Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (2): 208-212.DOI: 10.12068/j.issn.1005-3026.2016.02.013

• Mechanical Engineering • Previous Articles     Next Articles

Transformation Mechanism of Microstructure in Hardening Layer Under the PSHG

SHI Xiao-liang, LIU Ming-he, ZHANG Xiu-ming, XIU Shi-chao   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2014-12-09 Revised:2014-12-09 Online:2016-02-15 Published:2016-02-18
  • Contact: SHI Xiao-liang
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Abstract: In order to study the features of surface hardening layer and the formation and variation mechanism of metallographic structure under pre-stressed hardening grinding (PSHG), the 45 steel was processed with the PSHG experiment. The surface hardening layer with little residual stress was obtained from it. The surface hardness was measured and its metallographic structure was observed. Combining experimental result with the simulation of grinding temperature field, we studied how the pre-stress influenced the metallographic structure such as martensite. It is shown that the high temperature in the grinding process largely weakens the yield limit of 45 steel. A smaller pre-stress would result in plastic deformation. The parent-phase-hardening and strain-inducing-phase-changing resulting from plastic deformation have comprehensive effect on the martensitic phase transformation. This indicates that the pre-stress restrains the phase transformation firstly and then promotes it.

Key words: grinding-hardening, temperature field, simulation, pre-stress, mechanism of phase transformation

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