Effect of different heat input on the microstructure and mechanical properties of laser cladding repaired 300M steel

• DOI: 10.1016/j.jmrt.2022.11.153
• Publication Date: 2022-11-29T08:09:46Z
• Authors: Yongsheng Zheng; Fenggang Liu; Jiaying Gao; Fencheng Liu; Chunping Huang; Haizhong Zheng; Pengfei Wang; Hao Qiu
• Keywords: Elongation; Cladding (metalworking)

Laser cladding repair technology is valued for its ability to of damaged parts with high performance. However, there are so many parameters affect the quality that it takes a lot work determine optimal parameters. In this article, variety were combined as dimensionless heat input (Q∗), and effect Q∗ on microstructure mechanical properties 300M steel repaired samples studied. Results showed increase Q∗, affected zone transformed from tempered martensite low bainite. The untempered small amount retained austenite. With increasing residence time above austenitizing temperature was extended, more uniform obtained in zone. What's more, at = 5.1, efficiency increases twice than 1. tensile strength reached 1017.6 MPa elongation 6.9%, which far lower forged samples. treatment carried out parts, eliminated difference due different Q∗. Compared without treatment, increased by 75% 1783.8 86% 10.4%.