Journal of Northeastern University(Natural Science) ›› 2025, Vol. 46 ›› Issue (5): 54-61.DOI: 10.12068/j.issn.1005-3026.2025.20230299

• Mechanical Engineering • Previous Articles     Next Articles

Surface Strengthening Mechanism of Laser Heat-Assisted Carburizing Grinding of 20CrMnTi

He ZHANG1, Chao-jie LIANG2, Cong SUN1()   

  1. 1.School of Mechanical Engineering & Automation,Northeastern University,Shenyang 110819,China
    2.Beijing Institute of Astronautical Systems Engineering,Beijing 100071,China.
  • Received:2023-11-01 Online:2025-05-15 Published:2025-08-07
  • Contact: Cong SUN

Abstract:

The surface of 20CrMnTi steel with high abrasion resistance has great demands in the manufacturing of core components such as shafts and gears. However, it is hard for the existing surface finishing and strengthening methods to balance productivity and energy consumption. Combining laser micro-carburizing and abrasive processing technology, an efficient and controllable integrated manufacturing method for surface machining and strengthening of 20CrMnTi was proposed: laser heat-assisted carburizing grinding. A series of laser heat-assisted carburizing grinding tests were carried out on an automatic surface grinding machine, and the creation mechanism of enhanced surfaces under laser heat-assistance was analyzed by the metallographic microscope and X-ray diffractometer, etc. At the same time, friction and wear tests were carried out and the mechanical properties of the strengthened surface were tested. The results showed that the surface hardness of laser heat-assisted carburizing 20CrMnTi can reach 550 HV and above, and the wear loss rate is reduced to 50% of the matrix. The grinding heat tempering with phase difference tends to homogenize the strengthening phase, precipitate granular carbides, and achieve diffuse strengthening. The proposed method can help and realize the high-performance manufacturing of low-carbon steel surfaces.

Key words: 20CrMnTi, laser heat-assisted carburizing grinding, abrasion resistance, surface hardness, tempering

CLC Number: