Microstructural evolution of a heat-treated H23 tool steel

被引：0
作者：
Meilinda Nurbanasari
Panos Tsakiropoulos
Eric J. Palmiere
机构：
[1] Institut Teknologi Nasional,Department of Mechanical Engineering
[2] The University of Sheffield,Department of Materials Science and Engineering
来源：
International Journal of Minerals, Metallurgy, and Materials | 2015年 / 22卷
关键词：
tool steel; microstructural evolution; heat treatment; carbides; stability; hardness;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The microstructure and the stability of carbides after heat treatments in an H23 tool steel were investigated. The heat treatments consisted of austenization at two different austenizing temperatures (1100°C and 1250°C), followed by water quenching and double-aging at 650°C, 750°C, and 800°C with air cooling between the first and second aging treatments. Martensite did not form in the as-quenched microstructures, which consisted of a ferrite matrix, M6C, M7C3, and MC carbides. The double-aged microstructures consisted of a ferrite matrix and MC, M6C, M7C3, and M23C6 carbides. Secondary hardening as a consequence of secondary precipitation of fine M2C carbides did not occur. There was disagreement between the experimental microstructure and the results of thermodynamic calculations. The highest double-aged hardness of the H23 tool steel was 448 HV after austenization at 1250°C and double-aging at 650°C, which suggested that this tool steel should be used at temperatures below 650°C.
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页码：272 / 284
页数：12
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