合金工具鋼 (SKD11) の焼入加熱時間と機械的性質の関係

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In the earlier paper, the relationship between the austenitizing time and the mechanical properties of high-speed tool steels was reported. In this paper, a similar relationship for the alloy tool steel SKD11 which is austenitized at 960°∿1080℃ for 10∿3000sec and tempered at 150°∿550℃ has been studied by the same methods as in the previous paper. The results obtained are as follows ; 1. The preferable mechanical properties of the steel SKD11 for cold working are generally obtained in the hardness range of Rockwell C58 to 60 (Hv 650 to 700) and in the bend strength of over 350 kg. These properties can be obtained by the next heat-treatments. A : Austenitized for a long time at lower temperature near 1000℃ and tempered between 150° and 200℃. B : Austenitized for a short time at higher temperature between 1040° and 1080℃ and tempered between the same temperatures as A. C : Austenitized for a long time at 1040° to 1080℃ and tempered above 500℃. 2. Degrees of austenitizing in the microstructure seems to become larger in the order of B→A→C. Specimens by the treatment A are almost completely austenitized and those by B include some residual ferrite in austenite. Those by the treatment C are completely austenitized and have partial grain growth. 3. A specimen by A which has been austenitized for 3000sec at 960℃ and tempered at 150℃ has the most preferable mechanical properties for cold work tools. This has been confirmed by industrial tests.
社団法人日本鉄鋼協会の論文
1974-01-01

合金工具鋼 (SKD11) の焼入加熱時間と機械的性質の関係

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