韩彬,胡春阳,韩伟,贾晨昕,张琪,苏成明,李美艳,曹鹏.丝粉协同高速激光熔覆不锈钢层组织性能研究[J].表面技术,2022,51(5):15-23, 39.
HAN Bin,HU Chun-yang,HAN Wei,JIA Chen-xin,ZHANG Qi,SU Cheng-ming,LI Mei-yan,CAO Peng.Microstructure and Properties of Stainless Steel Coatings by Coincident Wire-powder High Speed Laser Cladding[J].Surface Technology,2022,51(5):15-23, 39
丝粉协同高速激光熔覆不锈钢层组织性能研究
Microstructure and Properties of Stainless Steel Coatings by Coincident Wire-powder High Speed Laser Cladding
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.05.002
中文关键词:  丝粉协同  高速激光熔覆  17-4PH不锈钢  B4C  Cr3C2  组织结构  显微硬度  耐蚀性
英文关键词:coincident wire-powder  high speed laser cladding  17-4PH  B4C  Cr3C2  microstructure  microhardness  corrosion resistance
基金项目:国家自然科学基金项目(51771228);中石油重大科技合作项目(ZD2019–184–004);中央高校基本科研业务费资助(20CX05009A)
作者单位
韩彬 中国石油大学华东材料科学与工程学院,山东 青岛 266580 
胡春阳 中国石油大学华东材料科学与工程学院,山东 青岛 266580 
韩伟 中国石油四川石化有限责任公司,成都 611930 
贾晨昕 中国石油大学华东材料科学与工程学院,山东 青岛 266580 
张琪 中国石油大学华东材料科学与工程学院,山东 青岛 266580 
苏成明 陕西天元智能再制造股份有限公司,西安 710018 
李美艳 中国石油大学华东材料科学与工程学院,山东 青岛 266580 
曹鹏 陕西天元智能再制造股份有限公司,西安 710018 
AuthorInstitution
HAN Bin School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China 
HU Chun-yang School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China 
HAN Wei PetroChina Sichuan Petrochemical Company Limited, Chengdu 611930, China 
JIA Chen-xin School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China 
ZHANG Qi School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China 
SU Cheng-ming Shaanxi Tianyuan Intelligent Remanufacturing Co., Ltd., Xi'an 710018, China 
LI Mei-yan School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China 
CAO Peng Shaanxi Tianyuan Intelligent Remanufacturing Co., Ltd., Xi'an 710018, China 
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中文摘要:
      目的 探究海洋工程装备表面高效高质量强化及改性新技术,提高17-4PH不锈钢层制备效率及综合性能。方法 采用高速激光熔覆技术制备17-4PH丝材、17-4PH丝材协同B4C粉末及17-4PH丝材协同Cr3C2粉末3种熔覆层。通过X射线衍射仪、扫描电镜及能谱仪等仪器分析熔覆层的组织结构。利用显微硬度计及电化学工作站测试熔覆层的硬度及耐蚀性。结果 17-4PH丝材熔覆层主要为α相(马氏体),而2种丝粉协同熔覆层的相结构除α相(马氏体)外还出现γ相(奥氏体)。3种熔覆层组织及成分整体均匀,丝粉协同熔覆层晶界出现Cr、Nb等碳化物析出,表层分布碳化物颗粒。碳化物颗粒的添加提高了熔覆层硬度,尤其是B4C颗粒,其作为硬质相来增强熔覆层,在均匀细化晶粒的同时使得晶界和晶内析出大量第二相颗粒,硬度较未添加碳化物颗粒的17-4PH丝材熔覆层提升约35.53%。3种熔覆层在3.5%NaCl溶液中的耐腐蚀性均较好,尤其是协同添加Cr3C2颗粒的熔覆层,相较于17-4PH丝材熔覆层,其腐蚀电流密度由0.592 400 μA/cm2降低至0.014 094 μA/cm2,腐蚀电位由–0.314 05 V提高至–0.134 64 V。结论 在40 mm/s的熔覆速度下,使用协同预热的焊丝与同轴送进的粉末,高效高质量制备了不锈钢层,充分结合了热丝熔覆效率高及送粉熔覆成分易调节等优点。相较于17-4PH丝材熔覆层,2种丝粉协同熔覆层的物相均除α相外出现了γ相,碳化物的添加细化了组织,且晶界有新的析出相。17-4PH丝材协同B4C粉末熔覆层硬度显著提高,而17-4PH丝材协同Cr3C2粉末熔覆层在3.5%NaCl溶液中的耐蚀性明显提升。
英文摘要:
      In order to explore the new technology of high-efficiency and high-quality surface strengthening and modification of offshore engineering equipment, and improve the preparation efficiency and comprehensive performance of 17-4PH stainless steel layer. Three cladding layers of 17-4PH wire, 17-4PH wire with B4C powder and 17-4PH wire with Cr3C2 powder were prepared by high-speed laser cladding technology. The microstructure of the cladding layer was analyzed by X-ray diffraction, scanning electron microscope and energy dispersive spectrometer. The hardness and corrosion resistance of the cladding layer were tested by microhardness tester and electrochemical workstation. The results show that the cladding layer of 17-4PH wire is mainly α phase (martensite), and the two kinds of silk powder cooperate with the phase structure of the cladding layer α in addition to phase (martensite), it also appears γ phase (austenite); The microstructure and composition of the three cladding layers are uniform as a whole. Carbide precipitation such as Cr and Nb appears at the grain boundary of the wire powder cooperative cladding layer, and carbide particles are distributed on the surface layer; The addition of carbide particles improves the hardness of the cladding layer, especially the addition of B4C particles. It not only acts as a hard phase reinforced cladding layer to uniformly refine the grains, but also precipitates a large number of second phase particles at the grain boundary and in the crystal. The hardness is about 35.53% higher than that of the 17-4PH wire cladding layer without carbide particles; The corrosion resistance of the three cladding layers in 3.5wt.%NaCl solution is good, especially the cladding layer with Cr3C2 particles added together. Compared with the 17-4PH wire cladding layer, the corrosion current density is 0.592 400 μA/cm2 reduced to 0.014 094 μA/cm2, the corrosion potential increased from –0.314 05 V to –0.134 64 V. In this paper, the stainless steel layer is prepared with high efficiency and high quality with the co preheated welding wire and coaxial powder at the cladding speed of 40 mm/s, which fully combines the advantages of high hot wire cladding efficiency and easy adjustment of powder feeding cladding composition; Compared with the 17-4PH wire cladding layer, the phases of the two silk powder cooperative cladding layers are eliminated α out of phase γ. The addition of carbide refines the structure, and there are new precipitates at the grain boundary; The hardness of 17-4PH wire and B4C powder cladding layer is significantly improved, while the corrosion resistance of 17-4PH wire and Cr3C2 powder cladding layer in 3.5wt.% NaCl solution is significantly improved.
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