表面技术2017，Vol.46Issue(2)：224-228,5.DOI:10.16490/j.cnki.issn.1001-3660.2017.02.038
表面状态对疲劳塑性变形局部化的影响
Effect of Surface States on Fatigue Plastic Deformation Localization
摘要
Abstract
The work aims to study influence of different surface states on plastic deformation localization of WaspaloyTM Ni-base superalloy, and determine optimal three-dimensional surface roughness parameters of evaluating plastic stress localiza-tion. WaspaloyTM nickel-base superalloy was polished to 0.02μm, and then electrolytic polishing and chemical etching were carried out respectively to obtain two different surface states. Fatigue life was obtained by performing fatigue test to standard sample fabricated for this purpose, and surface morphology and crack initiation of WaspaloyTM nickel-base superalloy were in-vestigated by using atomic force microscopy, scanning electron microscopy and 3D surface profiler. Quality of the electrolytic polished surface was better. 3D surface roughness Sa (surface arithmetic mean deviation) was 0.001μm and 0.018μm respec-tively, and 0.024μm and 0.026μm respectively after the fatigue test. The surface roughness Sp (surface maximum peak height) was 0.131μm. Fatigue life of the sample subject to chemical etching and electrochemical polishing was 800 and 700 respec-tively. The fatigue cracks on the sample subject to chemical etching and electrochemical polishing started from the slip bands and extended along the slip bands. The initial surface state has affects fatigue life of the material; three dimensional surface roughness parameter Sp is the best description of material fatigue plastic deformation localization, of which critical value reveals the crack initiation of the material.关键词
WaspaloyTM高温镍基合金/表面粗糙度/滑移带/塑性应变局部化Key words
WaspaloyTMsuperalloy/surface roughness/slip band/plastic deformation localization分类
矿业与冶金引用本文复制引用
谢俊峰,何声馨,李大磊,李延民,张二亮..表面状态对疲劳塑性变形局部化的影响[J].表面技术,2017,46(2):224-228,5.基金项目
河南省高等学校重点科研项目(15A460030)Supported by the Key Scientific Research Projects of Henan Province. （15A460030）
