基于RAFM钢激光熔化沉积W-7Ni-3Fe合金的组织与性能  

Microstructure and Properties of Laser Melting Deposited W-7Ni-3Fe Alloy Based on RAFM Steel

作　　者：李纯 程钇朝 乐国敏[2] 何柳 杨晓珊 王斗 LI Chun;CHENG Yichao;LE Guomin;HE Liu;YANG Xiaoshan;WANG Dou(College of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144;Institute of Materials,China Academy of Engineering Physics,Mianyang 621908)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]中国工程物理研究院材料研究所,绵阳621908

出　　处：《特种铸造及有色合金》2025年第2期245-251,共7页Special Casting & Nonferrous Alloys

基　　金：中国工程物理研究院材料研究所基金资助项目(JBNY060104,TCGH0705)。

摘　　要：利用激光熔化沉积(LMD)技术在低活化马氏体/铁素体钢(RAFM)基板上直接沉积W-7Ni-3Fe合金,采用金相显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)、能谱分析仪(EDS)等研究了W/钢接头的组织演变,采用显微硬度计及拉伸试验机测试了W/钢接头的力学性能。结果表明,制备的W/钢接头呈冶金结合,接头处无裂纹。W/钢接头可分为基板层、反应层和W合金层3层组织。反应层弥散分布着大量Fe_(7)W_(6)颗粒和W颗粒,硬度(HV)最高可达662。W/钢接头抗拉强度最高可达557 MPa。由于反应层上部存在大量的W/Fe_(7)W_(6)界面,使得裂纹在该区形成与扩展而导致最终断裂。A laser melting deposition technique was utilized to directly deposit W-7Ni-3Fe alloy on RAFM steel sub⁃strate.The microstructure evolutions and mechanical properties of W/steel joints were investigated by OM,XRD,SEM and EDS,micro-hardness and tensile tests.The results indicate that the fabricated W/steel joints exhibit metal⁃lurgical bonding without cracks at the joints.The structure of joint is divided into substrate layer,reaction layer,and tungsten alloy layer.Large amounts of Fe_(7)W_(6) and W particles are dispersedly distributed in the reaction layer,leading to the high hardness up to 662 HV,and the tensile strength of W/steel joint reaches 557 MPa.Due to the presence of plenty of W/Fe_(7)W_(6) interfaces in the upper part of reaction layer,cracks initiate and propagate in the region,resulting in the final fractures.

关 键 词：W/钢连接 激光熔化沉积 金属间化合物 组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]