Next Article in Journal
Effect of Annealing Temperature on the Corrosion Protection of Hot Swaged Ti-54M Alloy in 2 M HCl Pickling Solutions
Next Article in Special Issue
Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review
Previous Article in Journal / Special Issue
The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron
Article Menu
Issue 1 (January) cover image

Export Article

Open AccessArticle
Metals 2017, 7(1), 27;

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

1,2,* , 1,2,3
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China
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]   |  


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

Figure 1

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).

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top