The effect of dynamic strain aging on room temperature mechanical properties of high martensite dual phase (HMDP) steel

AISI 4340 steel bars were heated at 900°C for one hour, annealed at 738°C for different durations and oil-quenched in order to obtain dual phase steels with different ferrite volume fractions. A 3% prestrain at the temperature range of 150–450°C was then imposed to the samples, and room temperature...

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Bibliographic Details
Published in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 550; pp. 325 - 332
Main Authors:	Shahriary, M.S., Koohbor, B., Ahadi, K., Ekrami, A., Khakian-Qomi, M., Izadyar, T.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 30-07-2012 Elsevier
Subjects:	AISI 4340 Applied sciences Dual phase steels Dynamic stain aging Dynamic strain aging Elasticity. Plasticity Exact sciences and technology Ferrite High strength steels High temperature pre-strain Materials science Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Nickel chromium molybdenum steels Structural steels Tensile tests Ultimate tensile strength Volume fraction Dynamic stain aging AISI 4340 High temperature pre-strain Dual phase steels Oil quenching Annealing Ultimate strength method Ductility Metallography Tension test Tensile strength Strain ageing Prestrained material Dual phase steel Fractography
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Summary:	AISI 4340 steel bars were heated at 900°C for one hour, annealed at 738°C for different durations and oil-quenched in order to obtain dual phase steels with different ferrite volume fractions. A 3% prestrain at the temperature range of 150–450°C was then imposed to the samples, and room temperature tensile tests were carried out, afterwards. Results indicate that the maximum values for both yield and ultimate tensile strength would exist for the samples pre-strained at the temperature range of 250–300°C. Also, a sudden drop of the ductility was observed at the mentioned temperature range. The observed behavior might be attributed to the occurrence of dynamic strain aging taken place at this temperature range. It was also shown that the ferrite volume fraction has not had any remarkable influence on the strength behavior of the samples, yet its increase was shown to have affected the work hardening behavior of the samples. Fractography analyses were also performed, showing the featureless fracture surface of the samples prestrain at the range of 250–300°C, confirming the occurrence of dynamic strain aging at this condition.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2012.04.082