Residual Stress and Microstructure Characterization of 34CrMo4 Steel Modified by Shot Peening

Kejian Li; Xu Wu; Liping Chen; Dengming Chen; Gungjun Zhu; Qian Shen; Jae Hong Yoon

doi:10.1155/2020/5367345

Residual Stress and Microstructure Characterization of 34CrMo4 Steel Modified by Shot Peening

Scanning. 2020 Mar 11:2020:5367345. doi: 10.1155/2020/5367345. eCollection 2020.

Authors

Kejian Li¹, Xu Wu¹, Liping Chen¹, Dengming Chen¹, Gungjun Zhu¹, Qian Shen², Jae Hong Yoon^{1

3}

Affiliations

¹ School of Metallurgy and Materials Engineering, Chongqing University of Science & Technology, Chongqing 401331, China.
² College of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054, China.
³ School of Nano & Advanced Materials Engineering, Changwon National University, Changwon 51140, Republic of Korea.

Abstract

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.