Interactions of negative strain rate sensitivity, martensite transformation, and dynamic strain aging in 3rd generation advanced high-strength steels

Callahan, Michael; Perlade, Astrid; Schmitt, Jean-Hubert

doi:10.1016/j.msea.2019.03.042

Cited by 31 publications

(20 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of strain rate in medium-and high-Mn steels is usually discussed in terms of negative strain rate sensitivity (NSRS), which reduces the amount of work hardening at high strain rates [47,[51][52][53]. Usually, conventional TRIP steels do not show this effect [48].…”

Section: Effect Of Strain Rate On the Plc Effectmentioning

confidence: 99%

“…Generally, adiabatic heating affects both the DSA and NSRS by increased diffusion intensity [8,9,15,49]. Callahan et al [52] reported that the NSRS in 0.2C-5Mn-2.5Al TRIP steel is due to the effect of adiabatic heating, which increases the stability of retained austenite, and thus reduces the work hardening rate. They found that the NSRS in medium-Mn TRIP steel does not follow from the DSA.…”

Section: Effect Of Strain Rate On the Plc Effectmentioning

confidence: 99%

See 1 more Smart Citation

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

et al. 2019

View full text Add to dashboard Cite

The paper reviews the recent works concerning the Portevin-Le Chatelier (PLC) effect in Advanced High-Strength Steels (AHSSs) with a special attention to high-strength medium-manganese steels. Theories explaining the mechanism of the plastic instability phenomenon in steels with medium-and high-Mn contents were discussed. The relationships between microstructural effects such as TRIP (Transformation-Induced Plasticity), TWIP (Twinning-Induced Plasticity) and the PLC effect were characterized. The effects of processing conditions including a deformation state (hot-rolled and cold-rolled) and strain parameters (deformation temperature, strain rate) were addressed. Factors affecting the value of critical strain for the activation of serrated flow behavior in particular in medium-manganese steels were described.The explanation of the Portevin-Le Chatelier mechanism in medium-Mn steels showing the TRIP effect is a complicated issue because of their microstructure consisting of several phases, as well as the TRIP effect exhibited by these steels. The exact characteristics of the factors affecting the PLC effect in AHSS is very important, both from a research point of view and their industrial implementation. This overview concerns the PLC phenomenon in Advanced High Strength Steels (AHSSs), with particular emphasis on advanced medium-Mn TRIP steels. The Nature of PLC Effect in SteelsThe plastic instability phenomenon occurring during the deformation of metallic materials shows two most common forms of propagative bands: Lüders and Portevin-Le Chatelier bands. The Lüders bands refer to the regions of localized strain. They form immediately after the onset of plastic deformation from the yield point drop, followed to a dominant stage of the stress plateau stage. Lüders bands are commonly caused by static strain aging (SSA) [13]. Static strain aging is characterized by an increase in strength properties associated with a decrease in plasticity. The PLC bands are represented by characteristic serrations on stress-strain curves. PLC bands are usually related to the dynamic strain aging (DSA) effect. The occurrence of the PLC bands is much more erratic, and can be observed in various forms (serration types) in comparison to the Lüders bands.There are several theories which explain the PLC effect in metallic materials. However, none has been so far clearly confirmed. The first interpretation of this phenomenon was proposed by Cottrell [1]. From his point of view, the PLC effect is related to the interactions between solute atoms, such as C or N, and mobile dislocations. The presence of serrations on a tensile curve is associated with the rapid release of dislocations from the atmospheres of dissolved atoms, which block their movement. This model is based on the assumption that atmospheres are formed around dislocations due to volume diffusion. In the presence of substitution atoms, diffusion is facilitated by vacancies resulting from plastic deformation. The interstitial gaps located in the vicinity of the dislocation are enl...

show abstract

Section: Effect Of Strain Rate On the Plc Effectmentioning

confidence: 99%

Section: Effect Of Strain Rate On the Plc Effectmentioning

confidence: 99%

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

et al. 2019

View full text Add to dashboard Cite

show abstract

“…It was noted in the literature that medium-Mn steels are prone to a plastic instability phenomenon related to Lüders or Portevin-Le Chatelier (PLC) band formation [6][7][8]. Both types of instabilities may lead to the occurrence of numerous cracks during forming processes or delayed cracking after deep drawing [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, the explanation is still required concerning medium-Mn steels. Some of the preliminary results on this aspect can be found in works [6][7][8][10][11][12].Forming operations, like stamping, bending, etc., lead to an increase in temperature of processed elements due to the heat that was generated during technological operations performed at various strain rates. The temperature that occurs under operating conditions is in the range~60-200 • C [16,17].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

et al. 2019

View full text Add to dashboard Cite

The study addressed the microstructure and mechanical properties of hot-rolled advanced high-strength medium manganese steel. Some of the curves that were obtained in static tensile tests at deformation temperatures of 20–200 °C showed the occurrence of the heterogeneous plastic deformation phenomenon, called the Portevin-Le Chatelier (PLC) effect. The deformation temperature significantly influenced a serration character. The correlations between the deformation temperature, serration range, microstructural features, and fracture behavior were investigated. The curves showed no Lüders elongation as a result of the thermomechanical processing applied. The serrated flow phenomenon was observed at 60 and 140 °C. The serration type was different and the most enhanced at 140 °C, where the PLC effect was present in both uniform and post-uniform elongation ranges. The disappearance of serrations at 200 °C was related to the increased diffusion intensity.

show abstract

Crashworthiness by Steels

CORNETTE,

DIETSCH,

TIHAY

et al. 2023

New Advanced High Strength Steels

View full text Add to dashboard Cite

Interactions of negative strain rate sensitivity, martensite transformation, and dynamic strain aging in 3rd generation advanced high-strength steels

Cited by 31 publications

References 41 publications

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

Explanation of the PLC Effect in Advanced High-Strength Medium-Mn Steels. A Review

Analysis of Plastic Deformation Instabilities at Elevated Temperatures in Hot-Rolled Medium-Mn Steel

Crashworthiness by Steels

Contact Info

Product

Resources

About