当前位置：首页 > 过刊浏览->2026年47卷第7期
激光重熔 18Ni(200)马氏体时效钢快速凝固及热处理过程组织性能演化机理
Microstructural Evolution and Mechanical Properties of Laser-remelted18Ni(200) Maraging Steel During Rapid Solidification and Heat Treatment
浏览(3) 下载(0)
- DOI:
- 作者:
- 钟昊宇 1，杨佳伟 1，任化永 1，许 泉 2，李小琳 1，王志军 1
ZHONG Haoyu1, YANG Jiawei1, REN Huayong1, XU Quan2, LI Xiaolin1, WANG Zhijun1
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西 西安 710072；2. 上海机电工程研究所，上海 201109
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. ShanghaiInstitute of Electro-Mechanical Engineering, Shanghai 201109, China
- 关键词:
- 马氏体时效钢；激光重熔；原位修复
maraging steel; laser remelting; in-situ remediation
- 摘要:
- 18Ni(200)马氏体时效钢作为一种低碳马氏体时效钢因高强度、高韧性等性能被广泛应用于航空航天等领域，但因其服役工况苛刻，在服役过程中易产生磨损。 激光重熔可实现构件的原位修复，并显著提升构件表面质量，延长其使用寿命。 作为激光重熔的关键环节，快速凝固及热处理过程中组织、性能演化机理是重要科学问题。 探究了不同能量密度下重熔层深度、硬度的变化规律。 结果表明，能量密度仅对重熔层深度产生影响，修复后重熔层组织、硬度均一性较好。 阐述了热处理后重熔层与基材的组织演化机理，热处理后重熔层与基材小角度晶界、应力分布均匀，重熔层界面无应力集中，与基材匹配度较高，修复后形成的重熔层在热处理前、后均可靠有效。
As a low-carbon maraging steel, 18Ni(200) maraging steel is widely utilized in aerospace applications because ofits superior mechanical properties, such as high strength and toughness. However, under demanding service conditions, thematerial is prone to wear damage. Laser remelting was employed to perform in situ repair of damaged components, whichsignificantly improved the surface quality and extended their service life. The evolution mechanisms of the microstructureand properties during rapid solidification and heat treatment, key stages of the laser remelting process, were investigated ascritical scientific aspects. An investigation was conducted on the variation patterns of the depth and hardness of theremelted layer under different energy densities. The results indicate that the energy density solely affects the depth of theremelted layer, whereas the microstructure and hardness of the repaired remelted layer demonstrate favourable uniformity.Furthermore, the microstructural evolution in the clad zone and the substrate after heat treatment was elucidated. The resultsreveal a uniform distribution of low-angle grain boundaries and residual stress in both regions, with no stress concentrationobserved at the interface. This demonstrates excellent compatibility between the cladding layer and the substrate,confirming the reliability and effectiveness of the repaired region both before and after heat treatment