Applied Surface Science 442 (2018) 437–445 Contents lists available at ScienceDirect Applied Surface Science journal homepage: www.elsevier.com/locate/apsusc Full Length Article a,b a a,⇑ a a,c a Ai Li , Xing Chen , Chengsong Zhang , Guodong Cui , Hui Zhao , Chuan Yang School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China CRRC Qingdao SiFang Co., Ltd, Qingdao 266111, China article i nfo abstract Article history: In this paper, the gas nitrocarburizing technique was applied for the ﬁrst time to solve the challenge in Received 6 October 2017 crack healing of metallic materials. The crack-healing behavior of 42CrMo steel was investigated. The gas Revised 28 January 2018 nitrocarburizing was carried out in two steps with the decrease of the healing temperature. The mechan- Accepted 18 February 2018 ical properties after healing were measured using the three-point blending test. X-ray diffraction, optical Available online 21 February 2018 microscope and scanning electron microscopy were applied to characterize the phase composition and microstructure of crack healing area and analyze healing mechanisms involved. The results show that Keywords: the optimal healing effect could be obtained when it is healed at
Precambrian Research – Elsevier
Published: May 1, 2018
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