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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 646 pages |
| ISBN: | 978-0-9879917-6-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
The Effect Of Dynamic Strain Aging On Mechanical Properties And Work Hardening Behavior Of High Martensite Dual Phase (HMDP) 4340 Steels
Mohammad Saeed Shahriary1;1MAVADKARAN-MAPNA, Karaj, Iran;
Type of Paper: Regular
Id Paper: 481
Topic: 9
Abstract:
Dual-phase ferrite/martensite steels with different volume fraction of ferrite were produced by heating a 4340 steel bar for 1h at 900°C and intercritical annealing at 738°C for different durations and a final oil quenching. Samples were then 3% pre-strained at temperature range of 150-450°C. Room temperature tensile test was performed on strained and unstrained samples. It was found that both yield stress and ultimate tensile strength have a maximum value at temperature range of 250-300°C. This anomalous behavior was attributed to dynamic strain aging effects. Data obtained from tensile tests were analyzed in terms of Hollomon equation and it was seen that work hardening of this steel can be described in two separate stages. Peaks observed in diagrams of Hollomon equation parameters at intermediate values of pre-strain temperature have been found as a mark of occurrence of dynamic strain aging as well as ones observed for YS and UTS at that temperature regime.