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A laminated composite consisting of an ultrahigh carbon steel (UHCS) and an 8Ni-2Si iron interleaf material can be selectively heat treated without carbon diffusion between adjacent layers. This desirable attribute leads to a low ductile-brittle transition temperature (DBTT) of about 163K ( − 110°C) after selective heat treatment. This result is a consequence of notch blunting from the presence of the sharp interlayer boundary and the tough interleaf material. Based on Charpy notch impact results of selectively heat-treated UHCS composites containing 8Ni-2Si iron and other interleaf materials, it is concluded that the DBTT is principally a function of the notch-toughness of the interleaf material.

ABSmACTThermal and mechanical processing procedures were developed to prepare unique metal matrix laminated composites (MMLC) based on a combination of ultra high carbon steel (UHCS) and brass. The MMLC material, of 50 volume percent of each component, was processed at about 700°C to large strains by' a combination of rolling and press-bonding. Discrete interlayer boundaries were retained until layer thicknesses of less than 10 /Lm were reached. At this stage brass penetrated the UHCS material and became the continuous component. The UHCS/brass laminated composites can be selectively heat-treated with no interdiffusion between the layers. Exceptional ductility'was obtained in the laminated composite in bend and tensile tests a1 room tempera1ure.

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