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Metals 2018, 8(5), 316;

Microstructure and Mechanical Properties of Thixowelded AISI D2 Tool Steel

Department of Engineering & Technology, Faculty of Information Sciences and Engineering, Management & Science University, Selangor 40100, Malaysia
Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Selangor 43600, Malaysia
Department of Automated Manufacturing Engineering, Al-Khwarizmi college of Engineering, University of Baghdad, Baghdad 10071, Iraq
Author to whom correspondence should be addressed.
Received: 9 March 2018 / Revised: 14 April 2018 / Accepted: 19 April 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Semi-solid Processing of Alloys and Composites)
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Rigid perpetual joining of materials is one of the main demands in most of the manufacturing and assembling industries. AISI D2 cold work tool steels is commonly known as non-weldable metal that a high quality joint of this kind of material can be hardly achieved and almost impossible by conventional welding. In this study, a novel thixowelding technology was proposed for joining of AISI D2 tool steel. The effect of joining temperature, holding time and post-weld heat treatment on microstructural features and mechanical properties were also investigated. Acceptable joints without defect were achieved through the welding temperature of 1300 °C, while the welding at lower temperature resulted in a series of cracks across the entire joint that led to spontaneous fracture after joining. Tensile test results showed that maximum joint tensile strength of 271 MPa was achieved at 1300 °C and 10 min holding time, which was 35% of that of D2 base metal. Meanwhile, tensile strength of the joined parts after heat treatment showed a significant improvement over the non-heat treated condition with 560 MPa, i.e., about 70% of that of the strength value of the D2 base metal. This improvement in the tensile strength attributed to the dissolution of some amounts of eutectic chromium carbides and changes in the microstructure of the matrix. The joints are fractured at the diffusion zone, and the fracture exhibits a typical brittle characteristic. The present study successfully confirmed that by avoiding dendritic microstructure, as often resulted from the fusion welding, high joining quality components obtained in the semi-solid state. These results can be obtained without complex or additional apparatuses that are used in traditional joining process. View Full-Text
Keywords: thixowelding; thixojoining; semisolid joining; cold-work tool steel thixowelding; thixojoining; semisolid joining; cold-work tool steel

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Mohammed, M.N.; Omar, M.Z.; Al-Zubaidi, S.; Alhawari, K.S.; Abdelgnei, M.A. Microstructure and Mechanical Properties of Thixowelded AISI D2 Tool Steel. Metals 2018, 8, 316.

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