金属热处理 ›› 2020, Vol. 45 ›› Issue (7): 28-31.DOI: 10.13251/j.issn.0254-6051.2020.07.006

• 工艺研究 • 上一篇    下一篇

深冷处理对K6509钴基合金表面性能的影响

王兴富1,2, 李永刚1,2,3, 雷达1,2, 师佑杰1,2, 李学楠1,2   

  1. 1. 太原理工大学 机械与运载工程学院, 山西 太原 030024;
    2. 太原理工大学 精密加工山西重点实验室, 山西 太原 030024;
    3. 太原理工大学 山西省金属材料腐蚀与防护工程技术研究中心, 山西 太原 030024
  • 收稿日期:2019-01-13 出版日期:2020-07-25 发布日期:2020-09-07
  • 通讯作者: 李永刚, 副教授, 博士, E-mail:liyonggang_tyut@126.com
  • 作者简介:王兴富(1994—), 男, 硕士研究生, 主要研究方向为精密零件表面光整加工, E-mail:1129514273@qq.com。
  • 基金资助:
    国家自然科学基金(51705352);中国博士后科学基金(2018M641682);山西省高等学校科技创新项目(2019L0139)

Effect of cryogenic treatment on surface properties of K6509 Co-based alloy

Wang Xingfu1,2, Li Yonggang1,2,3, Lei Da1,2, Shi Youjie1,2, Li Xuenan1,2   

  1. 1. School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
    2. Shanxi Key Laboratory of Precision Machining, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
    3. Engineering and Technology Research Center for Metal Material Corrosion and Protection of Shanxi Province, Taiyuan University of Technology, Taiyuan Shanxi 030024, China
  • Received:2019-01-13 Online:2020-07-25 Published:2020-09-07

摘要: 研究了K6509钴基合金样品在-196 ℃液氮中分别深冷24 h和48 h后的表面性能变化,并与未深冷样品进行对比。通过显微组织分析、XRD成分分析、硬度分析等技术手段研究了深冷处理对钴基合金表面性能的影响,并分析了深冷处理和滚磨光整加工后表面粗糙度和形貌的变化。结果表明:钴基合金在深冷处理24 h时,有部分碳化物发生粗化,同时伴随着细小碳化物析出,深冷48 h时细小碳化物减少,碳化物粗化现象消失,显微组织变得均匀;通过XRD图谱发现,深冷过程中相组成没有发生变化,但含M27C6碳化物的共晶相和含M7C3碳化物的共晶相出现峰移现象,M27C6碳化物相衍射峰强度发生明显变化;延长深冷时间能够显著提高硬度,深冷48 h硬度提高了17.6%;选择合理的深冷时间与滚磨光整加工相结合能显著提高表面质量,经深冷48 h+滚磨光整处理后,表面粗糙度下降最多,Ra由1.215 μm降到0.662 μm,其表面缺陷明显减少,表面一致性好。

关键词: 钴基合金, 深冷处理, 表面形貌, 显微组织, 碳化物, XRD

Abstract: Surface properties of K6509 Co-based alloy specimens cryogenic treated by -196 ℃ liquid nitrogen for 24 h and 48 h were studied and compared with non-cryogenic specimens by means of microstructure analysis, XRD component analysis and hardness analysis, and the changes of surface roughness and morphologies after cryogenic treatment and rolling polishing were analyzed. The results show that some of the carbides in Co-base alloy are roughened and the fine carbides are precipitated after 24 h cryogenic treatment, but after 48 h cryogenic treatment, the fine carbide decreases, the carbide coarsening disappears, and the microstructure becomes uniform. The XRD patterns show that the phase composition does not change during the cryogenic process, but the peak value shift at the eutectic phase containing M27C6 carbide and the eutectic phase containing M7C3 carbides, and the diffraction peak intensity of the M27C6 carbides changes significantly. The hardness is significantly increased by prolonging the cryogenic time, and the hardness is increased by 17.6% after 48 h cryogenic treatment. The combination of reasonable cryogenic time and rolling polishing can significantly improve the surface quality. After 48 h cryogenic treatment and rolling polishing, the surface roughness decreases the most, and the Ra value decreases from 1.215 μm to 0.662 μm, and the surface defects are significantly reduced and the surface consistency is well.

Key words: Co-based alloy, cryogenic treatment, surface morphology, microstructure, carbide, XRD

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