Effect of the Strain Rate on the Mechanical Properties of Austenitic–Martensitic TRIP Sheet Steel with Low Martensite Content

Autor: L. I. Kobeleva, M. A. Kaplan, V. F. Terent’ev, O. V. Rybal’chenko, A. S. Baikin, V. P. Sirotinkin
Rok vydání: 2020
Předmět:
Zdroj: Russian Metallurgy (Metally). 2020:1225-1229
ISSN: 1555-6255
0036-0295
DOI: 10.1134/s0036029520100298
Popis: The effect of the static tension rate in the range from 0.1 to 50 mm/min on the mechanical properties of austenitic–martensitic VNS9-Sh TRIP sheet steel with a low content (27%) of strain-induced martensite in the surface layer (27%) is investigated. The tensile strength and the relative elongation of the steel is shown to decrease when the strain rate increases due to the suppression of the TRIP effect, whereas the yield strength remains almost the same. As the loading rate increases, the yield strength first decreases and then, starting from a rate of 3 mm/min, increases to reach a value close to the yield strength at a loading rate of 50 mm/min. The fracture at a low strain rate (0.1 mm/min) occurs by the mode I fracture mechanism, and at a high rate (50 mm/min) it occurs by mode II fracture mechanism.
Databáze: OpenAIRE
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