Zhang Hua, Xu Jiahui, Hao Desheng, Esmail Othman Mohammed Ali Othman
School of Mechanical Engineering, Nantong University, Nantong 226019, China.
Materials (Basel). 2023 Mar 30;16(7):2774. doi: 10.3390/ma16072774.
Dissimilarities in metal laser welding lead to brittleness in welded joints due to differences in the thermophysical and chemical properties between dissimilar base materials. To overcome such brittleness, the addition of a preset coating onto the base materials as an interlayer is a method for attaining reliable welded joints. Nd:YAG laser butt welding of DP590 dual-phase steel and 304 stainless, both with a thickness of 1 mm, was performed with a preset nickel coating as an interlayer using an electroplating process. The relationship between the microstructure and the mechanical properties of the welded joints was researched, the microstructure and composition of the weldment were analyzed, and the microhardness, tensile strength and corrosion resistance were tested. The results showed that the preset nickel coating increased the content of Ni element in the welded joints, which is beneficial to the formation of lath martensite. The average hardness of the welded joints increased by 12%, and the tensile strength was higher than 370 MPa. The corrosion rate of the welded joints can be slowed down, and the corrosion resistance can be improved by increasing the nickel coating.
由于异种母材之间热物理和化学性质的差异，金属激光焊接中的差异会导致焊接接头出现脆性。为了克服这种脆性，在母材上添加预设涂层作为中间层是获得可靠焊接接头的一种方法。采用电镀工艺，以预设的镍涂层作为中间层，对厚度均为1mm的DP590双相钢和304不锈钢进行了Nd:YAG激光对接焊接。研究了焊接接头的微观结构与力学性能之间的关系，分析了焊件的微观结构和成分，并测试了显微硬度、抗拉强度和耐腐蚀性。结果表明，预设的镍涂层增加了焊接接头中Ni元素的含量，这有利于板条马氏体的形成。焊接接头的平均硬度提高了12%，抗拉强度高于370MPa。增加镍涂层可以减缓焊接接头的腐蚀速率，提高耐腐蚀性。
