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Abstract

A new low Ni, Co free maraging steel containing 12Ni–3·2Cr–5·1Mo–ITi (wt-%) has been developed. The optimum heat treatment was found to be solution treatment at 1098 K for 60 min followed by air cooling then aging at 753 K for 180 min. Detailed optical and transmission electron microscopy revealed that the solution treated steel transformed to lath martensite. The optimised steel achieved an ultimate tensile strength of 1700 MN m⁻² and a yield strength of 1660 MN m⁻². The toughness measured in terms of impact energy was found to be 38 J. Fractographic analysis carried out in the scanning electron microscope showed predominantly dimpled structures indicating ductile failure. The transformation temperatures for this new steel were established using dilatometry.

MST/1398

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Development of new low nickel,cobalt free maraging steel

Abstract

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