Correlation between Luder strain and retained austenite in TRIP-assisted cold rolled steel sheets

Emadoddin, Esmaeil; Akbarzadeh, Abdolhamid; Daneshi, G.H.

doi:10.1016/j.msea.2006.10.046

Cited by 41 publications

(17 citation statements)

References 9 publications

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“…These are undesirable features in applications where surface quality is vital, since the bands become visible on the finished component. There has been a report of a significant Lü ders strain in such multiphase steels [6], but only in circumstances where the heat treatment is manipulated to eliminate or greatly reduce the retained austenite content [7].…”

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confidence: 99%

Austenite stability and heterogeneous deformation in fine-grained transformation-induced plasticity-assisted steel

Ryu

Kim

et al. 2013

Scripta Materialia

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confidence: 99%

Austenite stability and heterogeneous deformation in fine-grained transformation-induced plasticity-assisted steel

Ryu

Kim

et al. 2013

Scripta Materialia

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“…The solute interstitials such as C and N atoms are responsible for the formation of Lüders band by forming Cottrell atmosphere and locking dislocations [22][23][24][25]. The studied steels are multi-phased and composed of ferrite, austenite and even cementite in the warm rolled state.…”

Section: Discussionmentioning

confidence: 99%

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

Luo

2017

Metals

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Abstract:We investigated both the microstructures and tensile properties of 7Mn steel, which was either hot-rolled, warm-rolled or cold-rolled before intercritical annealing at 700 • C for 5 h. It can be concluded that the warm-rolled and annealed microstructures are a kind of mixture of hot rolled and cold rolled ones. They are composed of ferrite and retained austenite, the latter having a wide size distribution and two types of morphologies: equiaxed and lamellar. These retained austenite grains are expected to transform to martensite in a more sustainable way-the warm-rolled and annealed steel exhibits the best combination of ultimate tensile strength and total elongation among the three studied steels and a shorter yield point elongation than the cold-rolled one.

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“…In general, the formation of Lüders bands depends primarily on the segregation of impurity solute atoms (C and/or N in Fe), which lock the dislocation movement . Specifically, for Al‐containing TRIP steels, the appearance and extent of yield‐point discontinuity are related to the IA stage and the RA characteristics …”

Section: Mechanical Behavior and Ra Transformationmentioning

confidence: 99%

Effect of retained austenite stability on cyclic deformation behavior of low‐alloy transformation‐induced plasticity steels

Christodoulou

Kermanidis

Haidemenopoulos

et al. 2019

Fatigue Fract Eng Mat Struct

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The retained austenite (RA) characteristics of Al‐containing TRIP700 steels have been manipulated using varying bainitic isothermal transformation (BIT) processing. The microstructural evolution was investigated using optical microscopy and quantitative image analysis, while the amount of transformed RA was evaluated with the saturation magnetization (SM) technique. Cyclic behavior is found to depend on the applied strain amplitude and stability of RA. At strain amplitudes with comparable elastic and plastic strain components, cyclic softening prevails, facilitated by more stable RA microstructures and Low Cycle Fatigue (LCF) performance benefits from a lower RA stability, which controls the amount of cyclic softening rate. With increasing plastic strain component, a transition to cyclic hardening is observed, and the transition strain increases with increasing RA stability. LCF performance deteriorates because of excessive cyclic strain hardening promoting martensitic transformation. The effect is accompanied by a transition from mixed dimple/cleavage to cleavage‐type fracture characteristics.

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Correlation between Luder strain and retained austenite in TRIP-assisted cold rolled steel sheets

Cited by 41 publications

References 9 publications

Austenite stability and heterogeneous deformation in fine-grained transformation-induced plasticity-assisted steel

Austenite stability and heterogeneous deformation in fine-grained transformation-induced plasticity-assisted steel

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

Effect of retained austenite stability on cyclic deformation behavior of low‐alloy transformation‐induced plasticity steels

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