engleski

Prediction of hardness distribution within axially symmetrical workpieces thereupon high pressure gas quenching

The aim of a joint project among: the Stiftung Institut für Werkstofftechnik (IWT) the University of Bremen ; the company Ipsen International, and the Faculty of Mechanical Engineering and Naval Architecture (FMENA), the University of Zagreb is to develop a computer programme for prediction of hardness on the axial section of axially-symmetrical workpieces of any complex shape, thereupon high pressure gas quenching. The hardenability for two steel grades and the cooling dynamics under two gas pressures are measured using the unique facility at IWT. With developed computer simulation model the cooling curves at different positions (J) along the end-quenched specimen are determined. Based on them the cooling time from 800 to 500 oC (t8/5) is determined, and the curves J = f(t8/5) are derived for different quencing conditions. This curves together with curves of hardness distributions along the end-quenched specimens can serve for the prediction of hardness distribution on the cross sections of a batch of workpieces cooled in vacuum furnace.

high pressure gas quenching ; hardenability ; hardness distribution

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