| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.26 ( June 1992 ) Artificial Intelligence and Wire Rods and Steel Bars ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Effect of Alloying Elements on Cold Forgeability of 0.53%C Steel Toshiyuki Hoshino, Keniti Amano, Nobuhisa Tabata, Shozaburo Nakano |
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Synopsis : The effects of alloying elements on both forgeability and hardenability were investigated in order to apply a 0.53 mass% C steel to cold forging use. The deformation resistance of a spheroidized 0.53 mass% C steel by applying the cold forging increased with alloying elements in the order of silicon, manganese, chromium, and molybdenum. The addition of silicon reduced the formability and increased the deformation resistance even in an amount as small as 0.1 mass%. The effects of manganese, chromium, and molybdenum on the formability were closely related to the change in morphology of spheroidized carbides. The hardening depth of the spheroidized steel by induction hardening was controlled by adjusting the amounts of manganese, molybdenum, and silicon. Chromium decreased the hardening depth of the spheroidezed steel, since chromium atoms were dissolved into cementite during spheroidizing annealing, resulting in stabilizing the cementite. In this case, the cementite was not fully dissolved in the austenite phase by rapid induction heating. The 0.53 mass% C steel can be applied to cold forging use by optimizing the chemical composition of the steel on the basis of these results. |
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