应用激光, 2016, 36 (6): 635, 网络出版: 2017-01-23
激光修复300M超高强度钢冲击韧性及断裂机理
Fracture Mechanism of Impact Toughness of Laser Repaired 300M Ultra-high Strength Steel
激光修复 冲击韧性 断裂机理 300M超高强度钢 laser repairing impact toughness fracture mechanism 300M ultra-high strength steel
摘要
研究了激光修复300M超高强度钢冲击韧性及断裂机理。结果表明, 激光修复300M超高强度钢沉积态的显微组织从修复区顶部到基材区发生了显著变化, 经过热处理后显微组织发生明显均匀化, 修复试样沉积态的冲击韧性为14.3 J/cm2, 远低于300M超高强度钢锻件。经过热处理后, 冲击韧性有了显著地提高, 达到28.3 J/cm2。沉积态试样的断裂方式为准解理断裂, 主裂纹在扩展的过程中横穿马氏体领域, 且在遇到下一个领域时会发生偏转。热处理态试样的断裂方式为韧性断裂。
Abstract
The microstructure and impact toughness of laser repaired 300M ultra-high strength steel has been studied. The results showed that the microstructure of the as-deposited laser repaired 300M ultra-high strength steel changed significantly from the top of the repaired zone to the substrate zone. After heat treatment, the microstructure became uniform. The impact toughness of the as-deposited samples was 14.3 J/cm2, and much lower than that of the 300M forgings. Results also showed that the impact toughness was improved significantly to 28.3 J/cm2 after heat treatment. The fracture mode of the as-deposited sample was quasi-cleavage fracture. The main cracks would across the martensite packet during the process of extending and deflected in the next packet. The fracture of the sample was change to ductile mode after heat treatment.
刘丰刚, 林鑫, 陈静, 宋梦华, 韩一帆. 激光修复300M超高强度钢冲击韧性及断裂机理[J]. 应用激光, 2016, 36(6): 635. Liu Fenggang, Lin Xin, Chen Jing, Song Menghua, Han Yifan. Fracture Mechanism of Impact Toughness of Laser Repaired 300M Ultra-high Strength Steel[J]. APPLIED LASER, 2016, 36(6): 635.