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Metals 2017, 7(1), 27; doi:10.3390/met7010027

Effects of Austenitizing Conditions on the Microstructure of AISI M42 High-Speed Steel

1,2
,
1,2,* , 1,2,3
,
1,2,3
and
1,2
1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China
3
Central Iron & Steel Research Institute, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 4 December 2016 / Revised: 3 January 2017 / Accepted: 12 January 2017 / Published: 18 January 2017
(This article belongs to the Special Issue Alloy Steels)
View Full-Text   |   Download PDF [5057 KB, uploaded 18 January 2017]   |  

Abstract

The influences of austenitizing conditions on the microstructure of AISI M42 high-speed steel were investigated through thermodynamic calculation, microstructural analysis, and in-situ observation by a confocal scanning laser microscope (CSLM). Results show that the network morphology of carbides could not dissolve completely and distribute equably in the case of the austenitizing temperature is 1373 K. When the austenitizing temperature reaches 1473 K, the excessive increase in temperature leads to increase in carbide dissolution, higher dissolved alloying element contents, and unwanted grain growth. Thus, 1453 K is confirmed as the best austenitizing condition on temperature for the steel. In addition, variations on the microstructure and hardness of the steel are not obvious when holding time ranges from 15 to 30 min with the austenitizing temperature of 1453 K. However, when the holding time reaches 45 min, the average size of carbides tends to increase because of Ostwald ripening. Furthermore, the value of Ms and Mf decrease with the increase of cooling rate. Hence, high cooling rate can depress the martensitic transformation and increase the content of retained austenite. As a result, the hardness of the steel is the best (65.6 HRc) when the austenitizing temperature reaches 1453 K and is held for 30 min. View Full-Text
Keywords: high-speed steel; austenitizing temperature; cooling rate; carbides; martensite high-speed steel; austenitizing temperature; cooling rate; carbides; martensite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Luo, Y.; Guo, H.; Sun, X.; Mao, M.; Guo, J. Effects of Austenitizing Conditions on the Microstructure of AISI M42 High-Speed Steel. Metals 2017, 7, 27.

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