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Acta Metall Sin  2014, Vol. 50 Issue (7): 769-776    DOI: 10.3724/SP.J.1037.2013.00621
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EFFECT OF ALUMINUM ON THE SOLIDIFICATION MICROSTRUCTURE OF M2 HIGH SPEED STEEL
ZHOU Xuefeng 1), FANG Feng 1), TU Yiyou 1), JIANG Jianqing 1), XU Huixia 2), ZHU Wanglong 2)
1) Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189
2) Jiangsu Engineering Research Center of Tool and Die Steel, Tiangong Group, Danyang 212312
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Abstract  The effect of aluminum on the solidification microstructure of M2 high speed steel, particularly the morphology and microstructure of eutectic carbides, has been investigated by OM, TEM, SEM, EBSD and XRD. The results show that the as-cast microstructure consists of dislocation martensite and M2C eutectic ledeburite. Excessive amount of aluminum, 1.2%, favors the formation of ferrite and needle-like carbides. After the addition of aluminum, eutectic carbides are distributed more homogeneously. Additionally, the morphology of M2C eutectic carbides transforms from the fibrous to the plate-like, and their microstructure also changes significantly. The plate-like M2C has crystal defects, such as micro-twins and stacking faults, and different growing orientation between adjacent plates whereas the fibrous carbides have few defects and single crystal orientation. Compared to fibrous carbides, the plate-like carbides are much difficult to get spheroidized at high temperature, which is unfavorable for carbide refinement. The ferrite, formed by adding excessive amount of aluminum, cannot be eliminated by ordinary heat treatments, decreasing remarkably the hardness of high speed steel after quenching.
Key words:  M2 high speed steel      aluminum      solidification microstructure      M2C eutectic carbide      microstructure     
Received:  30 September 2013     
ZTFLH:  TG142.7  
Fund: Supported by National Natural Science Foundation of China (Nos.51301038, 51201031 and 51371050) and Fund of Transformation of Scientific and Technological Achievements from Jiangsu Province (No.BA2010139)
Corresponding Authors:  ZHOU Xuefeng, lecturer, Tel: (025)52090636, E-mail: xuefengzhou@seu.edu.cn   

Cite this article: 

ZHOU Xuefeng , FANG Feng , TU Yiyou , JIANG Jianqing , XU Huixia , ZHU Wanglong . EFFECT OF ALUMINUM ON THE SOLIDIFICATION MICROSTRUCTURE OF M2 HIGH SPEED STEEL. Acta Metall Sin, 2014, 50(7): 769-776.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00621     OR     https://www.ams.org.cn/EN/Y2014/V50/I7/769

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