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Effects of Laser Premelting Treatment on Microstructure and Mechanical Properties of High-Strength Steel Weld Obtained by Laser-MAG Hybrid Welding
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-09 , DOI: 10.1007/s11665-020-05084-2
Yanqing Li , Shuangyu Liu , Qiushi Zhang , Yongsheng Ma , Fulong Zhang , Genzhe Huang

Experimental research is performed on ultra-high-strength steel using a 4-kW Nd:YAG laser and a metal active gas (MAG) welding facility providing two processes, namely laser-MAG hybrid welding (LMHW) and laser premelting + laser-MAG hybrid welding (LPLMHW). The study shows that LPLMHW produces joints with a fine lath martensite and excellent mechanical properties. Additionally, there is a certain random crystallographic orientation between the martensite laths by using the LPLMHW process. The microstructure within the martensite laths is refined and many high-angle lath boundaries are formed, which contribute to the enhancement of the impact energy of the joints obtained using the LPLMHW process. This interlaced high-angle grain boundary of martensite laths can significantly improve the tensile strength and toughness of the weld. The impact energy of the welded joints by LPLMHW is higher than that obtained by LMHW. The tensile strength and impact energy of the welded joints by the LPLMHW process reach 1313 MPa and 21.2 J, respectively. The impact energy of the welded joints by LPLMHW is double than that obtained by LMHW.



中文翻译:

激光预熔处理对激光-MAG混合焊接高强度钢焊缝组织和力学性能的影响

使用4 kW Nd:YAG激光器和金属活性气体(MAG)焊接设备对超高强度钢进行了实验研究,该设备提供了两种工艺,即激光-MAG混合焊接(LMHW)和激光预熔+激光-MAG混合焊接(LPLMHW)。研究表明,LPLMHW产生的接头具有良好的板条马氏体和出色的机械性能。此外,通过使用LPLMHW工艺,马氏体板条之间存在一定的随机晶体学取向。马氏体板条内部的微观结构得到细化,并形成了许多大角度板条边界,这有助于提高使用LPLMHW工艺获得的接头的冲击能。马氏体板条的这种交错的高角度晶界可以显着提高焊缝的拉伸强度和韧性。LLMMHW焊接接头的冲击能比LMHWW更高。LPLMHW工艺焊接接头的抗拉强度和冲击能分别达到1313 MPa和21.2J。LLMMHW焊接接头的冲击能是LMHW的两倍。

更新日期:2020-09-10
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