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Effect of nitrogen on the austenite cooling transformation kinetics of a high-speed steel

โœ Scribed by Mingjia Wang; Yan Wang; Yuchun Xing; Lei Chen

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
245 KB
Volume
438-440
Category
Article
ISSN
0921-5093

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โœฆ Synopsis

The austenite cooling transformation kinetics of a semi-high-speed steel (HSS) with or without additional nitrogen was studied by means of DT1000 dilatometer. The stability and composition of the carbides have also been investigated using transmission electron microscopy and scanning electron microscopy. The results indicate that the addition of nitrogen can improve the hardening ability and bring down the M s temperature of the steel. The carbides in the semi-HSS with nitrogen addition contain more W and Mo elements and less Cr element. They exhibit higher stability. Quenching hardness of the semi-HSS with N is insensitive to the austenization temperature in the range from 1223 to 1423 K.

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