The effect of processing parameters on the microstructure and mechanical properties of low-Si transformation-induced plasticity steels

Al-Harbi, Fayez; Gazder, Azdiar A.; Kostryzhev, Andrii; Cooman, Bruno C. De; Pereloma, Elena V.

doi:10.1007/s10853-013-8008-z

Cited by 16 publications

(8 citation statements)

References 39 publications

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“…In stage 2 (s II ), retained austenite grains continuously transform to martensite due to the accumulation of strain. This transformation attenuates the strain hardening rate decreasing by inhibiting the dislocation glide process in regions where newly martensite grains were formed [65,68]. The higher strain hardening rate at the initial stages of deformation for CA and TC samples might be also influenced by a fast rate of austenite transformation upon straining.…”

Section: Discussionmentioning

confidence: 99%

“…During stage 1 (s I ), initial yielding and dislocation accumulation in bainitic regions lead to high strain hardening rates for samples CA and TC. At this stage, the accumulation of mobile dislocations at regions near to retained austenite grains takes place [65]. It is expected that the retained austenite grains that compose M/γ islands are among the first to transform due to the constraining effect on strain distribution and locally higher stress levels that arise in the regions surrounding the initial martensitic zones [66].…”

Section: Discussionmentioning

confidence: 99%

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The Effect of Different Annealing Strategies on the Microstructure Development and Mechanical Response of Austempered Steels

Durán

Corallo

Ros-Yanez

et al. 2021

Metals

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This study focuses on the effect of non-conventional annealing strategies on the microstructure and related mechanical properties of austempered steels. Multistep thermo-cycling (TC) and ultrafast heating (UFH) annealing were carried out and compared with the outcome obtained from a conventionally annealed (CA) 0.3C-2Mn-1.5Si steel. After the annealing path, steel samples were fast cooled and isothermally treated at 400 °C employing the same parameters. It was found that TC and UFH strategies produce an equivalent level of microstructural refinement. Nevertheless, the obtained microstructure via TC has not led to an improvement in the mechanical properties in comparison with the CA steel. On the other hand, the steel grade produced via a combination of ultrafast heating annealing and austempering exhibits enhanced ductility without decreasing the strength level with respect to TC and CA, giving the best strength–ductility balance among the studied steels. The outstanding mechanical response exhibited by the UFH steel is related to the formation of heterogeneous distribution of ferrite, bainite and retained austenite in proportions 0.09–0.78–0.14. The microstructural formation after UFH is discussed in terms of chemical heterogeneities in the parent austenite.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Effect of Different Annealing Strategies on the Microstructure Development and Mechanical Response of Austempered Steels

Durán

Corallo

Ros-Yanez

et al. 2021

Metals

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“…68 In TRIP-aided steels, the differences in the shape of work-hardening exponent curves over the period of uniform elongation allude to variations in the rate of austenite-to-martensite transformation due to the TRIP effect; in general, more gradual increases and sustained n values are correlated with a slower transformation of the retained austenite. 69 This dispersed transformation behavior is also reported to exploit the dynamic strain partitioning effects among constitute phases. 67,70 On the other hand, the damage resistance is key in controlling the total elongation of the material.…”

Section: Mechanical Behavior and Ductilitymentioning

confidence: 90%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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The present work is concerned with the study of the relationship between microstructure and ductility of nanostructured bainite. The tensile behavior of two steels treated at the same temperature during different times has been analyzed. Special attention has been paid to the role that the retained austenite mechanical stability plays in enhancing the ductility through its contribution to the work-hardening and the damage resistance of these materials. The results have shown that the relative mechanical properties of the phases present affect both the martensitic transformation behavior and the total elongation.

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“…Then, the typical transformation-induced plasticity (TRIP) steels consisting of ferrite, bainite, retained austenite and a small amount of martensite have received more attention as AHSSs, because of the high strength and ductility as well as the good formability. 14 However, the typical tensile strength of TRIP steels is still lower than that of the DP steels. [15][16][17][18] Considering the above reason, a novel kind of steel, i.e., the quenching and partitioning (Q&P) steel with a martensite and retained austenite microstructure, has been developed to meet the high strength-ductility demands.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on a 0.2C steel treated by Q&P and A&T treatments

Zhao

Huang

2016

Materials Science and Technology

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The effect of various versions of quenching and partitioning (Q&P) and austempering plus tempering (A&T) processes on the combined properties and microstructure of a 0.2C–0.8Si–2.2Mn bainitic steel has been investigated. Results show that the steel exhibits a higher value of product of strength and elongation (PSE) than that reported before with similar compositions. The one-step Q&P process at 230°C and A&T process at 450°C can result in a toughness higher than 80 J cm−2 and a relatively high PSE (above 29.8 GPa%). The alloy design of this steel is suggested to be beneficial for industrial production because there is a big window for similar PSE. The long-partitioning time (1 h) has good effect on combined properties.

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The effect of processing parameters on the microstructure and mechanical properties of low-Si transformation-induced plasticity steels

Abstract: The effect of processing parameters on the microstructure and mechanical properties of low-Si transformation-induced plasticity steels

Cited by 16 publications

References 39 publications

The Effect of Different Annealing Strategies on the Microstructure Development and Mechanical Response of Austempered Steels

The Effect of Different Annealing Strategies on the Microstructure Development and Mechanical Response of Austempered Steels

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Comparative study on a 0.2C steel treated by Q&P and A&T treatments

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