作者姓名： | 胡效东 王吉涛 杨熠成 宋明 齐鹏飞 |
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| 作者单位： | 1.山东科技大学，青岛，266590 |
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| 基金项目： | 山东省重点研发计划;山东省自然科学基金;国家自然科学基金 |
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| 摘 要： | 为研究复合板在焊接过程中复杂的热力学行为，利用ABAQUS有限元软件对304/Q345R复合板的焊接过程进行了数值模拟，通过热电偶和盲孔法获得了焊接接头的热循环曲线和残余应力分布规律，验证了有限元模型的正确性. 同时采用光学显微镜和扫描电镜对焊接接头的微观组织、晶粒形貌和元素分布进行了分析，研究焊接接头部位的微观组织演化规律. 结果表明，焊接残余应力最大值为312 MPa，位于焊趾附近，残余应力沿焊缝至母材方向逐渐降低并趋于稳定. 在两种材料的交界面处发现残余应力不连续现象. 焊接接头微观组织主要由奥氏体和铁素体组成，复层熔合线附近的铁素体以板条状和针状形成带状过渡区，而熔合线附近的奥氏体晶粒成柱状形貌且尺寸更为微小.
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| 关 键 词： | 复合板 元素稀释 微观组织 有限元法 焊接残余应力 |
| 收稿时间： | 2019-09-15 |
Microstructure investigation and residual stress numerical simulation on welded joint of 304/Q345R composite plate |
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| Affiliation: | 1.Shandong University of Science and Technology, Qingdao, 266590, China2.China University of Petroleum (East China), Qingdao, 266580, China |
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| Abstract: | In order to study the complex thermo-mechanical behavior of the composite plate in the welding process, a finite element model was developed to simulate the welding process of 304/Q345R composite plate. The thermal cycle curve and residual stress distribution of the welded joint were obtained by thermocouple and blind hole method. The finite element model was verified by the experimental results. Meanwhile, the microstructure, grain morphology and element distribution of the welded joint were analyzed by means of optical microscope and scanning electron microscope, and the microstructure evolution of the welded joint was investigated. The results showed that the maximum welding residual stress was 312 MPa, which was located at the weld toe, and the residual stress gradually decreased and stabilized along the direction from the weld to the base metal. At the interface of the two materials, the residual stress discontinuity was observed. The microstructure of the welded joint was composed of austenite and ferrite. The ferrite in the vicinity of the fusion line of the composite layer presents strip and needle-like shape and forms a banded transition zone, while the austenite grains in the vicinity of the fusion line presents columnar morphology and smaller size. |
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