沈阳航空航天大学学报2026，Vol.43Issue(4)：47-56,10.DOI:10.3969/j.issn.2095-1248.2026.04.005
激光增材修复300M高强度钢的显微组织与力学性能
Microstructure and mechanical properties of laser additive manufacturing-repaired 300M high-strength steel
摘要
Abstract
To tap into the ecohomic benefits and scientific research value of repair techonlogy for aerospace high-strength steel components and meet the development needs of aerospace field,laser additive manufacturing repair technology was employed to repair cracks in 300M high-strength steel substrates.The microstructure,element distribution,static mechanical properties,and fracture morphology of the repaired specimen were analyzed.Results indicate that the microstructure of the repair zone exhibits a gradient characteristic from the top layer to the substrate:Bainite → Martensite+Bainite → Tempered Martensite.The heat-affected zone primarily consists of non-uniform Martensite.After heat treatment,all regions transform into a uniform mixture of tempered Martensite and Bainite.The as-deposited specimen shows higher hardness in the repair zone compared to the substrate,but softening occurs in the heat-affected zone.The as-deposited tensile specimen demonstrates low tensile and yield strength,good plasticity and a quasi-cleavage fracture morphology.After appropriate heat treatment,the strength increases significantly,but plasticity decreases markedly,and the fracture mode transitions to ductile fracture.关键词
激光增材修复技术/300M高强度钢/显微组织/力学性能/热处理Key words
laser additive manufacturing repair technology/300M high-strength steel/microstructure/mechanical properties/heat treatment分类
矿业与冶金引用本文复制引用
李东洋,杨光,任宇航..激光增材修复300M高强度钢的显微组织与力学性能[J].沈阳航空航天大学学报,2026,43(4):47-56,10.基金项目
国家重点研发计划项目(项目编号:2022YFE0122600). （项目编号:2022YFE0122600）
