Abstract
The toughness of quenched and tempered tool steels fluctuates with the cooling rates in quenching. The effect of cooling rates in quenching on Charpy impact values of two types of high-speed steel, AISI M2 and the matrix alloy version of it, is investigated. The results obtained are as follow.(1) Charpy impact value of the matrix alloy is affected significantly by the cooling rate in quenching. As the cooling rate become lower, impact value decreases. This is caused by the carbide precipitation and bainitic transformation.(2) In case of M2 type high-speed steel, Charpy impact value is not affected very much by the cooling rate in quenching. It is assumed that impact properties of M2 type high-speed steel is dominated mainly by the primary carbides.
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