Characteristics of cobalt-based alloy coating on tool steel prepared by powder feeding laser cladding

Application Prospects and Microstructural Features in Laser-Induced Rapidly Solidified High-Entropy Alloys

“…This indicated great advantages of HEA coatings over conventional alloy coatings, both in hardness and materials cost. In comparison with coatings of the similar hardness, like WC particulate-reinforced Ni-and Co-based alloys, [16][17][18] which are in fact ceramic/metal composite coatings, HEA coatings have superior advantages in toughness, high-temperature mechanical properties, and oxidation resistance. Zhang et al 50 pointed out further that the high hardness of the FeCoNiCrCuTiMoAlSiB 0.5 alloy could be contributed to the combined effects of the laser-induced rapid solidification, interstitial solid-solution strengthening by small boron atom, and the formation of martensite phase in the alloy.…”

“…13,14 In general, the laser-cladding technique can be used in the surface modification and reparation of the engineering materials requiring high hardness, high heat resistance, and high corrosion properties, such as the surface of steam turbine blades, hot rollers, and hot gears. 15,16 So far, coating materials for the laser cladding are mainly focused on Co-or Ni-based superalloys, which are considerably expensive with a relatively low hardness. 17,18 Some researchers investigated the strengthening effect in Co-and Ni-based alloy coatings by the addition of hard particles, such as WC and SiC.…”

Friction stir processing of a D2 tool steel layer fabricated by laser cladding

“…Laser cladding equipment with a laser head, a powder feeder, and a positioning device is able to laminate metallic layers on a substrate by spraying powder and melting it with a laser beam. Fabrication of tool steel layers by laser cladding is very attractive to manufacturing high value components, such as dies and cutting tools [1][2][3][4]. However, clad layers have as-cast microstructure because of melting metallic powder with a laser beam during the process, which results in lower mechanical properties than conventional rolled metallic materials.…”

Characteristics of the laser clad metal made with pow der mixture of Ni-based alloy and tungsten carbide

“…They can replace cobalt hard alloys in some special cases, for instance to make valves in nuclear engineering whenever cobalt has to be avoided. In recent years, these alloys have been the subject of increased research activity and several intensive investigations aimed at understanding their various metallurgical and mechanical characteristics [7,8,9,10]. However, the laser cladding obtained with continuous wave laser irradiation is by nature the generator of macroscopic heterogeneities, therefore crakes, porosity and partial melting of WC particles in the matrix.…”