Laser-cladding and robotic hammer peening of stainless steel 431 on low alloy steel 4140 for surface enhancement and corrosion protections

• DOI: 10.1080/01694243.2021.2011657
• Publication Date: 2021-12-13T10:34:28Z
• Authors: Hongfei Liu; Chee Kiang Ivan Tan; Xuecheng Dong; Tzee Luai Meng; Jing Cao; Yuefan Wei
• Keywords: Cladding (metalworking); Base metal; Surface Modification

Surface enhancement and coating are distinct methods that have long been developed for protecting metallic components from corrosion, erosion, wear in aggressive working environments. The former is to engineer the surface near-surface of base material towards desired performance improvements. In comparison, a deposit extrinsic materials with better-desired direct on material. Recent developments additive manufacturing rendered increased interest hybrid process coating. Here, we report laser-cladding (LC) robotic hammer peening (RHP) stainless steel (SS431) layers 4140 alloy substrates corrosion protection. Materials structural studies reveal LC-SS431 dominated by crack-free equiaxed dendrites. Their hardness compressive residual stress apparently improved RHP without introducing any interface degradations. Corrosion test an aqueous NaCl (3.5 wt.%) electrolyte shows proper processes can enhance resistance SS431 coatings, more than substrate.