Wang Yu, Feng Aixin, Pan Xiaoming, Chen Chunlun, Wei Yacheng, Wang Jun
College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, China.
Rui'an Graduate College, Wenzhou University, Wenzhou 325200, China.
Materials (Basel). 2023 Jun 8;16(12):4238. doi: 10.3390/ma16124238.
Laser shock peening is a promising surface strengthening technology that can effectively improve the mechanical properties of materials. This paper is based on the laser shock peening process for HC420LA low-alloy high-strength steel weldments. Contrast analysis of the evolution of the microstructure, residual stress distribution and mechanical properties of the welded joints before and after the laser shock peening on each region is carried out; a combination of tensile fracture and impact toughness fracture morphology analyses of laser shock peening on the welded joint strength and toughness regulation mechanism are also completed. The results show that the laser shock peening can refine the microstructure of the welded joint effectively, the microhardness of all areas of the joint increases and the weld residual tensile stresses are transformed into beneficial residual compressive stresses, affecting a layer depth of 600 μm. In addition, the strength and impact toughness of welded joints of HC420LA low-alloy high-strength steel are improved.
激光冲击喷丸是一种很有前景的表面强化技术，能有效改善材料的力学性能。本文基于HC420LA低合金高强度钢焊件的激光冲击喷丸工艺。对各区域激光冲击喷丸前后焊接接头的微观组织演变、残余应力分布及力学性能进行对比分析；还完成了激光冲击喷丸对焊接接头强度和韧性调控机制的拉伸断口与冲击韧性断口形貌分析相结合的研究。结果表明，激光冲击喷丸能有效细化焊接接头的微观组织，接头各区域的显微硬度增加，焊接残余拉应力转变为有益的残余压应力，影响层深达600μm。此外，HC420LA低合金高强度钢焊接接头的强度和冲击韧性得到提高。
