Effect of Niobium on the Phase Transformation Behavior of Aluminum Containing Steels for TRIP Products

Fonstein, Nina; Yakubovsky, O.; Bhattacharya, Debanshu; Siciliano, Fulvio

doi:10.4028/www.scientific.net/msf.500-501.453

Cited by 6 publications

(7 citation statements)

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“…Extensive formation of new ferrite in Al-TRIP steels has previously been described by several authors. 23,28,29,53) Besides, Suh et al have shown that partial replacement of Si by Al encourages the conversion of intercritical austenite to ferrite during cooling from intercritical annealing.…”

Section: Resultsmentioning

confidence: 99%

“…It has © 2009 ISIJ been found that, compared to fully austenitization, the intercritical annealing of the steel can drastically accelerate the formation of "new ferrite" (despite the significantly higher carbon content and hardenability of austenite), due to the presence of pre-existing austenite/ferrite phase boundaries. 29,[51][52][53][54] During cooling, these interfaces only need to grow epitaxially and the step of nucleation is not required. According to Fig.…”

Section: Resultsmentioning

confidence: 99%

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Design of Composition in (Al/Si)-alloyed TRIP Steels

Gómez

García

Haezebrouck³

et al. 2009

ISIJ Int.

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Fig. 11. Comparison of the effect of the addition of (0.5-2 %) Mn, (0-1.5 %) Al, (0-1.5 %) Si to the steel presented in Table 2 on austenite volume fraction, austenite carbon content, carbon equivalent calculated with Eq. (1) and ideal diameter (DI) at 800°C; (a) effect of Mn-Al combinations with 0 % Si, (b) effect of Mn-Si combinations with 0 % Al, (c) effect of Si-Al combinations with 1.5 % Mn.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design of Composition in (Al/Si)-alloyed TRIP Steels

Gómez

García

Haezebrouck³

et al. 2009

ISIJ Int.

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“…In addition, the product of tensile strength and total elongation for steel C (Cr + Al steel) slightly decreases from 16.22 GPa% for steel B (Cr steel) to 14.39 GPa%. Fonstein et al [38] and Meyer et al [17] reported that Al addition can promote the formation of a high-temperature transformation product such as ferrite. Therefore, the amount of bainite transformation decreases because of less supercooled austenite.…”

Section: Influence Of Cr Additionmentioning

confidence: 99%

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

Tian

Zhou

et al. 2017

Metals

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Three low-carbon bainitic steels were designed to investigate the effects of Cr and Al addition on bainitic transformation, microstructures, and properties by metallographic method and dilatometry. The results show that compared with the base steel without Cr and Al addition, only Cr addition is effective for improving the strength of low-carbon bainitic steel by increasing the amount of bainite. However, compared with the base steel, combined addition of Cr and Al has no significant effect on bainitic transformation and properties. In Cr-bearing steel, Al addition accelerates initial bainitic transformation, but meanwhile reduces the final amount of bainitic transformation due to the formation of a high-temperature transformation product such as ferrite. Consequently, the composite strengthening effect of Cr and Al addition is not effective compared with individual addition of Cr in low-carbon bainitic steels. Therefore, in contrast to high-carbon steels, bainitic transformation in Cr-bearing low-carbon bainitic steels can be finished in a short time, and Al should not be added because Al addition would result in lower mechanical properties.

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“…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%

“…Compared to full austenitization, the IA can accelerate the formation of new ferrite due to the presence of pre-existing austenite/ferrite phase boundaries. 13,[39][40][41] During cooling, these interfaces only need to advance into the austenite because the new (epitaxial) ferrite has the same crystallographic orientation as the untransformed one. Hence, the step of nucleation of ferrite is not required, as new grain boundaries are not formed, resulting in a faster reaction.…”

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

confidence: 99%

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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Effect of Niobium on the Phase Transformation Behavior of Aluminum Containing Steels for TRIP Products

Cited by 6 publications

References 0 publications

Design of Composition in (Al/Si)-alloyed TRIP Steels

Design of Composition in (Al/Si)-alloyed TRIP Steels

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

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

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