回転鍛造におけるインコネル718の温度変化と変形過程の解析

概要

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The radial forging machine SX 55 produced by GFM was installed in Sibukawa Plant, Daido Steel Co., Ltd. in 1986. The main purpose of this machine is to process the heat resistant materials in a fewer heats.A numerical model can be used to simulate different conditions under which the process is to operate. A decision can then made on the most suitable set of conditions.A thermal-mechanical coupled finite element method was applied using a elastoplastic material model to calculate the temperature transition of Inconel 718 deformed with 4 hammers from ingot to billet during several passes.The calculated results indicate that heat-rise caused by the penetration of stresses leads to the critical temperature for cracking due to low ductility in the case of high feeding speed and they are in good accordance with the results of forging trials.A suitable operating schedule obtained by calculations shows the possibilities of controlling the micro-structure of billet during radial forging process.
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