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Title: Dynamic Uniaxial Compression of HSLA-65 Steel at Elevated Temperatures

Abstract

Here, the dynamic response of a high-strength, low alloy Grade 65 (HSLA-65) steel, used by the United States Navy for ship hull construction, is investigated under dynamic uniaxial compression at temperatures ranging from room temperature to 1000 °C using a novel elevated temperature split-Hopkinson pressure bar. These experiments are designed to probe the dynamic response of HSLA-65 steel in its single α-ferrite phase, mixed α + γ-austenite phase, and the single γ-austenite phase, as a function of temperature. The investigation is conducted at two different average strain rates—1450 and 2100/s. The experimental results indicate that at test temperatures in the range from room temperature to lower than 600 °C, i.e. prior to the development of the mixed α + γ phase, a net softening in flow strength is observed at all levels of plastic strain with increase in test temperatures. As the test temperatures are increased, the rate of this strain softening with temperature is observed to decrease, and at 600 °C the trend reverses itself resulting in an increase in flow stress at all strains tested. This increase in flow stress is understood be due to dynamic strain aging, where solute atoms play a distinctive role in hindering dislocationmore » motion. At 800 °C, a (sharp) drop in the flow stress, equivalent to one-half of its value at room temperature, is observed. As the test temperature are increased to 900 and 1000 °C, further drop in flow stress are observed at all plastic strain levels. In addition, strain hardening in flow stress is observed at all test temperatures up to 600 °C; beyond 800 °C the rate of strain hardening isobserved to decrease, with strain softening becoming dominant at temperatures of 900 °C and higher. Moreover, comparing the high strain rate stress versus strain data gathered on HSLA 65 in the current investigation with those available in the literature at quasi-static strain rates, strain-rate hardening can be inferred. The flow stress increases from 700 MPa at 8 × 10 -4/s to 950 MPa at 1450/s and then to 1000 MPa at 2100/s at a strain of 0.1. Finally, optical microscopy is used to understand evolution of microstructure in the posttest samples at the various test temperatures employed in the present study.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Case Western Reserve Univ., Cleveland, OH (United States). Department of Mechanical and Aerospace Engineering
Publication Date:
Research Org.:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1485124
Grant/Contract Number:  
NA0001989; NA0002919
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 4; Journal ID: ISSN 2199-7446
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Split Hopkinson pressure bar; Elevated temperatures; HSLA-65 steel; High strain-rates; Dynamic strain ageing; Ferrite and austenite phases

Citation Formats

Dike, Shweta, Wang, Tianxue, Zuanetti, Bryan, and Prakash, Vikas. Dynamic Uniaxial Compression of HSLA-65 Steel at Elevated Temperatures. United States: N. p., 2017. Web. doi:10.1007/s40870-017-0130-6.
Dike, Shweta, Wang, Tianxue, Zuanetti, Bryan, & Prakash, Vikas. Dynamic Uniaxial Compression of HSLA-65 Steel at Elevated Temperatures. United States. doi:10.1007/s40870-017-0130-6.
Dike, Shweta, Wang, Tianxue, Zuanetti, Bryan, and Prakash, Vikas. Mon . "Dynamic Uniaxial Compression of HSLA-65 Steel at Elevated Temperatures". United States. doi:10.1007/s40870-017-0130-6. https://www.osti.gov/servlets/purl/1485124.
@article{osti_1485124,
title = {Dynamic Uniaxial Compression of HSLA-65 Steel at Elevated Temperatures},
author = {Dike, Shweta and Wang, Tianxue and Zuanetti, Bryan and Prakash, Vikas},
abstractNote = {Here, the dynamic response of a high-strength, low alloy Grade 65 (HSLA-65) steel, used by the United States Navy for ship hull construction, is investigated under dynamic uniaxial compression at temperatures ranging from room temperature to 1000 °C using a novel elevated temperature split-Hopkinson pressure bar. These experiments are designed to probe the dynamic response of HSLA-65 steel in its single α-ferrite phase, mixed α + γ-austenite phase, and the single γ-austenite phase, as a function of temperature. The investigation is conducted at two different average strain rates—1450 and 2100/s. The experimental results indicate that at test temperatures in the range from room temperature to lower than 600 °C, i.e. prior to the development of the mixed α + γ phase, a net softening in flow strength is observed at all levels of plastic strain with increase in test temperatures. As the test temperatures are increased, the rate of this strain softening with temperature is observed to decrease, and at 600 °C the trend reverses itself resulting in an increase in flow stress at all strains tested. This increase in flow stress is understood be due to dynamic strain aging, where solute atoms play a distinctive role in hindering dislocation motion. At 800 °C, a (sharp) drop in the flow stress, equivalent to one-half of its value at room temperature, is observed. As the test temperature are increased to 900 and 1000 °C, further drop in flow stress are observed at all plastic strain levels. In addition, strain hardening in flow stress is observed at all test temperatures up to 600 °C; beyond 800 °C the rate of strain hardening isobserved to decrease, with strain softening becoming dominant at temperatures of 900 °C and higher. Moreover, comparing the high strain rate stress versus strain data gathered on HSLA 65 in the current investigation with those available in the literature at quasi-static strain rates, strain-rate hardening can be inferred. The flow stress increases from 700 MPa at 8 × 10-4/s to 950 MPa at 1450/s and then to 1000 MPa at 2100/s at a strain of 0.1. Finally, optical microscopy is used to understand evolution of microstructure in the posttest samples at the various test temperatures employed in the present study.},
doi = {10.1007/s40870-017-0130-6},
journal = {Journal of Dynamic Behavior of Materials},
number = 4,
volume = 3,
place = {United States},
year = {2017},
month = {9}
}

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