Weldability and Joining Characteristics of AISI D2/AISI 304 Steels Using Semisolid Diffusion Joining
The application of hybrid structures or components made of dissimilar metal offers the potential to utilize the advantages of different materials often providing unique solutions to engineering requirements. However, the joining of materials by conventional welding techniques becomes difficult if the physical properties such as melting temperature and thermal expansion coefficients of the two materials are different. In this study, a new process of joining semi-solid AISI D2 tool steel and AISI 304 stainless steel using a partial remelting method is proposed. Moreover, the effect of the holding time on the microstructural evolution was investigated. The processing temperatures for the thixojoining was 1320°C and held for 5, 12, 20 and 30 minutes, respectively. The results obtained from investigating the basic geometries demonstrated a good joining quality that differs from the conventional process of welding. Metallographic analyses along the joint interface between semi-solid AISI D2 and 304 stainless steel showed a smooth transition from one to the other, with neither oxides nor microcracking being observed.
Qiang Zhu, Ahmed Rassili, Stephen P. Midson and Xiao Gang Hu
M. N. Abdul Razaq et al., "Weldability and Joining Characteristics of AISI D2/AISI 304 Steels Using Semisolid Diffusion Joining", Solid State Phenomena, Vol. 285, pp. 115-120, 2019