Microstructure and mechanical properties of fiber laser welded QP980/press-hardened 22MnB5 steel joint
Microstructure and mechanical properties of fiber laser welded QP980/press-hardened 22MnB5 steel joint
复制标题
光纤激光焊接QP980/模压硬化22MnB5钢接头的显微组织和力学性能
DOI：
10.1016/j.jmrt.2020.07.011
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Guoxin Li
中科院分区：
文献类型：
--
作者：
Hongyun Zhao;Rongrong Huang;Yiming Sun;Caiwang Tan;Laijun Wu;Bo Chen;Xiaoguo Song;Guoxin Li
对QP 980钢和22 MnB 5钢进行了光纤激光对接焊接。研究了热输入对异种钢焊接接头组织演变和力学性能的影响。当焊接速度保持在2 m/min时，激光功率在1.6 ~ 2.4 kW范围内变化。随着激光功率的增加，熔合区的组织发生了变化。当激光功率为1.8 ~ 2.2kW时，观察到马氏体和少量贝氏体。在此范围外，FZ的组织由马氏体和铁素体的混合组织组成。在22 MnB 5钢压淬表面镀Al-Si涂层，促进了液相向铁素体的转变。异种钢接头热影响区由马氏体和贝氏体组成。22 MnB 5钢的回火行为导致热影响区出现软化区。SZ和QP 980钢母材硬度随组织演变而下降。当激光功率为1.8和2.0 kW时，QP 980母材发生断裂。当激光功率达到2.2 kW时，由于软化度增加，拉伸试样在SZ处失效。随着激光功率的进一步增大，焊缝的最薄弱区域为熔合区，铁素体使接头整体强度下降。在2.0 kW（4.04 mm）时获得了更好的埃里克森值，这通过更多的碰撞能量吸收和更好的抗变形性来平衡。
Fiber laser welding of QP980 steel and press-hardened 22MnB5 steel in butt configuration was performed in this study. The effect of heat input on microstructure evolution and mechanical properties of dissimilar joint was investigated. Laser power employed was varied from 1.6 to 2.4 kW while welding speed was kept constant at 2 m/min. The microstructure of fusion zone (FZ) was changed with the increasing laser power. Martensite and few bainite were observed when laser power ranged from 1.8 to 2.2 kW. Out of this range, the microstructure in FZ consisted of mixed structure of martensite and ferrite. Transformation from liquid phase to ferrite was promoted by Al-Si coating on the surface of press-hardened 22MnB5 steel. Heat affected zones (HAZs) of dissimilar joint were composed of martensite and bainite. Softened zone (SZ) appeared at the HAZ of 22MnB5 steel due to tempering behavior. The hardness of SZ and QP980 steel base metal declined with microstructure evolution. The fracture occurred at QP980 base metal when dissimilar joints were produced at laser power of 1.8 and 2.0 kW. When laser power reached 2.2 kW, the tensile samples failed at SZ owing to the increased softening degree. With further increasing laser power, the weakest region was FZ since ferrite declined the whole joint strength. A better Erichsen value was obtained at 2.0 kW (4.04 mm), which was balanced by more crash energy absorption and better deformation resistance.
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DOI：
10.1016/j.jmrt.2019.11.003
发表时间：
2020-01-01
影响因子：
6.4
作者：
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影响因子：
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DOI：
10.1016/j.jmatprotec.2018.02.015
发表时间：
2018-06-01
影响因子：
6.3
作者：
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DOI：
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发表时间：
2016-02-01
影响因子：
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