Microstructure and mechanical properties of a thick-section high-strength steel welded joint by novel double-sided hybrid fibre laser-arc welding
Microstructure and mechanical properties of a thick-section high-strength steel welded joint by novel double-sided hybrid fibre laser-arc welding
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DOI：
10.1016/j.msea.2013.05.077
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发表时间：
2013-10-10
期刊：
影响因子：
6.4
通讯作者：
Ma, Guolong
中科院分区：
文献类型：
--
作者：
Chen, Yanbin;Feng, Jiecai;Ma, Guolong
本文开发了一种新型双面混合光纤激光电弧焊工艺来连接 30 毫米厚的高强度钢，并将该工艺与传统双面电弧焊进行了比较。将焊接接头分为激光区和电弧区两个区域，详细研究了这些区域焊接接头的显微组织和力学性能。结果表明，激光区和电弧区主要由高位错密度的板条马氏体组成。激光区和电弧区的平均晶粒尺寸小于母材的平均晶粒尺寸。结果还表明，由于存在细小的板条马氏体，激光区和电弧区与母材相比具有更高的强度。同时，由于平均有效晶粒尺寸较小，在激光区观察到的强度略高于电弧区。相反，由于存在大量的多边形铁素体，母材的韧性高于激光区和电弧区的韧性。同时，由于具有大取向差角的晶界的普遍性增加，与电弧区相比，激光区的韧性显着增加。 (C) 2013 Elsevier B.V. 保留所有权利。
In this paper, a novel double-sided hybrid fibre laser-arc welding procedure was developed to join 30 mm thick, high-strength steel, and this procedure was compared with conventional double-sided arc welding. The welded joint was divided into two zones, the laser zone and the arc zone, and the microstructure and mechanical properties of the welded joint in these zones were investigated in detail. The results indicated that the laser zone and arc zone predominately consisted of lath martensite with a high dislocation density. The average grain sizes of the laser zone and the arc zone were smaller than that of the base metal. The results also indicated that the laser zone and the arc zone possessed higher strength when compared with the base metal because of the fine lath martensite. Meanwhile, the strength observed in the laser zone was slightly higher than that of the arc zone due to the small average effective grain size. On the contrary, the toughness of the base metal was higher than the toughness in the laser zone and the arc zone because of massive polygonal ferrites. Meanwhile, a significant increase in the toughness of the laser zone when compared with the arc zone occurred due to an increase in the prevalence of grain boundaries with large misorientation angles. (C) 2013 Elsevier B.V. All rights reserved.