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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Laser Premelting Treatment on Microstructure and Mechanical Properties of High-Strength Steel Weld Obtained by Laser-MAG Hybrid Welding
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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

机译：激光头部对激光 - MAG混合焊接的高强度钢焊接微观结构和力学性能的影响

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摘要

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.
机译：使用4-KW ND：YAG激光器和金属活性气体（MAG）焊接设施提供两种方法的超高强度钢进行实验研究，即激光 - MAG混合焊（LMHW）和激光预头+激光MAG混合焊接（LPLMHW）。该研究表明，LPLMHW产生具有精细Lath马氏体和优异的机械性能的关节。另外，使用LPLMHW工艺在马氏体板条之间存在一定的随机结晶取向。 Martensite Laths内的微观结构是精制的，并且形成了许多高角度的Lath边界，这有助于增强使用LPLMHW过程获得的接头的冲击能量。 Martensite板条的这种隔行扫描的高角度晶界可以显着提高焊缝的拉伸强度和韧性。 LPLMHW焊接接头的冲击能量高于通过LMHW获得的冲击能量。 LPLMHW过程的焊接接头的拉伸强度和冲击能量分别达到1313MPa和21.2 j。 LPLMHW的焊接接头的冲击能量与LMHW获得的双倍。

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