Effect of Quenching Temperature on Microstructure and Properties of Al-Bearing High-Boron High-Speed Steel
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Microstructure and properties of the alloys could be changed by heat treatment process. In this work, effect of quenching temperature on the microstructure of Al-bearing high-boron high-speed steel (AB-HSS) was investigated by means of optical microscopy, scanning electron microscopy and X-ray diffraction. Hardness and wear resistance of AB-HSS at different quenching temperatures were tested by rockwell hardness tester, microhardness tester and wear tester, respectively. The experimental results indicate that the microstructure of as-cast AB-HSS is mainly composed of pearlite, ferrite, M2B-type boride and M23(C, B)6-type borocarbide. After quenched treatment, the matrix transforms into the martensite and the type of boride has no obvious change. The morphology of boride changes from continuous network and fish-bone to isolate shape and granular distribution. As quenching temperature increases, the hardness of alloy increases. The hardness reaches 65.1 HRC when quenching temperature is 1110 °C. The wear resistance of alloy gradually increases with the increase in quenching temperature. The wear resistance is the best when the quenching temperature reaches 1110 °C.
KeywordsAl-bearing high-boron high-speed steel Quenching temperature Microstructure evolution Hardness Wear resistance
The authors would like to thank the financial support for this work from National Natural Science Foundation of China under grant (51475005), and Beijing Natural Science Foundation (2142009), and “Hundred Talents” of Shaanxi Province (The eighth batch).
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