Dual crack inhibition mechanism of nano-TiC in steel–copper heterostructures formed by laser powder bed fusion
Xiaoqiang Wang, Yan Zhou, Shifeng Wen, Yusheng Shi
Abstract
The formation of microcracks at the interface of steel-copper heterostructures is prone to premature failure, which severely limits the application of heterostructure components.Herein, a new approach was proposed by doping nano-TiC in interface forming by laser powder bed fusion (L-PBF) to prevent the hot crack nucleation and block the solid-state crack propagation in steel-copper heterostructures .Benefitting from the TiC doping, the tensile strength of laminated steel-copper structures increased from 372 to 526 MPa.The findings of this research present a new approach to inhibit cracking in the fabrication of heterostructure component manufacturing using L-PBF. IMPACT STATEMENTBy doping nano-TiC particles into the steel-copper bimetallic interface, Hot crack nucleation and solid-state crack propagation were inhibited, and the crack-free steel-copper heterostructures were successfully prepared using LPBF.