摘要
为有效修复FV520B钢表面损伤,并提升修复后表面的耐腐蚀性能,尝试采用先堆焊,再进行激光表面处理的方法,即先采用明弧摆动堆焊方法,在FV520B钢基材上使用马氏体型药芯焊丝进行堆焊,并分别采用两种激光(半导体激光和光纤激光)对堆焊后的表面进行激光表面处理。研究了堆焊层的显微组织、硬度,堆焊层与基材的元素分布情况,以及经过激光表面处理后堆焊层的显微组织、硬度、耐腐蚀性和激光作用深度。研究结果表明,堆焊层由马氏体、δ-铁素体、残留奥氏体和碳化物构成,硬度约为480 HV0.3,相比基材提高了约33.33%,堆焊层与基材之间冶金结合良好。经过激光表面处理后,堆焊层分为原始堆焊区、热影响区和重熔区。在热影响区,硬度会下降,这与激光表面处理的回火作用有关;在重熔区,硬度与原始焊接区相当。浸泡试验结果表明,激光表面处理提高了堆焊层的耐腐蚀性。随着扫描速度的降低,激光的作用深度会增加,但硬度变化不大。相对于光纤激光器,半导体激光器的作用深度更大,但两种激光处理后的表面硬度基本相同。
In order to effectively repair the surface damage of FV520B steel and improve the corrosion resistance of the repaired surface,the method of surfacing followed by laser surface treatment was applied,i.e.,surfacing was first performed by open-arc swing cladding method with martensitic-type flux-cored wires on the base material of the FV520B steel,and laser surface treatment was performed on the surfaced layer with two types of lasers(semiconductor and fibre optic lasers),respectively.The microstructure and hardness of the surfaced layer,the elemental distribution between the surfaced layer and the base material,as well as the microstructure,hardness,corrosion and depth of laser effects of the surfaced layer after laser surface treatment were investigated.The results show that the surfaced layer consists of martensite,δ-ferrite,retained austenite and carbide,and the hardness is about 480 HV0.3,which is about 33.33%higher than the base material,and the metallurgical bonding between the surfaced layer and the base material is well established.After laser surface treatment,the surfaced layer is categorised into the original surfaced zone,the heat affected zone and the remelted zone.In the heat affected zone,the hardness decreases,which is related to the tempering effect of the laser surface treatment,in the remelted zone,the hardness is comparable to the original surfaced zone.The results of the immersion experiments show that the laser surface treatment improves the corrosion resistance of the surfaced layer.As the scanning speed decreases,the depth of laser action increases,but the hardness does not change much.Compared with the fibre laser,the semiconductor laser has a greater depth of effect,but the surface hardness after both laser treatments is basically the same.
作者
邓德伟
李振华
陈文博
汪红所
孙磊
Deng Dewei;Li Zhenhua;Chen Wenbo;Wang Hongsuo;Sun Lei(Technology Innovation Centre for Laser 3D Printing Equipment and Applications(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116024,China;Dalian Marine Valve Co.,Ltd.,Dalian Liaoning 116026,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第3期56-63,共8页
Heat Treatment of Metals
基金
高端阀产业技术协同创新中心基金(2022DMV003)
辽宁省激光3D打印装备及应用专业技术创新中心基金(DUT2022031)。
关键词
FV520B钢
堆焊
激光表面处理
组织
硬度
FV520B steel
surfaced
laser surface treatment
microstructure
hardness
