Fe-Cr-Nb-B-C金属粉芯丝激光熔覆层的组织与磨损性能  

Microstructure and abrasive wear property of Fe-Cr-Nb-B-C alloy deposited by laser cladding with metal powder cored wire

作　　者：丁纯纯 贺定勇[1,2] 马利霞 翟迎迎 DING Chunchun;HE Dingyong;MA Lixia;ZHAI Yingying(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Eco-materials and LCA,Beijing 100124,China;Spray Technology Co.,Ltd.,Yixing 214200,Jiangsu,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京市生态环境材料及其评价工程技术研究中心,北京100124 [3]江苏斯普瑞科技有限公司,江苏宜兴214200

出　　处：《焊接》2025年第4期8-14,共7页Welding & Joining

摘　　要：【目的】旨在深入分析Fe-Cr-Nb-B-C金属粉芯丝激光熔覆层的物相组成、显微组织及磨粒磨损性能。【方法】研制了直径为1.2 mm的Fe-Cr-Nb-B-C金属粉芯丝,通过激光送丝熔覆方法在316L不锈钢板上制备了不同B元素含量的铁基熔覆层。通过光学显微镜(Optical microscopy,OM)、硬度计、扫描电子显微镜(Scanning electron microscope,SEM)、X射线衍射仪(X-ray diffractomer,XRD)、能谱仪(Energy dispersive spectroscopy,EDS)和MLS-225型湿式橡胶轮磨粒磨损试验机等手段,对熔覆层中的相组成、组织结构、显微硬度与洛氏硬度、磨粒磨损性能等进行研究。【结果】结果表明,耐磨熔覆层主要由γ-Fe,NbC,M_(23)(C,B)_6以及少量α-Fe组成,其中NbC硬质相会优先形成。在激光送丝熔覆过程中,当熔覆层Nb元素含量约为5.7%,B元素含量为0.9%时,通过外添加碳化硼方式制备的熔覆层综合性能更优、硬度高、耐磨损性能较好。【结论】随着B元素含量的提高,Fe-Cr-Nb-B-C合金中抗磨粒磨损性能提高,熔覆层中原位生成的NbC和M23(C,B)6硬质相是熔覆层硬度较高、耐磨性较好的主要原因。[Objective]The aim is to investigate the phase composition,microstructure and abrasive wear property of Fe-Cr-Nb-B-C metal powder core wire laser cladding layer.[Methods]Fe-Cr-Nb-B-C metal powder cored wire with diameter of 1.2 mm is prepared and iron-based cladding layers with different B contents are then deposited on 316L stainless steel substrates using laser wire feeding cladding techniques.The phase composition of the cladding layer is analyzed by optical microscope(OM),hardness tester,scanning electron microscope(SEM),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS)and an MLS-225 wet rubber wheel abrasive wear tester.The phase composition,microstructure,microhardness,Rockwell hardness and abrasive wear property of the cladding layer are investigated.[Results]The results show that the wear-resistant cladding layer primarily consisted ofγ-Fe,NbC,M23(C,B)6 and a small amount ofα-Fe,with the NbC hard phases forming preferentially.During laser wire cladding,when the Nb element content of the cladding layer is about 5.7%and the B element content is 0.9%,the addition of boron carbide led to optimal cladding layer property,characterized by high hardness and superior wear resistance.[Conclusion]As the B element content increases,the abrasive wear resistance of Fe-Cr-Nb-B-C alloy cladding layers improved significantly.The in-situ generated NbC and M23(C,B)6 hard phases within the cladding layer is identified as the primary reasons for the enhanced hardness and wear resistance.

关 键 词：金属粉芯丝 激光熔覆 Fe-Cr-Nb-B-C合金 磨粒磨损 表面工程 

分 类 号：TG422.3[金属学及工艺—焊接]