Yan Wanjun, Lei naiyi, Ling Min, Zhong Liqiong, Yi Yanliang
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Abstract
The heat treatment of high-speed steels (HSSs) was conducted with tempering times, and the microstructure and mechanical properties were systematically investigated. Results indicated that the heated HSSs were primarily constituted by α-Fe, MC, M2C, M6C, and M23C6 (where M = Fe, V, Cr, etc.). As tempering time increases, the volume fraction of M23C6 increases by 25.0%, and the content of retained austenite decreases from 13.21 to 3.53 vol.%. These result in the macrohardness of HSS increasing from 58.11 HRC to 63.52 HRC and then decreasing to 57.72 HRC, and the impact toughness increases from 7.22 to 8.21 J/cm2. The impact wear results showed that, with an increment of tempering time, the wear volume loss of the heat-treated HSS decreases from 168.21 to 46.69 mm3 and then increases to 121.51 mm3. Its wear mechanism is mainly micro-cutting, supplemented by micro-fatigue.
期刊介绍：
ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance.
The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication.
Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered
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