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Effect of Laser Scanning Rate on Characteristics of Biphasic Stainless Steel Coatings Publisher



Dinani BE1 ; Sadeghzade S2 ; Salehikahrizsangi P3 ; Faradonbeh ZZ1 ; Ashrafi A1 ; Salimijazi HR1 ; Niroumand B1 ; Doostmohammadi A4
Authors
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Authors Affiliations
  1. 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
  2. 2. School of Engineering, Westlake University, Hangzhou, 310024, China
  3. 3. Dental Research Center, School of Dentistry, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Mechanical Engineering, Lassonde School of Engineering, York University, Toronto, M3J 1P3, Canada

Source: Metallography, Microstructure, and Analysis Published:2024


Abstract

Laser cladding is a facile and inexpensive method for coating a layer of duplex stainless steel on steel substrates. In this study, a thick coating (200 µm) of Fe42Cr20Mo16Ni12C10 alloy powders was successfully bonded to a 316L stainless steel substrate through laser cladding. Various laser scanning speeds (4, 6, 8 mm/s) were employed to achieve the desired results. The coating consisted of ferrite and austenite with no undesired phase such as sigma (σ) or chi (χ). Notably, the sample synthesized at a laser scanning rate of 6 mm/s exhibited equal amounts of ferrite and austenite phases (approximately 50% ferrite–50% austenite) with the same weighting rate of elements in each phase. Additionally, this sample demonstrated the lowest porosity around 0.8%. As a result, the coating showed superior pitting corrosion resistance compared to others. This study holds potential for the future development of highly practical duplex stainless steel coatings with enhanced corrosion behavior. © ASM International 2024.
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