COLD TOOL MATERIAL AND MANUFACTURING METHOD OF COLD TOOL
To provide a cold tool material high in hardness and excellent toughness by hardening sintering, and a manufacturing method of a cold tool using the same.SOLUTION: There is provided a cold tool material having area percentage of carbide A with equivalent circle diameter in a structure of a cross sec...
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Zusammenfassung: | To provide a cold tool material high in hardness and excellent toughness by hardening sintering, and a manufacturing method of a cold tool using the same.SOLUTION: There is provided a cold tool material having area percentage of carbide A with equivalent circle diameter in a structure of a cross section of over 5.0 μm of 1.0 to 3.0 area%, number density of carbide B with equivalent circle diameter of over 0.1 μm and 2.0 μm or less in an area of length 90 μm and width 90 μm containing no carbide A of the structure of the cross section of 6.0×10/mmor more and less than 9.0×10/mm, and number density of carbide C with equivalent circle diameter of over 0.1 μm and 0.4 μm or less of 5.0×10/mmto 7.5×10/mm. There is provided a manufacturing method of a cold tool by conducting hardening at hardening temperature of 1000 to 1050°C and sintering at sintering temperature of 150 to 600°C on the cold tool material and adjusting hardness to 58 HRC or more.SELECTED DRAWING: Figure 2
【課題】焼入れ焼戻しによって、硬さが高く、優れた靱性が得られる冷間工具材料と、それを用いた冷間工具の製造方法を提供する。【解決手段】断面の組織に占める円相当径が5.0μmを超える炭化物Aの面積率が、1.0〜3.0面積%であり、断面の組織の炭化物Aを含まない縦90μm横90μmの領域において、円相当径が0.1μmを超えて2.0μm以下の炭化物Bの個数密度が6.0×105個/mm2以上9.0×105個/mm2未満であり、円相当径が0.1μmを超えて0.4μm以下の炭化物Cの個数密度が5.0×105個/mm2以上7.5×105個/mm2未満の冷間工具材料である。そして、上記の冷間工具材料に、焼入れ温度が1000〜1050℃の焼入れと、焼戻し温度が150〜600℃の焼戻しを行って、硬さを58HRC以上に調整する冷間工具の製造方法である。【選択図】図2 |
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