Abstract
Laser cladding is one of the main technologies for material surface strengthening technologies. Residual tensile stress on the surface of the cladding layer reducing the fatigue and wear performances, is difficult to control. The phase transition dilation during the cooling process with the laser cladding technique is proposed to counteract the volume shrink and then reduce the residual tensile stress and partially replace the post cladding treatment. The influence of low temperature phase change alloy on the residual stress of the cladding layer was investigated by comparing with that of the 17-4PH stainless steel powder cladding layer. The micro hardness and friction and wear properties of the cladding layer with different particle size were also analyzed. The result shows that the volume expansion caused by phase change counter-acts the heat shrinkage produced during the cooling of the cladding layer, and the hardness and abrasion resistance of the cladding layer are improved.
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