Li Kejian, Wu Xu, Chen Liping, Chen Dengming, Zhu Gungjun, Shen Qian, Yoon Jae Hong
School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing 401331, China.
College of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054, China.
Scanning. 2020 Mar 11;2020:5367345. doi: 10.1155/2020/5367345. eCollection 2020.
34CrMo4 steel is widely used for drill stem in oil exploration, because of its excellent properties, such as favorable hardenability, shock absorption, less tendency of temper brittleness, and eminent wear resistance. In this study, the main works are residual stress test and microstructure characterization of 34CrMo4 steel upon various shot peening treatments. The residual stress distribution with effect depth was studied upon the shot peening. Face-to-face paste sample preparation method is required for continuous observation for microstructure evolution of shot-peened specimen from the treat surface to matrix. Grain refinement, lath structure, and precipitates are clearly observed in the gradient deformation layer.
34CrMo4钢因其具有良好的淬透性、减震性、回火脆性倾向小以及卓越的耐磨性等优异性能，在石油勘探钻杆中得到广泛应用。本研究的主要工作是对34CrMo4钢进行各种喷丸处理后的残余应力测试和微观结构表征。研究了喷丸处理后残余应力随影响深度的分布情况。为了从处理表面到基体对喷丸处理试样的微观结构演变进行连续观察，需要采用面对面粘贴试样制备方法。在梯度变形层中清晰地观察到了晶粒细化、板条结构和析出物。
