Refining the Carbide Size in AISI M50 High-Speed Steel Through Tailored Compositional Modifications
Ping Yang, Xiaochang Xie, Changshu Yang, Xu Hui, Tianqi Liu
TL;DR
This study improves the properties of M50 steel by modifying its composition to refine carbides and increase hardness.
Contribution
A new steel variant with refined carbides and higher hardness was developed through tailored compositional modifications.
Findings
The redesigned steel achieved 66 HRC hardness, 7.57% higher than conventional M50 steel.
The average primary carbide size was reduced by 27.0% compared to M50 steel.
V-rich MC carbides were eliminated, and Fe- and Cr-rich M23C6 carbides were detected, enhancing hardness.
Abstract
The present study focuses on redesigning the composition of the conventional M50 steel grade, which is widely used for high-temperature bearings. Through thermodynamic calculations, a new steel variant was developed in the laboratory with the aim of refining carbides and improving hardness. After undergoing quenching at 1070 °C and triple tempering at 540 °C, the hardness reached 66 HRC, which is 7.57% higher than that of M50 steel (61 HRC). Meanwhile, the hardness at 400 °C reached 60 HRC. In addition to the typical M2C and M6C carbides found in M50 steel, the presence of Fe and Cr-rich M23C6 carbides was detected in the redesigned steel after triple tempering. These carbides play a significant role in enhancing hardness. Furthermore, the heat treatment process effectively eliminated the uneven and coarse carbides. The average size of primary carbides is 4.6 ± 0.6 μm, which represents…
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Taxonomy
TopicsMetal Alloys Wear and Properties · Microstructure and Mechanical Properties of Steels · High Temperature Alloys and Creep