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.

中文翻译：

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喷丸改性34CrMo4钢残余应力及组织表征

34CrMo4钢由于具有良好的淬透性、减震性、回火脆性倾向小、耐磨性好等优良性能，在石油勘探中被广泛用于钻杆。本研究的主要工作是34CrMo4钢经过各种喷丸处理后的残余应力测试和显微组织表征。研究了喷丸后残余应力随效应深度的分布。连续观察喷丸试样从处理表面到基体的微观结构演变需要面对面的糊状样品制备方法。在梯度变形层中可以清楚地观察到晶粒细化、板条结构和析出物。