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WELDABILITY AND JOINING CHARACTERISTICS OF AISI D2/AISI 304 STEELS USING SEMISOLID DIFFUSION JOINING
M. N. Mohammed1, M. Z. Omar2, K. S. Alhawari3, M. A. Abdelgnei4
1Department of Engineering & Technology,Faculty of Information Sciences and Engineering,Management & Science University,40100 Shah Alam, Selangor, Malaysia
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2Department of Mechanical and Materials Engineering,Faculty of Engineering and Built Environment,Universiti Kebangsaan Malaysia,43600 Bangi, Selangor, Malaysia
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2Department of Mechanical and Materials Engineering,Faculty of Engineering and Built Environment,Universiti Kebangsaan Malaysia,43600 Bangi, Selangor, Malaysia
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2Department of Mechanical and Materials Engineering,Faculty of Engineering and Built Environment,Universiti Kebangsaan Malaysia,43600 Bangi, Selangor, Malaysia
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Abstract
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 joining parameter (temperature) on the macro-appearance, microstructure of joints were investigated. The processing temperatures for the thixojoining were 1250°C, 1275°C and 1300°C respectively for 5 minutes.Interfacial microstructures were examined by optical microscope and scanning electron microscope (SEM) equipped with EDS (energy dispersive spectroscopy) in order to verify the interface welded area during thejoining process while X-ray phase analysis was performed to identify the phase evolution and the type of carbides. The Vickers micro-hardness testacross the interface perpendicular to the interfacewas measured to evaluate the mechanical properties.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. From the present study, it can be said that the semisolid diffusion joiningprocess can be utilized safely for dissimilar metal pairs.
15th International Conference on Semi-Solid Processing of Alloys and Composites
October22nd-24th, 2018, Shenzhen, China