董会,郭鹏飞,徐龙,康凯祥.热处理温度对高速激光熔覆Ni/316L涂层组织及摩擦磨损性能的影响[J].表面技术,2022,51(5):111-120.
DONG Hui,GUO Peng-fei,XU Long,KANG Kai-xiang.Effect of Heat Treatment Temperature on Microstructure and Friction and Wear Properties of High-speed Laser Cladded Ni/316L Coating[J].Surface Technology,2022,51(5):111-120
热处理温度对高速激光熔覆Ni/316L涂层组织及摩擦磨损性能的影响
Effect of Heat Treatment Temperature on Microstructure and Friction and Wear Properties of High-speed Laser Cladded Ni/316L Coating
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.05.012
中文关键词:  热处理  高速激光熔覆  Ni/316L涂层  海洋环境  摩擦磨损
英文关键词:heat treatment  high-speed laser cladding  Ni/316L coating  marine environment  friction and wear
基金项目:陕西省自然科学基金(2020JM540);西安交通大学金属材料强度国家重点实验室项目(20202210);西安石油大学《材料科学与工程》省级优势学科项目(YS37020203);西安石油大学研究生创新与实践能力培养计划资助项目(YCS20212124)
作者单位
董会 西安石油大学 材料科学与工程学院 西安市高性能油气田材料重点实验室,西安 710065 
郭鹏飞 西安石油大学 材料科学与工程学院 西安市高性能油气田材料重点实验室,西安 710065 
徐龙 西安石油大学 材料科学与工程学院 西安市高性能油气田材料重点实验室,西安 710065 
康凯祥 西安石油大学 材料科学与工程学院 西安市高性能油气田材料重点实验室,西安 710065 
AuthorInstitution
DONG Hui Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China 
GUO Peng-fei Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China 
XU Long Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China 
KANG Kai-xiang Xi'an Key Laboratory of High Performance Oil and Gas Field Materials, School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China 
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中文摘要:
      目的 研究海水腐蚀环境中热处理温度对高速激光熔覆Ni/316L涂层耐磨性能的提升作用。方法 采用高速激光熔覆设备在Q235钢表面制备Ni/316L涂层,分别在650、700、750、800 ℃下热处理1.5 h,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)对Ni/316L熔覆层微观组织结构和相组成进行表征,通过硬度测试和模拟海洋环境摩擦磨损试验,分析热处理温度对Ni/316L熔覆层硬度与耐磨性能的影响。结果 Ni/316L熔覆层厚度约为2 mm,过渡层约为50 μm。熔覆态涂层晶粒包含枝状晶和等轴晶。随热处理温度升高,涂层等轴晶数量先增加、后减少,第二相含量先升高、后降低,熔覆层硬度先升高、后降低。在750 ℃时,熔覆层硬度达到最高,约为熔覆态涂层硬度的2.4倍。热处理后的4种熔覆层的摩擦系数约为0.31,稍低于熔覆态涂层摩擦系数(0.33)。熔覆态涂层的磨损率比750 ℃热处理的涂层约高5倍。5种涂层均以磨粒磨损为主。结论 改变热处理温度可以改变高速激光熔覆Ni/316L涂层的组织结构和第二相的数量,进而影响其硬度与耐磨性,但是热处理温度过高会导致晶粒组化等问题。因此,高速激光熔覆Ni/316L涂层的热处理温度应控制在750 ℃以下。
英文摘要:
      The effect of heat treatment temperature on the wear resistance of high-speed laser cladded Ni/316L coatings in seawater corrosive environment was illustrated in this case. Ni/316L coatings were prepared on the surface of Q235 steel by high-speed laser cladding equipment, and heat-treated at 650, 700, 750 ℃, and 800 ℃ for 1.5 h, respectively. X-ray diffraction (XRD), scanning electron microscope (SEM) The microstructure and phase composition of the Ni/316L cladding layer were characterized by energy dispersive spectrometer (EDS). In addition, the effect of heat treatment temperature on the hardness and the wear resistance of the Ni/316L cladding layer was analyzed via hardness test and wear test in a simulated marine environment. The thickness of as-cladded layer is about 2 mm, and the transition layer is about 50 μm. The cladding layer has the characteristics of compactness, low porosity and crack free. The cladding coating grains contain dendrites and equiaxed grains. With the increase of heat treatment temperature, the number of equiaxed crystal in the coating first increased and then decreased, similar to that of the new phase content, the second phase content first increased and then decreased. Correspondingly, as the heat treatment temperature increased, the grain size of the cladding layer decreased first and then increased, resulting in the hardness of the cladding layer increased first and then decreased. The hardness of the cladding layer reached the highest value at 750 ℃, which was about 2.4 times that of the as-cladded coating. It was found that the friction coefficient of the four cladding layers after heat treatment is about 0.31, which is slightly lower than that of the cladding coating (0.33). The wear rate of the as-cladded coating was about 5 times higher than that of the coating heat-treated at 750 ℃. Under the high load of 200 N, the coating surface was plastically deformed, and the wear debris and particles after cutting enter into the sliding friction, resulting in cutting effect intensified, forming a valgus morphology caused by furrows and plastic deformation. The seawater is corrosive, and the stainless steel coating first forms a passivation film in seawater, which will be destroyed and will intensify corrosion and lead to crack expansion. On the other hand, the resistance of GCr15 steel in seawater the corrosion resistance is poor. The products after rapid corrosion formed abrasive particles during sliding friction, which enter the coating and the friction pair to produce three-body wear. As a result, the particles has a continuous cutting effect on the cladding layer. 5 kinds of coatings wear mechanisms are mainly the abrasive wear. The four different heat treatment processes all could improve the wear resistance of the cladding layer, while C shows a better wear resistance. The°the coating heat-treated at 750 ℃microstructure and the number of second phases of the high-speed laser cladding Ni/316L coating changes with the heat treatment temperature. However, the high temperature leads to some problems, such as grain growth. Therefore, the heat treatment temperature of the high-speed laser cladding Ni/316L coating should be controlled below 750 ℃.
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