SOLIDIFICATION CHARACTERISTICS OF RAPIDLY SOLIDIFIED HIGH SPEED STEEL POWERS PRODUCED BY WATER ATOMIZATION

Acta Metall Sin

2008, Vol. 44

Issue (2): 159-164 DOI:

Research Articles

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SOLIDIFICATION CHARACTERISTICS OF RAPIDLY SOLIDIFIED HIGH SPEED STEEL POWERS PRODUCED BY WATER ATOMIZATION

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哈尔滨工业大学材料科学与工程学院

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. SOLIDIFICATION CHARACTERISTICS OF RAPIDLY SOLIDIFIED HIGH SPEED STEEL POWERS PRODUCED BY WATER ATOMIZATION. Acta Metall Sin, 2008, 44(2): 159-164 .

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Abstract The solidification characteristics of rapidly solidified M3/2 high speed steel powers produced by water atomization were investigated. The cooling rate of the powers was calculated to be 10^5～10^7K/s. In the size range of the atomized powders, the microstructure was found to exhibit an equiaxed crystal morphology, with carbides existing in continuous network between the crystal grains. The matrix of the HSS powders was principally austenite; as the particle size decreased, the matrix changed from austenite to austenite/ ferrite. The types of carbides were mainly cubic MC and close-packed hexagonal, M2C.

Key words: rapid solidification water atomization high speed steel solidification

Received: 28 May 2007

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