稀释率对激光熔覆层组织与硬度的影响  

Effect of dilution rate on microstructure and hardness of laser cladding layer

作　　者：裴明源 王磊 赵京涛 王海强 高龙飞 刘代平 赵阳 范召森 刘志兰 PEI Mingyuan;WANG Lei;ZHAO Jingtao;WANG Haiqiang;GAO Longfei;LIU Daiping;ZHAO Yang;FAN Zhaosen;LIU Zhilan(Shandong Key Laboratory of Core Technology for Tire Mold,Gaomi 261500,China;Himile Mechanical Science and Technology(Shandong)Co.,Ltd.,Gaomi 261500,China)

机构地区：[1]山东省轮胎模具关键技术重点试验室,山东高密261500 [2]山东豪迈机械科技股份有限公司,山东高密261500

出　　处：《模具工业》2024年第10期69-76,共8页Die & Mould Industry

摘　　要：为探究不同碳钢基体下稀释率对熔覆层组织与硬度的影响,在Q235钢、35钢和45钢基体表面通过激光熔覆技术制备不同稀释率的316L不锈钢熔覆层,采用激光共聚焦显微镜、扫描电镜和维氏硬度计对熔覆层组织和硬度进行表征试验。试验结果表明:熔覆层稀释率随激光功率提高而增大,在相同激光功率下基体差异会对熔覆层的稀释率产生一定影响;熔覆层与基体间为冶金结合,随着稀释率增大,熔覆层与附近基体的元素趋于一致,结合效果增强,同时熔覆层中C含量的增加产生了弥散强化作用;熔覆层稀释率超过30%,伴随着快速凝固组织特征逐渐消失,熔覆层由奥氏体转变为马氏体,硬度值提升250~300HV。In order to explore the influence of dilution ratio on the microstructure and hardness of cladding layers under different carbon steel matrix,316L stainless steel cladding layers with differ-ent dilution ratio were prepared on the surfaces of Q235,35 and 45 steel substrates by laser clad-ding technology,and the microstructure and hardness of cladding layers were characterized by la-ser confocal microscope,scanning electron microscope and Vickers hardness tester.The experi-mental results showed that the dilution rate of cladding layer increased with the increase of laser power,and the matrix difference would have a certain influence on the dilution rate of cladding layer under the same laser power.The cladding layer and the matrix were metallurgically bonded,the elements of the cladding layer and the nearby matrix tended to be consistent with the increase of dilution rate,and the bonding effect was enhanced,at the same time,the increase of C element content in the cladding layer had a dispersion strengthening effect.The dilution rate of cladding layer was over 30%,and the microstructure characteristics of rapid solidification gradually disap-peared,and the cladding layer changed from austenite to martensite,and the hardness value in-creased by 250~300 HV.

关 键 词：稀释率 碳钢 马氏体 激光功率 元素 

分 类 号：TG174[金属学及工艺—金属表面处理]