Retained austenite in dual-phase silicon steels and its effect on mechanical properties

Saleh, Mat Husin; Priestner, R.

doi:10.1016/s0924-0136(01)00638-0

Cited by 91 publications

(50 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…28) Then, the so-called "new" ferrite has been usually considered as something "to be avoided" and therefore many authors have used in their studies very high cooling rates (Ͼ30°C/s) or even quenching to salt baths that hinder austenite transformation during cooling. 1,2,6,[9][10][11]19,24,29,30) However, TRIP steels are usually coated and those cooling rates are much higher than the typical values close to 15°C/s found in industrial continuous galvanizing (CG) lines. 7) There is controversy in the literature about the nature and properties of new ferrite as well as its influence on the stabilization of austenite and final mechanical properties of multiphase steels.…”

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%

“…45,49) Ferrite growth during cooling from IA to IH can represent the first step for the decrease in Ms temperature (austenite stabilization) that is subsequently culminated by bainite formation during the IH. 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%

See 2 more Smart Citations

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

2010

View full text Add to dashboard Cite

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.

show abstract

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%

See 1 more Smart Citation

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

2010

View full text Add to dashboard Cite

show abstract

“…Austenite and ferrite phase fractions are both 50% at 700 °C, see Figure 1. These values are important for designing the hot rolling and intercritical annealing processes [15]. The studied steel was melted in 50 kg vacuum induction furnace and cast into ingot, which was then hot forged into 40 mm-thick plates.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Microstructures and Mechanical Properties of 7Mn Steel Manufactured by Different Rolling Processes

Luo

2017

Metals

View full text Add to dashboard Cite

Abstract:We investigated both the microstructures and tensile properties of 7Mn steel, which was either hot-rolled, warm-rolled or cold-rolled before intercritical annealing at 700 • C for 5 h. It can be concluded that the warm-rolled and annealed microstructures are a kind of mixture of hot rolled and cold rolled ones. They are composed of ferrite and retained austenite, the latter having a wide size distribution and two types of morphologies: equiaxed and lamellar. These retained austenite grains are expected to transform to martensite in a more sustainable way-the warm-rolled and annealed steel exhibits the best combination of ultimate tensile strength and total elongation among the three studied steels and a shorter yield point elongation than the cold-rolled one.

show abstract

“…6) However, steels with high contents of silicon pose difficulties in the welding process. In order to reduce the content of such elements without loss of strength and ductility, some investigations have been carried out 7,8) and also some other alternatives have been proposed. The TRIP-aided steel containing aluminum in place of silicon was also proposed and the effects of aluminum and silicon on the TRIP properties was compared.…”

Section: Introductionmentioning

confidence: 99%