The effect of Nb on the strain rate and temperature dependent behaviour of quenching &amp; partitioning steels

Vercruysse, Florian; Celada-Casero, Carola; Linke, Bernd M.; Verleysen, Patricia; Petrov, Roumen H.

doi:10.1016/j.msea.2020.140293

Cited by 23 publications

(11 citation statements)

References 55 publications

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“…The addition of 0.025wt% Nb resulted in the average martensite grain diameter being reduced in size from 3.7µm to 2.7µm. On top of this, the retained austenite is characterized by a smaller grain size as well, as is reported in prior work [10]. The more refined structure results in a higher fraction of grain and phase boundaries.…”

Section: Hydrogen Charging and Characterizationsupporting

confidence: 75%

“…The higher EI is partially attributed to the higher fraction of hydrogen in the sample, as observed earlier, but also to the higher austenite fraction. The Nb addition resulted in an increase of the retained austenite fraction from 10% to 13%, but the austenite is generally of lower stability [10]. The higher fraction of low stability austenite results in the higher fraction of high carbon martensite being formed in the Nb steel when compared to the Nb free steel upon straining.…”

Section: Static and Dynamic Tensile Behaviourmentioning

confidence: 97%

“…4 and 5ppm H for the Nb free and Nb steel has clearly caused a significant reduction in the ductility of the steel when tested under static conditions (strain rate 0.003-0.03s -1 ). The addition of Nb to the Q&P steel, next to the general increase in the strength (UTS) and strain hardening rate of the steel, caused the steel to have a higher susceptibility to hydrogen embrittlement [10]. The Nb steel suffers more (EI of 57% compared to 44%) in comparison to the Nb free steel.…”

Section: Static and Dynamic Tensile Behaviourmentioning

confidence: 99%

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The effect of Nb on the high strain rate hydrogen embrittlement of Q&P steel

et al. 2021

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Quenching and Partitioning (Q&P) steels are, due to their excellent combination of strength and ductility, seen as good candidates for the third generation advanced high strength steels (AHSS). Although the TRIP effect is beneficial for the overall mechanical behaviour of these steels it potentially can have detrimental effects when strained in a hydrogenenriched environment. The solubility of hydrogen is high in austenite but low in high carbon martensite. Martensite is even in the absence of hydrogen already a possible damage initiation spot. The effect of hydrogen under static and dynamic tensile loading was evaluated in a Q&P and a Nb micro-alloyed Q&P steel. Experiments were carried out under a strain rate ranging from 0.03 s-1 till 500 s-1 and correlated with the hydrogen uptake characterised via thermal desorption spectroscopy (TDS). The presence of Nb resulted in a 25% increase in the hydrogen uptake capacity. A higher susceptibility to hydrogen was observed in the Nb steel partially due to the high hydrogen fraction, but also because of the larger fraction of low stability austenite. However, when tested under dynamic conditions the hydrogen susceptibility is minor and even improved in the micro-alloyed Q&P steel compared to the standard Q&P steel.

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Section: Hydrogen Charging and Characterizationsupporting

confidence: 75%

Section: Static and Dynamic Tensile Behaviourmentioning

confidence: 97%

Section: Static and Dynamic Tensile Behaviourmentioning

confidence: 99%

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The effect of Nb on the high strain rate hydrogen embrittlement of Q&P steel

et al. 2021

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“…It should also be noted that a lower stability of retained austenite in the base + Cr + Nb steel compared to other grades was recently demonstrated in Ref. [28]. This was related to the lower retained austenite carbon content (1.08 wt%) in the base + Cr + Nb steel than, for example, in the base grade (1.14 wt%) and to its somewhat larger average grain size.…”

Section: Influence Of Microstructure On Tensile Behavior and Formabil...mentioning

confidence: 63%

“…In order to assess the planar anisotropy, additional tensile tests were performed in the rolling, 45 • and transverse direction on miniaturized samples following the procedures and measurement techniques described in Ref. [28]. The Lankford coefficient R was obtained using the following equation [29]:…”

Section: Mechanical Testing 221 Uniaxial Tensile Testingmentioning

confidence: 99%

Effect of alloying and microstructure on formability of advanced high-strength steels processed via quenching and partitioning

Xia

Vercruysse

Celada-Casero

et al. 2022

Materials Science and Engineering: A

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Dilatometric study on phase transformations in non-deformed and plastically deformed medium-Mn multiphase steels with increased Al and Si additions

Kozłowska

2024

J Therm Anal Calorim

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In this work, two novel alloys containing 4 and 5 mass.% Mn were subjected to theoretical calculations using JMatPro software and experimental studies using dilatometry in order to determine their critical temperatures and ranges of phase transformations of supercooled austenite in undeformed and deformed states. The differences in the kinetics of phase transformations and final microstructures were observed using a light microscope and compared for both investigated alloys. The Mn addition had a strong effect on reducing the Ac3 and Ms temperatures. The plastic deformation applied prior cooling affected the Ms temperature of investigated alloys and kinetics of phase transformations. Both investigated alloys showed high hardenability in the deformed and non-deformed states; and therefore, they can be used as good candidates for products obtained via the Quenching and Partitioning process. Investigated alloys can be used both for sheets and plates of increased thickness because the homogeneous martensitic microstructure can be obtained in a wide range of cooling rates during quenching. The obtained results show a wide technological window for the investigated alloys in producing sheets and plates via the Quenching and Partitioning process.

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The effect of Nb on the strain rate and temperature dependent behaviour of quenching & partitioning steels

Cited by 23 publications

References 55 publications

The effect of Nb on the high strain rate hydrogen embrittlement of Q&P steel

The effect of Nb on the high strain rate hydrogen embrittlement of Q&P steel

Effect of alloying and microstructure on formability of advanced high-strength steels processed via quenching and partitioning

Dilatometric study on phase transformations in non-deformed and plastically deformed medium-Mn multiphase steels with increased Al and Si additions

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