Effect of Strain Rate on the Yield Stress of Ferritic Stainless Steels |
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Authors: | Kester D Clarke Jr" target="_blank">Robert J ComstockJr Martin C Mataya Chester J van Tyne David K Matlock |
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Affiliation: | (1) Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO 80401, USA;(2) Research and Technical Services Division, AK Steel Corporation, Middletown, OH 45043, USA |
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Abstract: | The effect of strain rate on the yield stress of ferritic stainless steel sheet was experimentally determined and a previously
developed model was applied to the data. Five ferritic stainless steel alloys, including one in two thicknesses, were mechanically
tested at room temperature in uniaxial tension at strain rates ranging from 0.001 to 300 s−1, and low-strain-rate tests were selectively performed at nonambient temperatures. The hypothesis that ferritic stainless
steels react similarly to strain rate as mild steels was investigated by the application of a widely accepted strengthening
model, based on body-centered-cubic (bcc) crystal lattice deformation mechanisms, to the experimental data.1] Yield stresses were compared to model predictions and good agreement was found. The results allow for the prediction of
yield stresses for these materials over strain rate ranges of 0.001 to 300 s−1, and as a function of test temperature. Model parameters for the ferritic stainless steels were reasonable relative to those
previously reported for pure bcc ferritic iron.1] A correlation between the effect of alloying additions on solid solution strengthening and the athermal component of shear
stress is also suggested. The results allow prediction of yield stress of ferritic stainless steels over a wide range of strain
rates and temperatures.
This article is based on a presentation made in the symposium entitled “Dynamic Behavior of Materials,” which occurred during
the TMS Annual Meeting and Exhibition, February 25–March 1, 2007 in Orlando, Florida, under the auspices of The Minerals,
Metals and Materials Society, TMS Structural Materials Division, and TMS/ASM Mechanical Behavior of Materials Committee.
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