Local microstructure and mechanical characteristics of HAZ and tensile behavior of laser welded QP980 joints
Local microstructure and mechanical characteristics of HAZ and tensile behavior of laser welded QP980 joints
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QP980激光焊接接头HAZ的局部显微组织和力学特性及拉伸行为
DOI：
10.1016/j.msea.2022.143862
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Hongqiang Zhang
中科院分区：
文献类型：
--
作者：
Junliang Xue;Wei Guo;Yongxin Zhang;Mingsheng Xia;Qiang Jia;Jiaxuan Chi;Jiaxin Shi;Ying Wu;Hongqiang Zhang
焊接热影响区（HAZ）的组织演变严重影响焊接接头的力学性能。本文采用光纤激光器对QP980钢进行了对接焊接。采用热电偶和Gleeble 1500系统实现了激光焊接接头热影响区的热模拟试样，解决了激光焊接热影响区窄而难以评价力学性能的问题。亚临界热影响区（SCHAZ）的块状马氏体中析出大量粒状碳化物。板条马氏体中未发现碳化物，但SCHAZ板条马氏体中存在位错缠结。此外，SCHAZ铁素体中的位错数量显著减少。由于回火，SCHAZ的强度最低，但延伸率最高。细晶强化导致细晶热影响区（FGHAZ）的抗拉强度最高。拉伸断口形貌表明，粗晶热影响区（CGHAZ）和FGHAZ为脆性断裂机制，而临界区（ICHAZ）和SCHAZ为韧性断裂机制。根据焊接接头的概况和焊接热影响区的局部力学特性，利用有限元软件ABAQUS建立了焊接接头拉伸试验的数值模型。模拟结果与实验结果吻合较好，既说明了SCHAZ的约束作用，又使应变集中随着应力的增加从SCHAZ向BM转移。
Microstructural evolution of the heat-affected zone (HAZ) seriously affects the mechanical properties of the welded joints. In this paper, QP980 steels were butt-welded by fiber laser. The thermocouple and Gleeble1500 system were used to achieve the thermal simulated HAZ specimens of laser welded joints, which solved the problem that it was difficult to evaluate the mechanical properties due to the narrow HAZ of the laser welding. Large amounts of granular carbides were precipitated in the block martensite of the sub-critical HAZ (SCHAZ). Carbides were not found in lath martensite, but there were dislocation tangles in the lath martensite of the SCHAZ. In addition, the number of dislocations in the ferrite of the SCHAZ was significantly reduced. The SCHAZ had the lowest strength but the highest elongation owing to the tempering. The fine-grain strengthening resulted in the highest tensile strength in the fine-grained HAZ (FGHAZ). The tensile fracture morphologies indicated a brittle fracture mechanism in coarse-grained HAZ (CGHAZ) and FGHAZ, and exhibited a ductile fracture mechanism in the inter-critical HAZ (ICHAZ) and SCHAZ. According to the overview of the joint and the local mechanical characteristics of HAZ, the numerical model of the tensile test was performed by ABAQUS. And the simulation results showed good agreement with the experimental results, which both illuminated the constraint effect of SCHAZ and made the strain concentration transferred from SCHAZ to the BM with the increase of stress.
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