东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (8): 1133-1136.DOI: -

• 论著 • 上一篇    下一篇

脉冲激光熔覆高速钢粉末涂层的微结构与裂纹抑制

许妮君;刘常升;商硕;王政一;   

  1. 东北大学材料各向异性与织构教育部重点实验室;利物浦大学工程系;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(51074050)

Microstructure and crack suppression of HSS powder cladding by pulse laser

Xu, Ni-Jun (1); Liu, Chang-Sheng (1); Shang, Shuo (2); Wang, Zheng-Yi (1)   

  1. (1) Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China; (2) Department of Engineering, University of Liverpool, Liverpool L693GQ, United Kingdom
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Liu, C.-S.
  • About author:-
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摘要： 采用Nd∶YAG脉冲激光器对预置了高速钢粉末的球墨铸铁基体进行激光熔覆处理.单道实验得到优化后的高速钢激光熔覆工艺参数为:电流240A、扫描速度3.0 mm/s、离焦量13 mm、预置涂层厚度0.5mm、激光脉冲频率15Hz、脉宽3.0ms.多道搭接实验结果表明,制备的熔覆层组织致密,与基体形成了冶金结合,主要强化相为WC1-x和V4C3,有裂纹存在.熔覆层平均显微硬度为600HV,最高达到682HV,约为基体(300HV)的2.3倍.添加50%Ni60自熔性合金,有效控制了熔覆层裂纹数量,显微硬度略有降低,最高为637HV,约为基体的2.1倍.

关键词: 脉冲激光熔覆, 高速钢粉末, 球墨铸铁, 微结构, 硬度

Abstract: The laser cladding of high speed steel (HSS) powders on nodular cast iron rolls was carried out using Nd:YAG pulse laser. The optimized laser processing parameters obtained through single-path cladding experiments are as follows: the electric current is 240 A, the scanning velocity 3 mm/s, the defocus amount 13 mm, the thickness of cladding layer 0.5 mm, the frequency 15 Hz and the impulse width 3.0 ms. Based on the parameters mentioned above, multi-path overlapping cladding experiments were conducted. The results show that the cladding is bonded metallurgically to the substrate, with some cracks in the layer observed, and the main strengthening phases are WC1-x and V4C3. The average microhardness of the cladding was 600 HV with the maximum up to 682 HV, which was about 2.3 times as high as that of the substrate. Adding 50% Ni60 to HSS powders reduced the crack numbers effectively, while the microhardness decreased to 637 HV, about 2.1 times as high as that of the substrate.

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