Acquisition of Heterogeneous Constitutive Relationship of Ni60 Laser Cladding Layer Based on Nano-Indentation Experiment

Laser cladding technology has broad application prospects in the field of parts repair. The acquisition of heterogeneous constitutive relationship of laser cladding layer is an important aspect in the study of laser cladding mechanism. This paper studied the acquisition method of heterogeneous constitutive relationship of Ni60 laser cladding layer. Single and multi-channel lap Ni60 laser cladding layers were prepared using a synchronous powder delivery laser cladding system on a Cr12MoV substrate, which were observed by electron microscopy, and the hardness was measured by a Vickers hardness meter. According to the distribution characteristics of metallographic structure and the magnitude and stability of Vickers hardness, the cladding layer was divided into surface zone, middle zone, bonding zone and heat affected zone. The elastic modulus of different zones were obtained by the nano-indentation experiment. A finite element model was established to simulate the experimental process of nano-indentation. The mechanical property parameters of different zones of cladding layer were inversely calculated, and the heterogeneous constitutive relationship of cladding layer was established. The comparison of over simulation results and experimental results verifies the effectiveness of the established constitutive model. The results show that the heterogeneous constitutive model of cladding layer can be effectively obtained by the proposed method. The experiment is simple and only less experiment is needed.