Effects of Pulsed Current on Microstructure and Properties of Crack Tip in Remanufacturing Blank

Dewei Deng, Qianqian Liu, Xiaona Li, Tao Yu, Lin Zhang, Gang Wang, Hongchao Zhang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A high energy pulsed current impacting device was used to treat 316 austenitic stainless steel containing prefabricated unilateral fatigue crack aiming for remanufacturing. The influence of high density pulsed current on the microstructure at crack tip was investigated by metallographic microscope, X-ray diffraction, electron backscattered diffraction (EBSD) and transmission electron microscope (TEM). And the evolution of microstructure during melting treatment was analyzed. Results show that the structure at crack tip is obviously refined after the pulsed current processing, and the gradient structure including the columnar crystal area, recrystallization zone and matrix is observed. Due to the rapid heating and cooling, the generation of high-speed electronic wind and electrically induced plasticity effect reduce the thermodynamic barrier of recrystallization or phase change. Thus, the rate of nucleation is increased, and the grain growth process is inhibited. Therefore the grain size of recrystallization zone is smaller than that of the matrix, and hence the mechanical properties of materials are improved.

Original languageEnglish
Pages (from-to)2208-2213
Number of pages6
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume46
Issue number8
StatePublished - Aug 1 2017

Keywords

  • Pulsed current
  • Recrystallization
  • Remanufacturing
  • Structure refinement

Fingerprint Dive into the research topics of 'Effects of Pulsed Current on Microstructure and Properties of Crack Tip in Remanufacturing Blank'. Together they form a unique fingerprint.

Cite this