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Effect of ART‐Annealing Conditions on Microstructural Regulation and Deformation Behavior of 0.17C–9Mn–3.5Al TRIP‐Aided Steel
Author(s) -
Zhang Lei,
Huang Xingmin,
Guo Yuanbo,
Wang Yanhua,
Gao Jiewei,
Dai Guangze
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600410
Subject(s) - austenite , materials science , microstructure , volume fraction , plasticity , trip steel , annealing (glass) , work hardening , metallurgy , martensite , elongation , ultimate tensile strength , ferrite (magnet) , strain hardening exponent , hardening (computing) , diffusionless transformation , composite material , layer (electronics)
The effects of annealing conditions on the microstructure and deformation mechanism of 0.17C–9Mn–3.5Al steel have been investigated. Through austenite reverted transformation (ART) annealing, a multiphase microstructure composed of δ ‐ferrite, α ‐intercritical ferrite, γ ‐austenite, and α' ‐martensite is obtained in as‐forged specimens. For the specimen annealed at 750 °C for 60 min, a high volume fraction (42.19%) of retained austenite is attained, yielding a large total elongation (TE) of ≈38% and tensile strength ( Rm ) of ≈810 MPa and a two‐stages work hardening behavior. The work hardening behavior analysis using the differential C–J model clarifies that the multistage can be mainly attributed to the discontinuous transformation induced plasticity (TRIP) effect, which is related to the volume fraction of retained austenite and its different stability levels as well as cooperative deformation of the multiphase microstructure. Thus, the active TRIP effect predominately affects the high strain stage, resulting in a higher work hardening ability and a increased plasticity.