邵延凡,王泽华,李潇,李金龙,顾宸瑜.双相不锈钢表面激光熔覆钴基合金组织和性能研究[J].表面技术,2020,49(4):299-305.
SHAO Yan-fan,WANG Ze-hua,LI Xiao,LI Jin-long,GU Chen-yu.Microstructure and Properties of Laser Cladding Co-based Alloys on Duplex Stainless Steel[J].Surface Technology,2020,49(4):299-305
双相不锈钢表面激光熔覆钴基合金组织和性能研究
Microstructure and Properties of Laser Cladding Co-based Alloys on Duplex Stainless Steel
投稿时间:2019-05-21  修订日期:2020-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2020.04.035
中文关键词:  激光熔覆  双相不锈钢  钴基合金  耐磨性  耐蚀性
英文关键词:laser cladding  duplex stainless steel  Co-based alloys  wear resistance  corrosion resistance
基金项目:中央高校基本科研业务费专项资金(2019B77014);江苏省研究生实践创新计划(SJCX19-0148)
作者单位
邵延凡 1.河海大学 力学与材料学院,南京 211100 
王泽华 1.河海大学 力学与材料学院,南京 211100 
李潇 1.河海大学 力学与材料学院,南京 211100 
李金龙 2.中国科学院宁波材料技术与工程研究所,浙江 宁波 315000 
顾宸瑜 1.河海大学 力学与材料学院,南京 211100 
AuthorInstitution
SHAO Yan-fan 1.College of Mechanics and Materials, Hohai University, Nanjing 211100, China 
WANG Ze-hua 1.College of Mechanics and Materials, Hohai University, Nanjing 211100, China 
LI Xiao 1.College of Mechanics and Materials, Hohai University, Nanjing 211100, China 
LI Jin-long 2.Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315000, China 
GU Chen-yu 1.College of Mechanics and Materials, Hohai University, Nanjing 211100, China 
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中文摘要:
      目的 提高2205双相不锈钢的耐磨性和耐腐蚀性能。方法 采用激光熔覆技术,在2205双相不锈钢基体表面制备钴基合金熔覆层。用X射线衍射仪、光学显微镜检测钴基合金熔覆层的相组成和显微组织,用能谱仪测定熔覆层和基体界面区域的Fe和Cr元素分布,确定熔覆层界面过渡区域的宽度。用显微硬度计和湿砂磨粒磨损试验机,测试熔覆层硬度和耐磨性能。采用扫描电镜观察摩擦表面的磨损特性,分析钴基合金熔覆层的磨损机理。用电化学工作站测试熔覆层的电化学腐蚀特性,并用2205双相不锈钢作为对比试样做相应的性能试验。结果 熔覆层由γ-Co固溶体和少量的Cr7C3、Cr2Ni3化合物相组成,界面处的熔覆层相组织是少量的平面晶和胞状晶,其他区域是发达的树枝晶。由于熔覆层由多道搭接和多层熔覆形成,树枝晶生长有方向性,但不是成固定的方向,并出现明显的分层现象。熔覆层过渡区范围为50 μm左右,熔覆层平均显微硬度达477HV0.1,远高于2205双相不锈钢基体(265HV0.1)。当磨程达到3354 m时,熔覆层的质量损失仅为10.3 mg,约为基体质量损失的1/3。在3.5%NaCl溶液中,熔覆层具有较高的极化电阻与电荷转移电阻和较小的自腐蚀电流。结论 熔覆层组织致密,无气孔、裂纹等缺陷,与基体呈良好的冶金结合,钴基合金熔覆层具有良好的耐磨粒磨损性能和耐腐蚀性能。
英文摘要:
      The paper aims to improve the wear resistance and corrosion resistance of 2205 duplex stainless steel. A cobalt-based alloy coating was prepared on 2205 duplex stainless-steel substrate by laser cladding technology. The phase composition and microstructure of the cobalt-based alloy coating were analyzed with X-ray diffractometer and optical microscope. The element distribution of Fe and Cr in the coating and substrate interface was detected with energy spectrometer, and the width of the transition region was determined. The hardness and abrasive resistance of the coating were tested with microhardness tester and wet sand abrasive wear tester. The wear characteristics of the friction surface were observed under scanning electron microscopy. The wear mechanism of the cobalt-based alloy coating was analyzed. The electrochemical corrosion characteristics of the coating were tested with electrochemical workstation. The comparing tests were conducted to 2205 duplex stainless steel. The coating consisted of γ-Co solid solution and a small amount of Cr7C3, Cr2Ni3 phases. The microstructure of the coating at the interface was composed of cell crystals and a small amount of planar crystals and other regions were of dendrites. Since the coating was formed by multiple layers of cladding, the dendrites of the coating grew in different directions. The transition zone of the coating was very narrow, which was about 50 μm, and the average microhardness of the coating was 477HV0.1, which was far higher than that of 2205 duplex stainless steel matrix. When the wear distance reached 3354 m, the mass loss of the coating was only 10.3 mg, about one third of the mass loss of 2205 duplex stainless steel. In a 3.5% NaCl solution, the coating had a higher polarization resistance and charge transfer resistance and a lower self-corrosion current. The coating is dense, free from pore, crack and other defects, and bonded with the substrate properly. The cobalt-based alloy coating has a much better wear resistance and corrosion resistance.
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