Computational and Experimental Investigation of Micro-Hardness and Wear Resistance of Ni-Based Alloy and TiC Composite Coating Obtained by Laser Cladding.

Guofu Lian,Hao Zhang,Yang Zhang,Changrong Chen,Xu Huang,Mingpu Yao

doi:10.3390/ma12050793

Guofu Lian, Hao Zhang + Show 4 more

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https://doi.org/10.3390/ma12050793

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Abstract

The influence of processing parameters on the micro-hardness and wear resistance of a Ni-based alloy and titanium carbide (TiC) composite cladding layer was studied. Mathematical models were developed to predict the micro-hardness and wear resistance of the cladding layer by controlling the laser cladding processing parameters. Key processing parameters were the laser power, scanning speed, gas flow, and TiC powder ratio. The models were validated by analysis of variance and parameter optimization. Results show that the micro-hardness is positively correlated with laser power and TiC powder ratio, where the TiC powder ratio shows the most significant impact. The wear volume decreased with an increasing TiC powder ratio. The targets for the processing parameter optimization were set to 62 HRC for micro-hardness and a minimal volume wear. The difference between the model prediction value and experimental validation result for micro-hardness and wear volume were 1.87% and 6.33%, respectively. These models provide guidance to optimize the processing parameters to achieve a desired micro-hardness and maximize wear resistance in a composite cladding layer.

Highlights

Laser cladding is a surface modification technology that is used to enhance the mechanical properties of a substrate
0.0001 and the lack of fit is larger than 0.05. These results indicate that there is only a 0.0001 probability of causing interference
The adequate precision value of 29.479 is larger than 4, which indicates that model accuracy is satisfied

Summary

Introduction

Laser cladding is a surface modification technology that is used to enhance the mechanical properties of a substrate. In this process, a thin layer of metal powder is placed on the surface of the substrate and both the powder and substrate are melted with a laser beam to form a cladding layer [1,2]. NiCrSiB series alloys are extensively utilized in industry due to their exceptional corrosion, wear and fatigue resistance, and cost efficiency [6,7,8]. Within this series, most of the research has focused on Ni60A powder.

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