Study on Corrosion Resistance and Mechanical Property of Welding HAZ Treated by Laser Surface Remelting

Abstract

Welding is a main joint way of the alloy constructional steel. However, the welding HAZ is very sensitive to corrosion. In order to increase the corrosion resistance of the welding HAZ without reducing mechanical property of the parts simultaneously, the laser surface remelting was used to treat the welding HAZ in this study. According to the results of the orthogonal test, the optimized processing parameters were obtained. Based on the electrochemical analysis, the corrosion current of 30CrMnSi welding HAZ can be decreased by laser remelting technology. The corrosion resistance of the HAZ can be improved effectively. At the same time, the mechanical property of the treated welding HAZ was better compared with the untreated.

Microstructure Morphology and Mechanical Properties of Steel 30CrMnSiNi2A Irradiated by Continuous Wave Laser

“…Improving the microstructure and performance of metal alloy by means of laser heat treatment is also the major working of laser material processing. These researchers are expert in characterization of microstructure morphology and mechanical properties of alloy after laser heat treatment, and established connection with laser parameters [13][14][15][16][17][18][19][20][21]. It is known, the response of material irradiated by laser is related to its physical properties, and the physical properties are determined by microstructure.…”

“…It is used for aerospace structure material such as manufacturing high strength structural parts of aircraft for its excellent comprehensive properties. Considering important application of this steel in various fields, some works have been done about its laser heat treatment by researchers [17][18][19][20][21], But rare about its laser coupling rule [22].…”