王旭,邓霞,夏春阳,杜开平,于月光.送粉法激光熔覆工艺对不锈钢熔覆层 微观组织结构与性能的影响[J].热喷涂技术,2021,13(2):17~27.
送粉法激光熔覆工艺对不锈钢熔覆层 微观组织结构与性能的影响
The Influence of Powder Feeding Laser Cladding Processon the Microstructure and Properties of Stainless-Steel Cladding Layer
  
DOI:10.3969/j.issn.1674-7127.2021.02.003
中文关键词:  送粉法激光熔覆  工艺参数  熔覆层性能  微观组织结构
英文关键词:Powder feeding method laser cladding  Process parameters  Cladding layer performance  Microstructure
基金项目:
              
作者单位
王旭 矿冶科技集团有限公司, 特种涂层材料与技术北京市重点实验室
邓霞 矿冶科技集团有限公司, 特种涂层材料与技术北京市重点实验室
夏春阳 矿冶科技集团有限公司, 特种涂层材料与技术北京市重点实验室
杜开平 矿冶科技集团有限公司, 特种涂层材料与技术北京市重点实验室
于月光 特种涂层材料与技术北京市重点实验室,中国钢研科技集团有限公司
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中文摘要:
      本文研究了送粉法激光熔覆条件下, 最优化的激光熔覆工艺窗口及其对熔覆层性能的影响。 结果表明, 对于粒 度范围为 53~150 μm 的球形不锈钢粉, 送粉法激光熔覆的最优化的工艺窗口为: 功率 2600 W、 扫描速度 8 mm/s、 熔 覆层厚度 2.0 mm、 搭接率 50%。 在此条件下熔覆层显微硬度最高可达 721.68 HV0.2, 为基体硬度的 3.7 倍。 熔覆层组 织由平面晶、 胞状枝晶及胞晶组成, 晶粒大小随激光能量密度而变化, 粉末由 α-Fe、 γ-Fe、 M23(B,C)6 相组成, 而熔覆 层中 γ-Fe 相几乎消失并转变为马氏体相。 摩擦磨损试验表明, 熔覆层的摩擦系数均低于基体, 说明耐磨性提高。
英文摘要:
      In this study, the optimal process and its effect on the properties of laser cladding layer with powder feeding methods were investigated. For spherical stainless-steel powder with particle size range of 53~150 μm, the optimized process parameters is that the power of 2600 W, the scanning speed of 8 mm/s, the thickness of 2.0 mm and the lap rate of 50%. Under the optimized process parameters, the microhardness of the cladding layer can reach up to 721.68HV0.2, which was 3.7 times as the substrate. The microstructure of the cladding layer was composed of planar crystal, cellular dendrite and cellular crystal. The grain size varied with the laser energy density. The phases of powder were α-Fe, γ-Fe and M23(B,C)6. The phase of γ-Fe almost disappeared and turned to the Martensite in the cladding layer. Friction and wear-test showed that the friction coefficient of the cladding layer was lower than that of the substrate, which indicates the improvement of wear resistance.
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