The hardenability of austenite with different alloy content and dispersion in dual-phase steels

Demir, Bilge; Erdoğan, Mehmet

doi:10.1016/j.jmatprotec.2007.12.094

Cited by 37 publications

(28 citation statements)

References 22 publications

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“…Yi et al 31) concluded that "transformed" (new) ferrite forms by means of a nucleation and growth mechanism. However, most authors 27,28,[32][33][34][35][36][37][38] affirm that ferrite formed from intercritically annealed austenite grows epitaxially on the "retained" or "old" ferrite during cooling at medium rates. Compared to full austenitization, the IA can accelerate the formation of new ferrite due to the presence of pre-existing austenite/ferrite phase boundaries.…”

Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

“…Austenite stability is favored by carbon enrichment (chemical stabilization) as well as austenite particle size refinement 10,42,[46][47][48][49] and NF formation can contribute in both aspects. 45) Several authors 14,21,27,29,34,38,41,42,47,50) have shown that formation of NF during cooling from IAT to IHT (generally considered as epitaxial growth under paraequilibrium conditions) enhances carbon enrichment and subsequent retention of austenite. On the other hand, the austenite particles decrease in size during cooling 31) and very stable small retained austenite can be isolated by the local growth of ferrite at the expense of austenite.…”

Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

“…29,46) Processing schedules have been presented where a slow cooling rate (fast enough to avoid pearlite formation) is applied at high temperatures (generally above Ar1) in order to promote additional carbon enrichment thanks to the new ferrite formation. 2,4,11,13,37,38,51) Later, at IHT below the T 0 temperature, the remaining austenite particles can decrease in size and become further enriched with C (ϳ1.5 wt%).…”

Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

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The Role of New Ferrite on Retained Austenite Stabilization in Al-TRIP Steels

2010

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Microstructure and mechanical properties of two high Al, low-Si TRIP steels with different Cr and Mo contents were studied using continuous galvanizing line (CGL) laboratory simulation. Combined use of specific etching methods, optical and electron microscopy observations and EBSD characterization led to verify the epitaxial growth of ferrite during cooling at a moderate rate from the intercritical annealing to the isothermal holding temperature. The amounts of "new" ferrite formed during cooling and retained austenite obtained after processing are much higher in the steel with lower content of hardenability-promoting elements. Measured tensile properties and mechanical behavior of the steel strongly depend on the amount of new ferrite and retained austenite. It is found that the formation of new epitaxial ferrite from intercritical austenite can effectively contribute to the chemical and particle size stabilization of untransformed austenite as well as to obtain the desired TRIP effect under processing conditions highly compatible with industrial practice, i.e. cooling rates near 15°C/s and isothermal holding times at 460°C shorter than 60 s.

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Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

Section: The Role Of New Ferrite On Retained Austenite Stabilization mentioning

confidence: 99%

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The Role of New Ferrite on Retained Austenite Stabilization in Al-TRIP Steels

2010

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“…A few researchers have studied the effect of chemical composition, especially the micro-alloying elements and the volume fraction of composite phases (retained austenite, ferrite, martensite, bainite, etc.) on the mechanical properties of DP steel grades [5][6][7]. On the other hand, the thermo-mechanical processing conditions, involving hot rolling, cold rolling and es-*Corresponding author: tel.…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing process on microstructure and mechanical properties of C-Mn dual phase steel

SEBEK¹,

HORŇAK²,

LONGAUER³

et al. 2021

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“…This kind of combination makes them possess continuous yielding, low yield strength, high tensile strength, high initial work-hardening rates, superior uniform and total elongation compared to other high-strength low alloy (HSLA) steels at a given strength level [7][8][9][10] . At present, the usual methods to produce dual-phase steels are either intercritical annealing 3,4,7,8 or thermomechanical control process (TMCP) 5,11,12 .…”

Section: Introductionmentioning

confidence: 99%

Effect of initial microstructures on the properties of Ferrite-Martensite Dual-Phase pipeline steels with Strain-Based design

Zuo

et al. 2012

Mat. Res.

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This study aims to investigate the effect of initial microstructures on the properties of ferritemartensite dual-phase pipeline steels with strain-based design. For this purpose, the as-received acicular ferrite steels were first austenitized at 920 °C for 15 minutes followed by air cooling and water quenching to produce ferrite-pearlite and ferrite-martensite microstructure, respectively. Subsequently, the steels with ferrite-pearlite, ferrite-martensite and as-received acicular ferrite microstructure were intercritically annealed at 820 °C for 10 minutes followed by water quenching to produce three different ferrite-martensite dual-phase microstructures. Tensile tests, Vickers hardness and Charpy impact tests were carried out to investigate the mechanical properties. Scanning electron microscope was used to analyze the microstructures and tensile fractographs. The results showed that all the tensile specimens of these three different ferrite-martensite dual-phase steels fractured in ductile mode, however, their microstructures and mechanical properties varied significantly. By contrast, the ferrite-martensite dual-phase steel derived from acicular ferrite initial microstructure had optimal combination of the strength, toughness and deformability, which provided a good candidate for the pipeline steels with strain-based design used in severe geological environments.

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The hardenability of austenite with different alloy content and dispersion in dual-phase steels

Cited by 37 publications

References 22 publications

The Role of New Ferrite on Retained Austenite Stabilization in Al-TRIP Steels

The Role of New Ferrite on Retained Austenite Stabilization in Al-TRIP Steels

Influence of annealing process on microstructure and mechanical properties of C-Mn dual phase steel

Effect of initial microstructures on the properties of Ferrite-Martensite Dual-Phase pipeline steels with Strain-Based design

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