扫描速度对激光熔覆Fe-Al合金熔覆层组织及性能的影响  

Microstructure and Properties of Laser Cladding Fe‐Al Alloy at Different Scanning Speeds

作　　者：姚文博 刘忱 商硕 刘常升 YAO Wen-bo;LIU Chen;SHANG Shuo;LIU Chang-sheng(School of Materials Science&Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2024年第2期170-178,共9页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51771051).

摘　　要：为提高工程用高强钢的耐蚀性并降低使用材料成本,采用光纤激光器在Q960E高强钢表面以同轴送粉工艺制备Fe-Al合金熔覆层,研究不同扫描速度对组织及耐蚀性的影响.结果表明,熔覆层的晶粒形态与元素分布及含量都受到扫描速度的影响.物相主要由DO3结构的Fe3Al相和B2结构的FeAl相以共晶形式组成.熔覆层的硬度随扫描速度增加受晶粒细化的影响逐渐提高.3种扫描速度下的熔覆层自腐蚀电位随扫描速度增加先上升后下降,自腐蚀电流密度先减小后增大,经过极化后的熔覆层表面点蚀坑随扫描速度的增加先由深变浅,后点蚀坑面积扩大.In order to improve the corrosion resistance of engineering high‐strength steel and reduce the cost of materials used,a fiber laser was used to prepare Fe‐Al alloy cladding layer on the surface of Q960E high‐strength steel by coaxial powder feeding process and to study the effect of different scanning speeds on microstructure and corrosion resistance.The results show that the grain morphology,element distribution,and content of the cladding layer are affected by the scanning speed.The material phase is mainly composed of the Fe3Al phase with DO3 structure and the FeAl phase with B2 structure in the eutectic form.The hardness of the cladding layer increases gradually with the scanning speed due to grain refinement.The self corrosion potential of the cladding layer at the three scanning speeds rises first and then decreases with the increase of scanning speed,and the self corrosion current density decreases first and then increases.With the increase of scanning speed,the pitting pits on the surface of the cladding layer after polarization first change from deep to shallow,and then the area of pitting pits expands.

关 键 词：激光熔覆 FE-AL合金 扫描速度 微观组织 电化学性能 

分 类 号：TG174[金属学及工艺—金属表面处理]