Cr12模具钢Fe50-TiC复合激光熔覆层的形貌、组织和力学性能  

Morphology,Microstructure,and Mechanical Properties of Fe50-TiC Composite Laser Cladding Layer on Cr12 Mold Steel

作　　者：王乾廷 曾宪斌 陈昌荣 练国富 黄旭 王彦 Wang Qianting;Zeng Xianbin;Chen Changrong;Lian Guofu;Huang Xu;Wang Yan(College of Materials Science and Engineering,Fujian University of Technology,Fuzhou,Fujian 350118,China;Fujian Provincial Key Laboratory of Advanced Materials Processing and Application,Fuzhou,Fujian 350118,China;Fujian Provincial Precision Processing Manufacturing Engineering Research Center,Fuzhou,Fujian 350118,China;School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou,Fujian 350118,China;School of Computing,Engineering&Mathematics,University of Brighton,Brighton,BN24AT,England)

机构地区：[1]福建工程学院材料科学与工程学院,福建福州350118 [2]福建省新材料制备与成形技术重点实验室,福建福州350118 [3]福建省精确成型制造工程研究中心,福建福州350118 [4]福建工程学院机械与汽车工程学院,福建福州350118 [5]英国布莱顿大学计算、工程与数学学院,英国布莱顿BN24AT

出　　处：《激光与光电子学进展》2021年第7期221-229,共9页Laser & Optoelectronics Progress

基　　金：中央引导地方科技发展专项(2018L3001);福建省教育厅高校领军人才项目(2018-12);福建省教育厅中青年教师教育科研项目(JAT170376);第三批福建省特殊支持“双百计划”人才项目(2018-5)。

摘　　要：针对模具表面易磨损失效的问题,本文采用同步送粉激光熔覆技术在Cr12模具钢表面制备了一系列Fe50-TiC复合熔覆层,并利用扫描电镜(SEM)、显微硬度计、摩擦磨损试验机对熔覆层的微观组织、气孔率、显微硬度及耐磨性能进行分析,探索TiC含量对Fe50-TiC熔覆层的影响规律。研究结果表明:随着TiC含量的增加,复合熔覆层的显微硬度逐渐增大,耐磨性随之增强,但气孔率也呈增大的趋势,未熔TiC颗粒增多,基于颗粒形核生长的组织增多;当TiC的质量分数为35%时,熔覆层的气孔率有所下降,TiC以溶解形核生长的树枝晶为主,熔覆层的平均显微硬度(46.3 HRC)约为基体的2.4倍,磨损体积约为基体的13%。采用Fe50-35%TiC复合粉末制备的Fe50-TiC熔覆层具有较优的综合性能。Aiming at the problem of easy wear and failure of the mold,a series of Fe50/TiC composite coatings with different TiC mass fractions were prepared on the surface of Cr12 mold steel using coaxial laser cladding technology.The microstructure,porosity,microhardness,and wear resistance of the cladding layers were investigated using scanning electron microscopy(SEM),microhardness tester,and tribological tester to explore the effect of TiC content on the cladding layer.Results show that as the TiC content increases,the microhardness and the wear resistance of the composite cladding layer increase,but the porosity also exhibits an increasing trend.At the same time,the higher the TiC content,the more undissolved TiC particles in the cladding layer for nucleation,and the more the microstructure nucleating and growing based on pariticles.When the mass fraction of TiC was 35%,the porosity of the cladding layer decreased and grown dendrite TiC was observed owing to dissolution nucleation.The average microhardness(46.3 HRC)of the cladding layer was approximately 2.4 times that of the substrate,and the wear volume was approximately 13%of the substrate.Fe50-TiC cladding layer fabricated using Fe50-35%TiC exhibits better comprehensive properties.

关 键 词：激光技术 激光熔覆 显微组织 显微硬度 耐磨性 气孔率 

分 类 号：TG174.442[金属学及工艺—金属表面处理]