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Strain Rate Effects on Mechanical Stability of Retained Austenite in TRIP Sheet Steels
Technical Paper
2006-01-1434
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Dynamic mechanical properties of TRIP steels with the same volume fraction but different stabilities of retained austenite were evaluated over a wide range of strain rates using a high-velocity hydraulic tensile testing machine. Tensile tests were performed at strain rates ranging from 10-2 to 6×102s-1 and ultimate tensile strength, strain hardening behavior, and absorbed energy were evaluated. Strain control during high speed tensile testing was accomplished using a “stopper” attachment designed to limit strain within the gage section to an amount preset before testing. Strain was controlled successfully up to the highest strain rate examined, 200 s-1. The methodology allowed, for the first time, the extent of austenite transformation to be monitored at incremental strains during a high-rate test. At all strain rates, the extent of martensite transformation was considerable after only a few strain percent, and was essentially complete well before the onset of necking.
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Authors
Topic
Citation
Choi, I., Son, D., Kim, S., Matlock, D. et al., "Strain Rate Effects on Mechanical Stability of Retained Austenite in TRIP Sheet Steels," SAE Technical Paper 2006-01-1434, 2006, https://doi.org/10.4271/2006-01-1434.Also In
Innovations in Steel Sheet Products & Processing & Steel Bar Products
Number: SP-2035; Published: 2006-04-03
Number: SP-2035; Published: 2006-04-03
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