Abstract
H13 steel is often damaged by wear, erosion, and thermal fatigue. It is one of the essential methods to improve the service life of H13 steel by preparing a coating on it. Due to the advantages of high melting point, good wear, and corrosion resistance of Mo, Mo coating was fabricated on H13 steel by electro spark deposition (ESD) process in this study. The influences of the depositing parameters (deposition power, discharge frequency, and specific deposition time) on the roughness of the coating, thickness, and properties were investigated in detail. The optimized depositing parameters were obtained by comparing roughness, thickness, and crack performance of the coating. The results show that the cross-section of the coating mainly consisted of strengthening zone and transition zone. Metallurgical bonding was formed between the coating and substrate. The Mo coating mainly consisted of Fe9.7Mo0.3, Fe-Cr, FeMo, and Fe2Mo cemented carbide phases, and an amorphous phase. The Mo coating had better microhardness, wear, and corrosion resistance than substrate, which could significantly improve the service life of the H13 steel.
Highlights
The surface performance will be significantly reduced if H13 mold steel is exposed to high temperature for a long time [8,9,10]
Properties of Mo coating with different electro spark deposition (ESD) process parameters were investigated in detail
The coating is formed by fusion and superposition of numerous deposition points during ESD process
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The appropriate strengthening methods of improving wear and corrosion performance have become a hotspot on the surface modification of hot work molds [14]. Kong et al [15] prepared WC-12Co coatings to improve H13 mold steel’s wear resistance and electrochemical corrosion performance. Meng et al [17] investigated the mechanical properties and microstructures of H13 steel processed by a bionic laser surface alloying with different amount of TiC addition. Studied the effect of ESD process parameters on WC-Co coating with substrate of H13 steel. Existing researchers mostly use thermal spraying technology to prepare Mo coating. ESD technology to obtain better properties (microhardness, wear resistance, and corrosion resistance) than substrate. Properties of Mo coating with different ESD process parameters were investigated in detail
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