Mechanical Properties of Bitumen Quenched Dual Phase Steel
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Date
2017
Authors
Amuda, M.O.H.
Olaniyan, T.A.
Osoba, L.O.
Akinlabi, E.T.
Journal Title
Journal ISSN
Volume Title
Publisher
Sains Malaysiana
Abstract
The mechanical properties of Dual Phase Steel (DPS)-duplex structure-produced by quenching in pre-heated bitumen
have been investigated. Medium carbon steels intercritically heated at different temperatures and holding times were
quenched in hot bitumen. Optical and scanning electron microscopy characterisation of the duplex structure showed
extensive network of fibrous martensite in a ferritic matrix with occasional presence of polygonal martensite. The duplex
phase structure exhibited continuous yielding dynamics, improving the tensile and hardness values by about 42 and 35%,
respectively, relative to the normalised structure. But, the elongation and impact values decreased by about 42 and 50%,
respectively, when compared to the normalised structure. These values are similar to those obtained in duplex structure
produced using conventional oil quenching. The tensile fractured surface showed transition between a predominantly
cleavage mode in the lower annealing temperature to a mixed mode in the upper bound of the annealing temperature.
These findings suggest that pre-heated bitumen can be exploited for the production of DPSs.
Description
Keywords
Duplex structure; fibrous martensite; intercritical annealing; tensile fractured surface
Citation
AMUDA, M.O.H; OLANIYAN, T.A; OSOBA, L.O. and AKINLABI, E.T. (2017). Mechanical Properties of Bitumen Quenched Dual Phase Steel. Sains Malaysiana 46(5): 743–753