Effect of Molybdenum on the Microstructures and Properties of Stainless Steel Coatings by Laser Cladding

Abstract

Stainless steel powders with different molybdenum (Mo) contents were deposited on the substrate surface of 45 steel using a 6 kW fiber laser. The microstructure, phase, microhardness, wear properties, and corrosion resistance of coatings with different Mo contents were studied by scanning electron microscopy (SEM), electron probe microanalyzer (EPMA), X-ray diffraction (XRD), microhardness tester, wear tester, and electrochemical techniques. The results show that good metallurgical bonding was achieved between the stainless steel coating and the substrate. The amount of M 7 (C, B) 3 type borocarbide decreases and that of M 2 B and M 23 (C, B) 6 type borocarbides increases with the increase of Mo content in the coatings. The amount of martensite decreases, while the amount of ferrite gradually increases with the increase of Mo content. When the Mo content is M, Mo 2 C phase appears in the coating. The microstructure of the coating containing Mo is finer than that of the Mo-free coating. The microhardness decreases and the wear resistance of the coating gradually improves with the increase of Mo content. The wear resistance of the 6.0 wt. % Mo coating is about 3.7 times that of the Mo-free coating. With the increase of Mo content, the corrosion resistance of the coating firstly increases and then decreases. When the Mo content is 2.0 wt. %, the coating has the best corrosion resistance.

Effect of Cobalt on Microstructure and Wear Resistance of Ni-Based Alloy Coating Fabricated by Laser Cladding

“…On the basis of previous experiments [33,34], the laser cladding process parameters were chosen as follows: the laser power, the scanning speed, and the feeding powder rate were 2000 W, 240 mm/min, and 15 g/min, respectively. The cladding layer fabricated was about 1.86 mm thick.…”

Mechanical Properties, Electronic Structures, and Debye Temperature of NixBy Compounds Obtained by the First Principles Calculations

“…Researchers have carried out a lot of experimental studies on the properties of Ni-B binary compounds [6][7][8][9]. Laser cladding is a new type of surface modification technology, in which some powders of special properties are cladded onto the surface of a substrate [10,11]. Compared with other traditional surface modification technologies, it can create coatings with better mechanical properties [12,13].…”

Special Issue on Solid State Lasers Materials, Technologies and Applications

“…The effect of welding position on the quality of the laser welds is investigated in detail by B. Chang, Z. Yuan, H. Pu, H. Li, H. Cheng, D. Du, and J. Shan in [14], where a high-power (6 kW) fiber laser is used to weld titanium alloys. Finally, a study on the effect of Molybdenum content on the microstructures and properties of stainless steel coatings by laser cladding is reported by K. Wang, B, Chang, J, Chen, H. Fu, Y. Lin, and Y. Lei in [15].…”