Deformation behaviour of a low carbon high Mn TWIP/TRIP steel. Issue 12 (13th August 2019)

• Record Type: Journal Article
• Authors: Tewary, N. K.; Ghosh, S. K.; Chakrabarti, D.; Chatterjee, S.
• Is Part Of: Materials science and technology. Volume 35:Issue 12(2019)
• Page Start: 1483
• Page End: 1496
• Publication Date: 2019-08-13
• Subjects: TWIP steel -- stacking fault energy -- cold deformation -- microstructure -- deformation twin -- martensite -- texture -- mechanical properties; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2019.1630087
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: TWIP and TRIP phenomena have been observed in Fe–20Mn–2.5Si–0.3Al–0.06C (wt-%) steel during cold deformation (CD). Mostly austenite, annealing twins and stacking faults are observed in hot rolled solution treated (HRACST) samples. Cold deformation results in γ→ϵ→α′ transformation due to its low stacking fault energy (18 mJ m −2 ). 50CD (50% CD) sample reveals strong Goss, Brass and weak Copper Twin texture components due to slipping and micro-twinning. Maximum ductility of 62% with lower tensile strength is perceived in HRACST sample, whereas, 30CD sample shows excellent tensile strength (1039 MPa) with a lower ductility (23%). Premature failure in 50CD samples is related to the formation of α′-martensite (≈35%) and deformation twins along with a higher strain hardening due to low Al content.