Abstract
Laser cladding of Co50 alloy coating and Co50 composite coatings doped with 10, 20, and 30 wt.% TiC particles was performed on the H13 steel surface. The effects of TiC concentration on the phase composition, microstructure, and microhardness of the coatings were studied. The results indicated that, in 10% TiC coating, the “bright band” is a quite flat-growth tissue, while with 20% TiC, the “white bright band” contains a large amount of black TiC particles. The composite coating Co50, 10% TiC, and 20% TiC samples can clearly distinguish the cladding zone, bonding zone, and heat-affected zone, and a good metallurgical bond is formed between the coating and the substrate. The 30% TiC coating and the substrate are not well bonded, which is attributed to the high TiC content in the coating; however, it has the best surface morphology, and there is no porosity on the surface. 10% TiC coatings have poor surface quality, show a spraying material phenomenon on two side edges which is quite serious, and a lot of porosity on the surface of the coating. In addition, 10% TiC coating includes the original TiC particles and primary TiC particles that are precipitated in situ from the liquid phase during solidification; 20% TiC coating indicates a large amount of TiC in the form of cross petals and twigs, and the figure points out that TiC exists like a large number of diffusely distributed spherical structures in the 30% TiC coating. The coatings of TiC/Co composite with less than 20% TiC showed good metallurgical bonding characteristics with the H13 steel surface.
Highlights
H13 hot work molds are constantly subjected to physical and chemical wear and tear, thermal fatigue, erosion, stress corrosion, surface thermal welding, and other physical and chemical effects, as well as the effects of cold and hot alternating and impact loads during mechanical production and use
Research shows that a good metallurgical bond is achieved between the coating and the substrate, and the microhardness of the multilayer lap coating is Ni60A ⟶ Co50 ⟶ Co42 ⟶ H13 from high to low
A similar result was reported by Xiao-Wei [19, 20]; the results showed that the addition of Al2O3 has the effect of changing the microstructure and performance of the laser cladding (LC) layer. e microstructure is refined, and wear resistant has been significantly improved
Summary
H13 hot work molds are constantly subjected to physical and chemical wear and tear, thermal fatigue, erosion, stress corrosion, surface thermal welding, and other physical and chemical effects, as well as the effects of cold and hot alternating and impact loads during mechanical production and use. E. Advances in Materials Science and Engineering traditional method of welding repair is used to repair the mold at the root of the groove, so that the mold can continue to be used without being scrapped. Advances in Materials Science and Engineering traditional method of welding repair is used to repair the mold at the root of the groove, so that the mold can continue to be used without being scrapped In response to this problem, existing studies have shown that laser repair of the H13 steel surface is a very effective method, and many researchers have achieved some results in their laser surface modification [3, 4]. It has begun to develop high-power CO2 lasers, and the most widely used lasers are 1–5 kW
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