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Title: Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel

The martensite phase transformation dependence upon deformation modes and strain paths in a medium manganese (10 wt%) TRIP steel stamped into a T-shape panel was quantified through combination of 3D digital image correlation and synchrotron X-ray diffraction. The T-shape emulates a portion of a common anti-intrusion component. The stamping speed was kept intentionally slow (1 mm/s) so as to avoid excessive heat generation. The steel, which belongs to the third generation advanced high strength steel (3GAHSS) family, was chosen for two reasons: (1) it is two-phase, i.e. austenite and ferrite, with martensite resulting from deformation-induced phase transformation; (2) the 66 vol.% initial retained austenite volume fraction (RAVF) enabled a thorough examination of the martensite phase transformation at large deformation levels without exhaustion. Strain fields were coupled with measured RAVF values of small specimens extracted from specific locations on a formed T-shape panel. This enabled an exploration of the effects of linear, bilinear, and non-linear strain paths as well as deformation modes such as tension, plane strain, biaxial tension, and equibiaxial tension. Results suggest a significant martensite phase transformation dependence on deformation mode and strain path in the absence of fracture and when martensite phase transformation is unaffected by heat generatedmore » during forming. In general, the uniaxial and biaxial tension deformation modes facilitate the martensite phase transformation, while the smallest amount of martensite phase transformation occurs under plane strain. In conclusion, some discussion as to further application of the experimental methods detailed in this study to other 3GAHSS and the effects of fracture on martensite phase transformation is provided.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. AK Steel Corp., Dearborn, MI (United States)
  2. AK Steel Corp., Middletown, MI (United States)
  3. General Motors Corp., Warren, MI (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Report Number(s):
PNNL-SA-129061
Journal ID: ISSN 0921-5093; PII: S0921509317314582; TRN: US1800439
Grant/Contract Number:
AC02-06CH11357; EE0005976; AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 711; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Deformation modes; Martensite phase transformation; Non-linear strain path
OSTI Identifier:
1413493

Wu, Wei, Wang, Yu -Wei, Makrygiannis, Panagiotis, Zhu, Feng, Thomas, Grant A., Hector, Jr., Louis G., Hu, Xiaohua, Sun, Xin, and Ren, Yang. Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel. United States: N. p., Web. doi:10.1016/J.MSEA.2017.11.008.
Wu, Wei, Wang, Yu -Wei, Makrygiannis, Panagiotis, Zhu, Feng, Thomas, Grant A., Hector, Jr., Louis G., Hu, Xiaohua, Sun, Xin, & Ren, Yang. Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel. United States. doi:10.1016/J.MSEA.2017.11.008.
Wu, Wei, Wang, Yu -Wei, Makrygiannis, Panagiotis, Zhu, Feng, Thomas, Grant A., Hector, Jr., Louis G., Hu, Xiaohua, Sun, Xin, and Ren, Yang. 2017. "Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel". United States. doi:10.1016/J.MSEA.2017.11.008. https://www.osti.gov/servlets/purl/1413493.
@article{osti_1413493,
title = {Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel},
author = {Wu, Wei and Wang, Yu -Wei and Makrygiannis, Panagiotis and Zhu, Feng and Thomas, Grant A. and Hector, Jr., Louis G. and Hu, Xiaohua and Sun, Xin and Ren, Yang},
abstractNote = {The martensite phase transformation dependence upon deformation modes and strain paths in a medium manganese (10 wt%) TRIP steel stamped into a T-shape panel was quantified through combination of 3D digital image correlation and synchrotron X-ray diffraction. The T-shape emulates a portion of a common anti-intrusion component. The stamping speed was kept intentionally slow (1 mm/s) so as to avoid excessive heat generation. The steel, which belongs to the third generation advanced high strength steel (3GAHSS) family, was chosen for two reasons: (1) it is two-phase, i.e. austenite and ferrite, with martensite resulting from deformation-induced phase transformation; (2) the 66 vol.% initial retained austenite volume fraction (RAVF) enabled a thorough examination of the martensite phase transformation at large deformation levels without exhaustion. Strain fields were coupled with measured RAVF values of small specimens extracted from specific locations on a formed T-shape panel. This enabled an exploration of the effects of linear, bilinear, and non-linear strain paths as well as deformation modes such as tension, plane strain, biaxial tension, and equibiaxial tension. Results suggest a significant martensite phase transformation dependence on deformation mode and strain path in the absence of fracture and when martensite phase transformation is unaffected by heat generated during forming. In general, the uniaxial and biaxial tension deformation modes facilitate the martensite phase transformation, while the smallest amount of martensite phase transformation occurs under plane strain. In conclusion, some discussion as to further application of the experimental methods detailed in this study to other 3GAHSS and the effects of fracture on martensite phase transformation is provided.},
doi = {10.1016/J.MSEA.2017.11.008},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 711,
place = {United States},
year = {2017},
month = {11}
}