合金工具網の熱処理組織と摩耗挙動

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In the earlier paper, the relationship between the austenitizing times and the mechanical propecties ofalloy tool steels was reported. In this paper. a similar relationship for the alloy tool steel SKD11 which isaustenitized at 950°C 〜1050°C for 1800sec and tempered at 180°C, 500°C has been studied by the same meth ods as in the conventional heat Lheatment. The results obtained are as follows.1. The preferable mechanical properties of the steel SKD ll for cold working are generally obtained in thehardness range of Micro Vikers HV 650 to 700. These properties can be obtained by the next heat treatment.A : Austenitized for 1800sec at higher temperature near l050°C and tempered two times at 180°C. B : Austenitized for 1800sec at lower temperature between 950°C and 1000°C and tempered two times at 180°C. C :Austenitized for 1800sec at temperature 950°C. l000°C and l050°C and tempered two times at 500°C.2. Specimens by the treatment of the temper at lower temperature near 150°C after quenching from 1050°C are almost completely austenitized and those by the treatment of the temper at lower temperature near180°C after quenching from 1000°C and 950°C include some residual ferrite in austenite. Those by the treat ment of the temper at higher temperature near 500°C after quenching from 950 °C. 1000°C and l050°C havepartial grain growth.3. A specimen by the treatment of the temper at lower temperature near 150°C after quenching from 1050°C has the most preferable mechanical properties for cold work tools. There was confirmed by the originalwear test.Key Words : Heat Treatment. Alloy Tool Steel. Abrasive Wear. Carbides.Electron Probe Maicro Analaizer
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合金工具網の熱処理組織と摩耗挙動

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