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Journal of Materials Engineering and Performance

, Volume 28, Issue 11, pp 6789–6799 | Cite as

Effect of Electropulsing on Surface Mechanical Behavior and Microstructural Evolution of Inconel 718 during Ultrasonic Surface Rolling Process

  • Zhiyan SunEmail author
  • Yongda Ye
  • Jinbao Xu
  • Timin Hu
  • Shuai RenEmail author
  • Bo LiEmail author
Article
  • 41 Downloads

Abstract

In the current study, the surface mechanical behavior and microstructural evolution of Inconel 718 superalloy processed by the ultrasonic surface rolling process (USRP) and electropulsing-assisted ultrasonic surface rolling process (EP-USRP) were carefully analyzed. The experimental results suggested that after EP-USRP with a frequency of 400 Hz, significant enhancements in Vickers microhardness and nanoindentation hardness were achieved compared to those of USRP specimens, with increases of 13.6 and 9.9%, respectively. Moreover, the machined surface quality, wear resistance, and thermal stability were also improved after EP-USRP (400 Hz). These enhancements in mechanical behavior are closely related to the microstructural evolution induced by electropulsing. Under the coupling of thermal and athermal effects of high-energy electropulsing, the deformation limit of USRP is surpassed and a new balance is achieved between the electropulsing softening effect and the ultrasonic rolling hardening effect. Therefore, further grain refinement, improved plastic deformation ability in the strengthened layer, and the interaction effect between nano-sized precipitates and grain boundaries are probably the main reasons for these results.

Keywords

electropulsing-assisted ultrasonic surface rolling process Inconel 718 superalloy mechanical behavior 

Notes

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringTsinghua UniversityBeijingPeople’s Republic of China
  2. 2.Advanced Materials Institute, Graduate School at ShenzhenTsinghua UniversityShenzhenPeople’s Republic of China
  3. 3.HBIS Group Technology Research InstituteShijiazhuangPeople’s Republic of China

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