• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

机械工程学报 ›› 2015, Vol. 51 ›› Issue (12): 63-68.doi: 10.3901/JME.2015.12.063

• 材料科学与工程 • 上一篇    下一篇

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GH4169合金磨削表面塑性变形层的微观结构

杜随更1, 姜 哲1, 张定华1, 汪志斌2, 李娜1   

  1. 1.西北工业大学现代设计与集成制造技术教育部重点实验室;
    2.西安应用光学研究所
  • 出版日期:2015-06-20 发布日期:2015-06-20
  • 基金资助:
    国家自然科学基金资助项目(51175430)

Microstructure of Plastic Deformation Layer on Grinding Surface of GH4169 Alloy

DU Suigeng1, JIANG Zhe1, ZHANG Dinghua1, WANG Zhibin2, LI Na1   

  1. 1.Key Laboratory of Contemporary Design and Integrated Manufacturing Technology of Ministry of Education, Northwestern Polytechnical University, Xi’an 710072;
    2.Xi’an Institute of Applied Optics, Xi’an 710065
  • Online:2015-06-20 Published:2015-06-20

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摘要： 采用光学显微镜、透射电子显微镜和高分辨透射电子显微镜对航空发动机常用高温合金GH4169磨削表面变质层的微观组织结构进行研究。结果表明，GH4169合金磨削表面及亚表面发生了局部剧烈塑性变形，在表面变质层内形成了剧烈塑性变形层(Severe plastic deformation layer，SPDL)。通过分析选区电子衍射图特征，确定出本试验条件下磨削表面塑性变形层的深度略大于2.2 μm。根据组织特点，磨削表面的SPDL进一步可分为表面非晶层、微观剪切带和纳米晶层。表面非晶层最靠近外表面，其内主要为非晶组织和高密度的空位，但仍存在一定量的直径为1～3 nm的有序结构。微型剪切带是位于表面非晶层和纳米晶层之间、平行于磨削表面、宽度约2 nm的一条带状区域，其内组织已经完全非晶化，不存在有序结构。纳米晶层紧邻基体，主要是直径为10～150 nm的纳米晶粒，纳米晶粒内部原子排列基本有序，但仍存在大量的晶格缺陷，主要为非晶化、位错、层错和孪晶。

关键词: GH4169合金, 非晶组织, 磨削表面, 塑性变形, 微观组织

Abstract: In order to improve the grinding surface integrality of the superalloy GH4169, which usually be used in the aero-engine, the metamorphic layer is investigated by optical microscope, transmission electron microscopy(TEM) and high resolution transmission electron microscopy(HRTEM). The results show that, the severe localized plastic deformation occurred on the grinding surface and subsurface, and a severe plastic deformation layer(SPDL) is formed in the metamorphic layer. Under the experimental conditions, the depth of surface plastic deformation layer is slightly larger than 2.2 μm. According to the microstructure characteristics, SPDL is further divided into three layers: the surface amorphous layer(SAL), the micro-shear band(MSB) and the nanocrystalline layer(NCL). SAL is adjacent to the grinding surface, its microstructure is almost amorphous and contains many vacancies. There are still a certain amount of ordered structures with diameter of 1-3 nm in SAL. MSB is located between SAL and NCL, parallel with the grinding surface and a strip with width of 2 nm. MSB is amorphous completely and has no ordered structure. NCL is close to matrix, mainly consists of nanometer grains with diameter of 10-150 nm. Inside the nanometer grains, there are large amounts of crystal defects, such as amorphizations, dislocations, stacking fault and twins.

Key words: amorphous microstructure, GH4169 alloy, grinding surface, microstructure, plastic deformation

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