Stress-State, Temperature, and Strain Rate Dependence of Vintage ASTM A7 SteelSource: Journal of Engineering Materials and Technology:;2019:;volume( 141 ):;issue: 002::page 21002Author:Brauer, S. A.
,
Whittington, W. R.
,
Rhee, H.
,
Allison, P. G.
,
Dickel, D. E.
,
Crane, C. K.
,
Horstemeyer, M. F.
DOI: 10.1115/1.4041388Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The structure–property relationships of a vintage ASTM A7 steel is quantified in terms of stress state, temperature, and strain rate dependence. The microstructural stereology revealed primary phases to be 15.8% ± 2.6% pearlitic and 84.2% ± 2.6 ferritic with grain sizes of 13.3 μm ± 3.1 μm and 36.5 μm ± 7.0 μm, respectively. Manganese particle volume fractions represented 0.38–1.53% of the bulk material. Mechanical testing revealed a stress state dependence that showed a maximum strength increase of 85% from torsion to tension and a strain rate dependence that showed a maximum strength increase of 38% from 10−1 to 103 s−1at 20% strain. In tension, a negative strain rate sensitivity (nSRS) was observed in the quasi-static rate regime yet was positive when traversing from the quasi-static rates to high strain rates. Also, the A7 steel exhibited a significant ductility reduction as the temperature increased from ambient to 573 K (300 °C), which is uncommon for metals. The literature argues that dynamic strain aging (DSA) can induce the negative strain rate sensitivity and ductility reduction upon a temperature increase. Finally, a tension/compression stress asymmetry arises in this A7 steel, which can play a significant role since bending is prevalent in this ubiquitous structural material. Torsional softening was also observed for this A7 steel.
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contributor author | Brauer, S. A. | |
contributor author | Whittington, W. R. | |
contributor author | Rhee, H. | |
contributor author | Allison, P. G. | |
contributor author | Dickel, D. E. | |
contributor author | Crane, C. K. | |
contributor author | Horstemeyer, M. F. | |
date accessioned | 2019-03-17T10:32:39Z | |
date available | 2019-03-17T10:32:39Z | |
date copyright | 10/18/2018 12:00:00 AM | |
date issued | 2019 | |
identifier issn | 0094-4289 | |
identifier other | mats_141_02_021002.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4256195 | |
description abstract | The structure–property relationships of a vintage ASTM A7 steel is quantified in terms of stress state, temperature, and strain rate dependence. The microstructural stereology revealed primary phases to be 15.8% ± 2.6% pearlitic and 84.2% ± 2.6 ferritic with grain sizes of 13.3 μm ± 3.1 μm and 36.5 μm ± 7.0 μm, respectively. Manganese particle volume fractions represented 0.38–1.53% of the bulk material. Mechanical testing revealed a stress state dependence that showed a maximum strength increase of 85% from torsion to tension and a strain rate dependence that showed a maximum strength increase of 38% from 10−1 to 103 s−1at 20% strain. In tension, a negative strain rate sensitivity (nSRS) was observed in the quasi-static rate regime yet was positive when traversing from the quasi-static rates to high strain rates. Also, the A7 steel exhibited a significant ductility reduction as the temperature increased from ambient to 573 K (300 °C), which is uncommon for metals. The literature argues that dynamic strain aging (DSA) can induce the negative strain rate sensitivity and ductility reduction upon a temperature increase. Finally, a tension/compression stress asymmetry arises in this A7 steel, which can play a significant role since bending is prevalent in this ubiquitous structural material. Torsional softening was also observed for this A7 steel. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Stress-State, Temperature, and Strain Rate Dependence of Vintage ASTM A7 Steel | |
type | Journal Paper | |
journal volume | 141 | |
journal issue | 2 | |
journal title | Journal of Engineering Materials and Technology | |
identifier doi | 10.1115/1.4041388 | |
journal fristpage | 21002 | |
journal lastpage | 021002-9 | |
tree | Journal of Engineering Materials and Technology:;2019:;volume( 141 ):;issue: 002 | |
contenttype | Fulltext |