Abstract
To improve the cutting performance, the red hardness and wear resistance of M2 high-speed steel, as well as expand the application field, in this work, a coating was fabricated via plasma cladding on M2 high-speed steel using Ni, Cr and Cu alloy elements as precursor materials. The distribution and composition of alloying elements, microhardness and wear resistance of the coating were studied. The results show that the NiCrCu cladding layer contains many types of carbides. The secondary hardening caused by the dispersion of carbides can significantly improve the hardness, red hardness and wear resistance of material. The hardness of cladding layer is above 950 HV, after holding at 600 °C for 4 h, the hardness is above 932 HV. The alloy elements are evenly distributed, but, due to the rapid solidification after the cladding, there are composition fluctuations in the longitudinal direction. The wear resistance of the cladding layer is excellent; the wear rate is reduced from 1.75 to 1.44 × 10−6 mm3 N−1 m−1 or less; and the wear mechanism is a combination of abrasive wear and adhesive wear.
Highlights
High-speed steels have excellent hardness and wear resistance even at elevated temperatures, and are widely used in cutting tools and other applications [1,2,3]
To improve the red hardness, wear resistance, cutting performance and expand the application field of M2 high-speed steel, we studied the effect of cladding
Due to the addition of Cr element in coating, the Cr3 C2 ceramic phase is generated during cladding, and the of Cr3 Cof in the molten poolafter would lead to the enrichment
Summary
High-speed steels have excellent hardness and wear resistance even at elevated temperatures, and are widely used in cutting tools and other applications [1,2,3]. Ma et al [19] fabricated WC-reinforced and Co–Fe–Cr-based composite coatings on the surface of Q550 steel via laser cladding. Ni-based alloy powders are cheap and exhibit good wettability, wear resistance and corrosion resistance at high temperatures These powders have been widely used in surface repair, including cladding technology [20,21,22]. To improve the red hardness, wear resistance, cutting performance and expand the application field of M2 high-speed steel, we studied the effect of cladding. A layer of NiCrCu alloy powder was precoated on the surface of M2 high-speed steel. The results of the study may serve as an important reference for the expansion and development of new types of coatings applied on M2 high-speed steel
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