実加工速度におけるステンレス鋼の変形特性におよぼす温度の影響 (塑性加工<特集>)

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For the high precision cold and warm forging, the appropriate die design and production sequence based on the distribution of stress and strain for forging materials are required. Therefore, the deformation characteristics of forging steels are very important.In this paper, the flow stress, ductility and hardness of austenitic and martensitic stainless steels under the high speed forming conditions and these temperature dependency were researched in order to develop the cold and warm forging technology.The upsetting tests were carried out by the cylindrical specimens incrementally on platens with concentric grooves in the strain rate range from 20 to 50sec-1 and temperature range from the RT to 700°C.As a result, the flow stress of the austenitic stainless steels at RT was about 1100MPa and the martensitic one was 900MPa. And the temperature dependency of the flow stress was significant. For example, the flow stress at 600°C was 500MPa. The critical reduction in height of the austenitic one was about 70 percent but the martensitic one was beyond 80 percent. The hardness of the austenitic one was 450HV and the martensitic one was 350HV at RT. And the temperature dependencies of the critical reduction in height and hardness were insignificant together.Under the high speed forming condition, the temperature rised in proportion as the strain. For example the surface temperature rise at unit strain was about 130°C. And this temperature rise could be estimated by the stress strain curve.The stress strain curve under the high speed forming condition did not show the work hardening, because of the softening derived from the temperature rise. In comparison with the static flow stress, the flow stress under the high speed forming condition was 200MPa higher at 300°C under isothermal condition.
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実加工速度におけるステンレス鋼の変形特性におよぼす温度の影響 (塑性加工<特集>)

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