Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (10): 175-179.DOI: 10.13251/j.issn.0254-6051.2020.10.034

• SURFACE ENGINEERING • Previous Articles     Next Articles

Wear and thermal fatigue properties of Ni60A/Cr3C2 coating prepared by PTA welding on H13 steel

Liu Qingyang1,2, Wang Huajun1,2, Hong Feng3, Zhu Chundong1,2, Wang Zhehan1,2   

  1. 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China;
    2. Hubei Engineering Research Center for Green Precision Material Forming, Wuhan University of Technology, Wuhan Hubei 430070, China;
    3. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan Hubei 430070, China
  • Received:2020-03-28 Online:2020-10-25 Published:2020-12-29

Abstract: Ni60A/Cr3C2 surfacing coating was prepared on the surface of H13 steel by plasma transferred arc welding (PTA) technology, and its wear behavior and thermal fatigue properties were investigated. The results of pin-on-disk wear tests at 600 ℃ show that the wear resistance of the Ni-based Cr3C2-reinforced coating, is 2.8 times of that non-reinforced, and 11.6 times of that of the H13 steel. The nickel-based coating can significantly reduce the friction coefficient of H13 steel, and the addition of Cr3C2 will weaken the friction performance of the coating. The main wear mechanism evolves from oxidative wear to abrasive wear and adhesive wear as the wear progresses. The results of thermal fatigue test at 800 ℃ to room temperature show that the fatigue crack reaches 200 μm after 48 thermal cycles for the Ni-based Cr3C2-reinforced coating, earlier than after 62 cycles for the non-reinforced Ni-based coating. High temperature oxidation promotes the initiation of thermal fatigue cracks. The Cr3C2 reinforcing phase is peeled off from the Ni-based substrate, resulting in a decrease in thermal fatigue properties.

Key words: chromium carbide, powder plasma transferred arc welding, wear, thermal fatigue

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