文章摘要
邓操,王越,袁铁锤,等.TiB2含量对17-4PH钢熔覆层组织及性能的影响[J].精密成形工程,2021,13(2):42-47.
DENG Cao,WANG Yue,YUAN Tie-chui,et al.Effect of TiB2 Content on Structure and Properties of 17-4PH Steel Cladding Layer[J].Journal of Netshape Forming Engineering,2021,13(2):42-47.
TiB2含量对17-4PH钢熔覆层组织及性能的影响
Effect of TiB2 Content on Structure and Properties of 17-4PH Steel Cladding Layer
投稿时间:2021-01-23  
DOI:10.3969/j.issn.1674-6457.2021.02.007
中文关键词: 17-4PH  TiB2  激光熔覆  组织  性能
英文关键词: 17-4PH  TiB2  laser melting  microstructure  properties
基金项目:国家自然科学基金(51571214)
作者单位
邓操 中南大学 粉末冶金国家重点实验室长沙 410083 
王越 中南大学 粉末冶金国家重点实验室长沙 410083 
袁铁锤 中南大学 粉末冶金国家重点实验室长沙 410083 
李瑞迪 中南大学 粉末冶金国家重点实验室长沙 410083 
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中文摘要:
      目的 选择合适的TiB2添加量以提高17-4PH钢熔覆层的综合性能。方法 采用金属粉末注射成形技术制备17-4PH基体,在基体上通过激光熔覆含有不同质量分数TiB2(0.5%,1%,2%,3%,4%)的混合粉末制备样品,分析其物相及组织,测试材料显微硬度,并进行摩擦磨损与电化学腐蚀实验。通过对样品进行耐磨性与耐腐蚀性的实验,确定最佳TiB2添加量。结果 发现熔覆层与基体均为单相α-Fe,激光熔覆层与基体结合紧密,晶粒尺寸减小,孔隙率降低。TiB2的加入会引起熔覆层元素偏析,随着TiB2含量的增加,硬度先增大后减小。与基体相比,熔覆层的耐磨性能有显著提高,其磨损率随TiB2含量的增加而升高,耐腐蚀性随TiB2含量的增加而降低。当TiB2的质量分数为1%时,显微硬度最高可达626.6HV,磨损率为0.1341×104 mm3/(N.m)。结论 通过在熔覆层中添加适量的TiB2可以提升17-4PH钢的综合性能,当TiB2的质量分数为1%时,材料具有最佳的力学性能和相对较好的耐腐蚀性能。
英文摘要:
      The work aims to select an appropriate amount of TiB2 to improve the overall performance of the 17-4PH steel cladding layer. The 17-4PH matrix was prepared by metal powder injection molding technology (MIM), and the samples were prepared by laser cladding mixed powder containing different mass fractions of TiB2 (0.5%, 1%, 2%, 3%, 4%) on the matrix. The phase and structure of the samples were analyzed and the microhardness of the material was tested. Through the experiment of the wear resistance and corrosion resistance of the samples, the optimal TiB2 addition amount was determined. It was found that both the cladding layer and the substrate were single-phase α-Fe. The laser cladding layer and the substrate were tightly bonded. The grain size and the porosity were reduced. The addition of TiB2 would cause element segregation in the cladding layer. As the content of TiB2 increased, the hardness first increased and then decreased. Compared with the matrix, the wear resistance of the cladding layer was significantly improved, and the wear rate increased with the increase of TiB2 content; and the corrosion resistance decreased with the increase of TiB2 content. When the amount of TiB2 added was 1%, the microhardness could reach up to 626.6HV, and the wear rate was 0.1341×10−4 mm3/(N.m). It can be concluded from the analysis that the overall performance of 17-4PH steel can be improved by adding an appropriate amount of TiB2 to the cladding layer. When the addition amount of TiB2 is 1%, the material has the best mechanical properties and relatively good corrosion resistance.
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