Effect of Boron on Microstructure and Properties of Casting Infiltration Layer of High Chromium Cast Iron
ZHANG Qianqian1, CHEN Chong1,2,*, ZHANG Cong3, MA Jingbo1, ZHANG Cheng2, MAO Feng2
1 College of Material Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China 2 National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang 471003, Henan, China 3 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Abstract: In the present work, the high chromium cast iron with different boron content was compounded on the surface of ZG45 steel by the self-melting casting infiltration technique. The effect of boron addition on the microstructure and properties of high-chromium cast iron casting infiltration layer was investigated. The phase diagram calculation software Thermo-Calc was used to calculate and analyze the solidification process of the casting infiltration layer with different boron content. SEM-EDS, XRD and microhardness tester were used to analyze the microstructure and hardness of the casting infiltration layer. The results show that the casting infiltration layer achieves metallurgical bonding with ZG45 steel matrix. No defeat such as microvoids and microcracks on the bonding interface was observed, and the casting infiltration layers with an average thickness of 10—12 mm were obtained. The casting infiltration layer without boron is composed of α-Fe and α-Fe+M7C3 eutectic structures. With a small amount of boron, the casting infiltration layers mainly consist of α-Fe matrix and α-Fe+M7C3+M2B eutectic structure, which is consistent with the calculation results of phase diagram. With the increase of boron content, eutectic structure is refined, the amount of M7C3 carbide decreases, and the amount of M2B boride increases. The microhardness of casting infiltration layer also increases. When the boron content is 0.72wt%, the microhardness of casting infiltration layer reaches 1 190HV. After quenching and then tempering at low temperature, eutectic borides and carbides in the casting infiltration layer aggregate and grow, and secondary phases are precipitated in the matrix of the casting infiltration layer. Rockwell hardness of the casting infiltration layer is improved. The impact wear test of heat-treated samples shows that the wear surface of cast infiltration layer mainly consists of cutting furrows, fatigue delamination, spalling pits, and a few tiny gouges. When boron content is 0.72wt%, the impact wear resistance reaches the best.
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2022, Vol. 36 
