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Improvement of microstructure and surface behaviors of welded S50C steel components under electropulsing assisted ultrasonic surface modification

Published online by Cambridge University Press:  05 April 2016

Yongda Ye
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China, Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Jie Kuang
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China, Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Song-Zhu Kure-Chu
Affiliation:
Department of Chemistry and Bioengineering, Iwate University, Iwate 020-8550, Japan
Guolin Song
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China
Zhiyan Sun
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China, Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Guoyi Tang*
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China, Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
*
a) Address all correspondence to this author. e-mail: tanggy@mail.sz.tsinghua.edu.cn
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Abstract

The effect of electropulsing assisted ultrasonic surface modification (EUSM) on microstructure and surface properties of S50C steel welded components is investigated. Compared with conventional ultrasonic surface modification (USM) process, EUSM process achieves significant improvements in microstructure, including deeper strengthened layers and gradient microstructure on the surface. The EUSM-induced microstructure results in higher levels of surface compressive residual stress and greater surface microhardness and its effective depth. Conventional USM process is inevitably accompanied by some plastic damages, such as pit and crack defects. The damages, however, can be eliminated to some extent during the EUSM process. These enhancements may be attributed to the thermal and athermal effects caused by electropulsing treatment, which accelerates the mobility of dislocations in the dynamic recrystallization process.

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Copyright
Copyright © Materials Research Society 2016 

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