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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 4    April 2017

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Precipitation and decomposition behaviors of carbides in AISI M2 high-speed steel with nitrogen and mischmetal
LIU Bao-long(刘宝龙)1, 3, Lü Zhi-qing(吕知清)1, 2, FENG Wei-wei(冯唯伟)3, REN Ting-zhi(任廷志)1, FU Wan-tang(傅万堂)2

1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;
2. State Key Laboratory of Metastable Material Science and Technology, Yanshan University,
Qinhuangdao 066004, China;
3. China First Heavy Industries, Qiqihar 161042, China

Abstract:The behaviors of the precipitation and decomposition of carbides in AISI M2 high-speed steel modified by nitrogen and mischmetal were investigated using DSC, XRD, SEM and TEM. The as-cast microstructure of the experimental steel consists of dendrites of iron matrix, networks of eutectic carbides and secondary carbides. The average distance between networks is about 34 μm. The carbides mainly include M2C, M(C,N) and M6C, and their relative contents are 58.5%, 30.3% and 11.2%, respectively. The average spacing between the M2C fibers is 1.5 μm. The decomposition of M2C occurs from 897.2 to 1221.5 °C (heating rate of 200 °C/h). Some precipitated carbide particles occur in the M2C matrix after holding for 15 min at 1100 °C. With increasing holding time, the carbide fibers neck down more and more obviously until they are broken down. The spectral peaks of M2C almost disappear after holding for 60 min. The spectral peaks of M6C gradually strengthen with the holding time, and the relative content of M6C increases to 79.8% after holding for 60 min. After holding for 180 min, the carbide fibers disappear, and the decomposition products consist of fine carbide particles (about 300 nm) and short rod-like carbides (about 3.5 μm).

 

Key words: high-speed steel; metastable carbides; decomposition; phase transformation refinement

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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