EFFECT OF ALUMINUM ON THE SOLIDIFICATION MICROSTRUCTURE OF M2 HIGH SPEED STEEL

doi:10.3724/SP.J.1037.2013.00621

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 Feng¹, TU Yiyou¹, JIANG Jianqing¹, XU Huixia², ZHU Wanglong²

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

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.

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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)

About author: Correspondent: ZHOU Xuefeng, lecturer, Tel: (025)52090636, E-mail: xuefengzhou@seu.edu.cn

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	Xuefeng ZHOU
	Feng FANG
	Yiyou TU
	Jianqing JIANG
	Huixia XU
	Wanglong ZHU

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

Fig.1

不同Al添加量的M2高速钢的OM像

Fig.2

不同Al添加量的M2高速钢基体的TEM像及SAED谱

Fig.3

不同Al添加量的M2高速钢碳化物分布

Fig.4

不同Al添加量的M2高速钢中共晶碳化物形貌

Fig.5

不同Al添加量的M2高速钢中共晶碳化物三维形貌

表1 不同形貌碳化物的化学成分

Fig.6

不同形貌碳化物的TEM明场像

Fig.7

M₂C共晶碳化物背散射电子衍射像及Kikuchi花样

Fig.8

不同Al添加量的M2高速钢碳化物粉末的XRD谱

Fig.9

M2高速钢1100 ℃加热2 h后的SEM像

Fig.10

1100 ℃加热2 h后M2高速钢中碳化物的XRD谱

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