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  • The production of crankshafts in pearlitic or bainitic S.G. cast iron for the automobile industry by controlled cooling after the hot shake-out operation

Abstract

The production of crankshafts made of S.G. cast iron by use of new heat treatments such as pearlitic or bainitic cycles has necessitated a feasibility study of the crankshaft manufacturing process. This study has permitted the application of sophisticated heat treatments to the austenitic phase produced by hot-shakeout operation. This process, made at high temperature, has also ensured energy savings by avoiding any classical operations such as heating and long holding times at high temperature. The results of this study have been transfered to the production of industrial pieces such as: pearlitic crankshafts presenting an alloying elements saving without any deterioration of the use properties when compared to the actual crankshafts made of S.G cast irons, pearlitic or bainitic crankshafts presenting high mechanical properties able to compete with crankshafts made of wrought steel without any supplementary energetics expenses. The optimisation of the metallurgy of the 5 or 6 cylinder crankshaft has also been ensured. The benefits of applying various heat treatments to crankshafts have been determined during the second phase of the study by an evaluation of the mechanical properties, measured not only on samples taken in the crankshaft but also on the whole prototype crankshaft.

Additional information

Authors: BAK C, Centre de Recherches de Pont-à-Mousson, Division Métallurgique, B.P. 28, F-54700 Pont-à-Mousson (FR);GOUVENEL D, Centre de Recherches de Pont-à-Mousson, Division Métallurgique, B.P. 28, F-54700 Pont-à-Mousson (FR);SCHISSLER J M, Institut National Polytechnique de Lorraine, Laboratoire Associé au CNRS, U.A.159, Parc de Saurupt, F-54042 Nancy Cedex (FR);CHOBAUT J P, Institut National Polytechnique de Lorraine, Laboratoire Associé au CNRS, U.A.159, Parc de Saurupt, F-54042 Nancy Cedex (FR)
Bibliographic Reference: EUR 12278 FR (1989) MF, 179 pp., ECU 8, blow-up copy ECU 22.50
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