TY - JOUR

T1 - The effect of twinning and slip on the bauschinger effect of hadfield steel single crystals

AU - Karaman, Ibrahim

AU - Sehitoglu., Huseyin

AU - Chumlyakov, Y. I.

AU - Maier, Hans J.

AU - Kireeva, I. V.

N1 - Funding Information: This work was supported by the National Science Foundation Contract No. CMS 99-00090, Mechanics of Materials Program (Arlington, VA). Professor Chumlyakov’s work received support from The Russian Ministry of Education (1998–2000, MATI, Moscow). The facilities at Microanalysis of Materials, Materials Research Laboratory, The University of Illinois, were used. This laboratory is funded by DOE-DMS Grant No. DEFG02-96ER45439.

PY - 2001

Y1 - 2001

N2 - The Bauschinger effect (BE) in single crystals of Hadfield manganese steel (Fe, 12.3Mn, 1.0C in wt pct) was studied for three crystallographic orientations, [1̄11], [1̄23], and [001]. Both forward tension- reverse compression (FT/RC) and forward compression-reverse tension (FC/RT) loading schemes were used to investigate the role of deformation history on the BE. The evolution of stress-strain response and a dimensionless Bauschinger parameter were used to study the BE. The BE stems from long-range back stress generated by the dislocation pileups at the twin and localized slip boundaries. Twinning boundaries present a strong obstacle and lead to a strong BE. If localized slip followed twinning, permanent softening was evident, such as in the case of the [1̄11] FT/RC scheme. Localized slip and multiple slip in the forward loading provided a transient effect in the stress-strain response without a significant permanent softening. Hadfield steel single crystals have demonstrated a high BE for orientations conducive to combined twinning/slip deformation. The BE increased with increasing prestrain, then saturated and started to decrease, in contrast with precipitation-hardened alloys. A unique strain-hardening approach along with the back stress calculation was introduced into a viscoplastic self- consistent (VPSC) formulation. The strain-hardening formulation incorporates length scales associated with spacing between twin lamellae. The simulations correctly predicted the BE and the stress-strain response for both forward and reverse loading.

AB - The Bauschinger effect (BE) in single crystals of Hadfield manganese steel (Fe, 12.3Mn, 1.0C in wt pct) was studied for three crystallographic orientations, [1̄11], [1̄23], and [001]. Both forward tension- reverse compression (FT/RC) and forward compression-reverse tension (FC/RT) loading schemes were used to investigate the role of deformation history on the BE. The evolution of stress-strain response and a dimensionless Bauschinger parameter were used to study the BE. The BE stems from long-range back stress generated by the dislocation pileups at the twin and localized slip boundaries. Twinning boundaries present a strong obstacle and lead to a strong BE. If localized slip followed twinning, permanent softening was evident, such as in the case of the [1̄11] FT/RC scheme. Localized slip and multiple slip in the forward loading provided a transient effect in the stress-strain response without a significant permanent softening. Hadfield steel single crystals have demonstrated a high BE for orientations conducive to combined twinning/slip deformation. The BE increased with increasing prestrain, then saturated and started to decrease, in contrast with precipitation-hardened alloys. A unique strain-hardening approach along with the back stress calculation was introduced into a viscoplastic self- consistent (VPSC) formulation. The strain-hardening formulation incorporates length scales associated with spacing between twin lamellae. The simulations correctly predicted the BE and the stress-strain response for both forward and reverse loading.

UR - http://www.scopus.com/inward/record.url?scp=0001258098&partnerID=8YFLogxK

U2 - 10.1007/s11661-001-1005-x

DO - 10.1007/s11661-001-1005-x

M3 - Article

AN - SCOPUS:0001258098

VL - 32

SP - 695

EP - 706

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

SN - 1073-5623

IS - 13

ER -