Use of Advanced High Strength Steels in automotive applications is increasing. One of these materials is boron steel, which is commercially available in coated and uncoated sheets. Automotive manufacturers are using boron steel in body structure applications to produce light weight parts and to address safety requirements. Boron steel is available in a non heat-treated condition (also referred to as “green state”) which typically has a yield strength around 350 MPa. The yield strength for a fully temperature hardened boron steel increases to above 1000 MPa, depending on heat treatment temperature and quenching methods used. In this report, the static and fatigue properties of uncoated boron steel were evaluated. One objective was to understand whether these properties varied with respect to the material rolling direction (longitudinal, transverse and diagonal). For static strength analysis three different gages (1.0 mm, 1.5 mm and 2.0 mm) were evaluated. For fatigue evaluation, 3.0 mm thickness boron steel was evaluated. Based on the mechanical test data, ultimate tensile strength was not statistically significant in all three directions (longitudinal, transverse and diagonal) among three gages chosen. However, within the same gage, ultimate tensile strength is statistically significant in all three directions. 0.2% offset Yield strength and total elongation are uniform in all gages as well as in all three directions within each gage. However, uniform elongation (at max. load condition) was significant among the gages as well as within the same gages. A comparison of the monotonic and cyclic stress strain curves indicates boron steel is a strain-softening material.
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ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing
October 7–10, 2008
Evanston, Illinois, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4852-4
PROCEEDINGS PAPER
Material Characterization of Uncoated Boron Steel for Automotive Body Structure Applications
Ramakrishna Koganti,
Ramakrishna Koganti
Ford Motor Company, Dearborn, MI
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Sergio Angotti,
Sergio Angotti
Ford Motor Company, Dearborn, MI
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Asif Waheed,
Asif Waheed
University of Waterloo, Waterloo, ON, Canada
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T. H. Topper
T. H. Topper
University of Waterloo, Waterloo, ON, Canada
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Ramakrishna Koganti
Ford Motor Company, Dearborn, MI
Sergio Angotti
Ford Motor Company, Dearborn, MI
Ron Cooper
Ford Motor Company, Dearborn, MI
Dan Houston
Ford Motor Company, Dearborn, MI
Asif Waheed
University of Waterloo, Waterloo, ON, Canada
T. H. Topper
University of Waterloo, Waterloo, ON, Canada
Paper No:
MSEC_ICM&P2008-72193, pp. 149-154; 6 pages
Published Online:
July 24, 2009
Citation
Koganti, R, Angotti, S, Cooper, R, Houston, D, Waheed, A, & Topper, TH. "Material Characterization of Uncoated Boron Steel for Automotive Body Structure Applications." Proceedings of the ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASME 2008 International Manufacturing Science and Engineering Conference, Volume 2. Evanston, Illinois, USA. October 7–10, 2008. pp. 149-154. ASME. https://doi.org/10.1115/MSEC_ICMP2008-72193
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