Development of new classes of low and medium carbon weldable steels characterised by an optimal combination of wear resistance and toughness
The experimental work concerned the development of new classes of low- and medium-carbon steels capable of ensuring an optimum combination of wear resistance and toughness. The criterion adopted for selection of the steels was that of obtaining dual-phase structures (of the F+MA, B+MA or M+A types) which appeared interesting from the wear-resistance aspect. Attention was thus focused on low- and medium-carbon steels (0.1-0.25%) with the addition of elements such as Cr, Mo, V, Si and B for the control of hardenability. The results of the experimentation reveal that dual-phase structures at the as-rolled stage can guarantee good levels of wear resistance. In particular, whatever the distribution of the commonest phases (ferrite or bainite), wear-resistance improves (for the same hardness) with increase in the MA phase. This holds good for the C1 control-rolled steels and for the C2 steels air-cooled after rolling. Where the latter are concerned, it has been ascertained that the best wear-resistance is obtained with completely bainitic structures associated with MA volume fractions in the order of 15%, hardness being between 320 and 350 HV30.
Bibliographic Reference: EUR 12497 IT (1990) 75 pp., FS, ECU 8.75
ISBN: ISBN 92-826-1191-4
Record Number: 199010523 / Last updated on: 1994-12-01
Original language: it
Available languages: it