Abstract
TiC-high Mn steel-bonded carbide with a cellular structure was designed and fabricated by powder metallurgy techniques using coarse and fine TiC particles as the hard phase. This preparation process of the alloy was designed carefully and optimized. The microstructure of the alloy was observed using a scanning electron microscope. The results show that there are two types of microstructures observed in this TiC steel-bonded carbide: the coarse-grained TiC structure and fine-grained TiC structure. The transverse rupture strength and impact toughness of the alloy reach maximum values 2231 MPa and 12.87 J/cm2, respectively, when the starting weight ratio of MP-A (containing coarse TiC particles) to MP-B (containing fine TiC particles) is 60:40. Hence, this study serves as a feasible and economical example to prepare a high-strength and high-toughness TiC-high Mn steel-bonded carbide with little production cost increase.
Highlights
Steel-bonded carbide is a new engineering material prepared according to conventional powder metallurgical techniques using WC and/or TiC as the hard phase and steel as the metallic binder [1,2]
These images show that the microstructures of the samples containing MP-A and MP-B are not well distributed
Other than the fine TiC particles concentration zone, coarse TiC particles are the main components of the samples
Summary
Due to combining high hardness, good wear resistance, excellent oxidation resistant, superior chemical stability of the hard phase, and high toughness and suitable strength of the metallic binder, steel-bonded carbide is used in multiple applications. These applications include wear-resistant parts, extrusion dies and punches, high-speed milling, surface finishing operations, forming tools, and carbon and stainless steel machining [3,4,5,6,7]. The chemical composition of the high Mn steel matrix is the same as the metallic binder of TiC-high Mn steel-bonded carbide. The microstructure of binder phase in TiC steel-bonded carbide changes into austenite which exhibits a good ductility and toughness
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