Investigation of crack evolution in laser-cladded single-track and multi-track coatings based on thermomechanical coupling simulation

Abstract

Laser cladding (LC) is a promising surface-modification method that can be used to manufacture coating layers with unique physical and chemical properties on substrates. In this study, the single-track and multitrack overlapping cladding experiments were conducted using Ni60 powder on an H13 substrate. The morphology of cracks in single-track and multitrack clads was analyzed, and their related dynamic evolution mechanisms were discussed in depth. Furthermore, a finite element model that could be used to predict the initiation and propagation behavior of cracks was developed to explore the stress field during the cladding process. Different types of cracks were observed under different laser powers, and the experimental and simulation results simultaneously demonstrated the dynamic evolution mechanisms of the net-shaped and transverse cracks. Longitudinal cracks mainly lie in the overlapping zone of multitrack clads, and the key factor for their evolution behavior is the stress concentration caused by pore defects. This study provides a valuable understanding of the crack morphology, thermal cycles, and stress evolution in multitrack claddings of Ni60 materials from both theoretical and experimental perspectives.

Keywords

Crack initiation and propagation / Residual stress / Temperature field / Temperature gradient / Thermal stress

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Funding

National Key R&D Program of China(2023YFB4603701)

Strategic Priority Research Program of Chinese Academy of Sciences(XDB0910203)

National Natural Science Foundation of China(12472123)

RIGHTS & PERMISSIONS

Shanghai University and Periodicals Agency of Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature