Yoo Young-Ran, Kim Jae-Sung, Kim Young-Sik
Materials Research Centre for Energy and Clean Technology, Andong National University, 1375 Gyeongdong-ro, Andong 36729, Korea.
Chosun Welding Co., Ltd., 34-13, Hwasan 2-gil, Onsan, Ulju, Ulsan 45009, Korea.
Materials (Basel). 2022 Jun 1;15(11):3947. doi: 10.3390/ma15113947.
The introduction of tensile residual stress has led to the induction of damage such as fatigue, corrosion fatigue, and stress corrosion cracking (SCC) in stainless steel in association with the influence of environments, components, surface defects, and corrosive factors during its use. Compressive residual stress can be achieved through various techniques. Among several methods, laser peening can be more attractive as it creates regularity on the surface with a high-quality surface finish. However, there is very little research on heavily peened surface and cross-section of stainless steel with very deep compressive residual stress. This work focused on welding and laser peening and the influence of Al coating on the microstructural changes in 304L stainless steel. The specimen obtained by laser peening had a very deep compressive residual stress of over 1 mm and was evaluated based on microstructural and hardness analysis. Therefore, a model for microstructural change by laser peening on welded 304L stainless steel was proposed.
拉伸残余应力的引入，在不锈钢使用过程中，伴随着环境、部件、表面缺陷和腐蚀因素的影响，导致了诸如疲劳、腐蚀疲劳和应力腐蚀开裂（SCC）等损伤的产生。通过各种技术可以实现压缩残余应力。在几种方法中，激光喷丸因其能在表面形成高质量表面光洁度的规则性而更具吸引力。然而，对于具有非常深的压缩残余应力的不锈钢重喷丸表面和横截面的研究非常少。这项工作聚焦于焊接和激光喷丸以及铝涂层对304L不锈钢微观结构变化的影响。通过激光喷丸获得的试样具有超过1毫米的非常深的压缩残余应力，并基于微观结构和硬度分析进行了评估。因此，提出了一个关于激光喷丸对焊接304L不锈钢微观结构变化的模型。
