Combinatorial optimization of carbide-free bainitic nanostructures

Huang, Hanzheng; Sherif, Mohamed Y.; Rivera-Dı́az-del-Castillo, P.E.J.

doi:10.1016/j.actamat.2012.11.040

Cited by 59 publications

(23 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additions of cobalt, aluminum and nickel are helpful in this regard, which shift the T 0 curve (the locus of points where austenite and ferrite of the same composition have identical free energies) to higher carbon concentrations. [4,5,8,13,14] On the other hand, manganese and, to a lesser extent, chromium shift the T 0 curve to lower carbon concentrations and, therefore, reduce the volume fraction of bainite. [4,10] Nevertheless, they are commonly used in CFB steels for ensuring sufficient hardenability.…”

Section: Introductionmentioning

confidence: 97%

Carbide-Free Bainitic Weld Metal: A New Concept in Welding of Armor Steels

Murthy

Ram

Murty

et al. 2014

Metall Mater Trans B

View full text Add to dashboard Cite

Carbide-free bainite, a fine mixture of bainitic ferrite and austenite, is a relatively recent development in steel microstructures. Apart from being very strong and tough, the microstructure is hydrogen-tolerant. These characteristics make it well-suited for weld metals. In the current work, an armor-grade quenched and tempered steel was welded such that the fusion zone developed a carbide-free bainitic microstructure. These welds showed very high joint efficiency and ballistic performance compared to those produced, as per the current industrial practice, using austenitic stainless steel fillers. Importantly, these welds showed no vulnerability to cold cracking, as verified using oblique Y-groove tests. The concept of carbide-free bainitic weld metal thus promises many useful new developments in welding of high-strength steels.

show abstract

Section: Introductionmentioning

confidence: 97%

Carbide-Free Bainitic Weld Metal: A New Concept in Welding of Armor Steels

Murthy

Ram

Murty

et al. 2014

Metall Mater Trans B

View full text Add to dashboard Cite

show abstract

“…About 1.5-2 wt.% silicon is generally added to these steels to retard carbide precipitation during austempering [17,18]. However, it has been demonstrated that silicon retards bainite formation [19,20]. Silicon also forms an oxide scale that impairs the response of steel to hot rolling [21].…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 98%

Effects of isothermal transformation conditions on the microstructure and hardness values of a high-carbon Al–Si alloyed steel

Baradari

Boutorabi

2015

Materials & Design

View full text Add to dashboard Cite

“…In recent years, carbide-free bainitic steels have attracted considerable interest because of their unusual combination of roughly 2.5 GPa strength, 700 HV hardness, and 130 MPa·m 1/2 toughness [ 1 , 2 , 3 ]. The excellent mechanical properties depend on an ultra-fine alternative microstructure consisting of bainitic ferrite (BF) and carbon-enriched retained austenite (CERA).…”

Section: Introductionmentioning

confidence: 99%

“…However, as we know, the bainitic reaction in the medium-to-high carbon carbide-free bainitic steels is a rather time-consuming process. It may take several days or months to achieve the complete transformation, though the super bainitic microstructure can be obtained easily at low isothermal temperatures [ 3 ]. The slow reaction rate for bainitic transformation has undoubtedly become a critical factor that restricts the development of carbide-free bainitic steels in commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation and Processing Window Optimization of a 70MnSiCrMo Carbide-Free Bainitic Steel

et al. 2017

View full text Add to dashboard Cite

The hot deformation behavior of a high carbon carbide-free bainitic steel was studied through isothermal compression tests that were performed on a Gleeble-1500D thermal mechanical simulator at temperatures of 1223–1423 K and strain rates of 0.01–5 s−1. The flow behavior, constitutive equations, dynamic recrystallization (DRX) characteristics, and processing map were respectively analyzed in detail. It is found that the flow stress increases with increasing the strain rate and decreases with increasing the temperature, and the single-peak DRX can be easily observed at high temperatures and/or low strain rates. The internal relationship between the flow stress and processing parameters was built by the constitutive equations embracing a parameter of Z/A, where the activation energy for hot deformation is 351.539 kJ/mol and the stress exponent is 4.233. In addition, the DRX evolution and the critical conditions for starting DRX were discussed. Then the model of the DRX volume fraction was developed with satisfied predictability. Finally, the processing maps at different strains were constructed according to the dynamic material model. The safety domains and flow instability regions were identified. The best processing parameters of this steel are within the temperature range of 1323–1423 K and strain rate range of 0.06–1 s−1.

show abstract

Combinatorial optimization of carbide-free bainitic nanostructures

Cited by 59 publications

References 18 publications

Carbide-Free Bainitic Weld Metal: A New Concept in Welding of Armor Steels

Carbide-Free Bainitic Weld Metal: A New Concept in Welding of Armor Steels

Effects of isothermal transformation conditions on the microstructure and hardness values of a high-carbon Al–Si alloyed steel

Hot Deformation and Processing Window Optimization of a 70MnSiCrMo Carbide-Free Bainitic Steel

Contact Info

Product

Resources

About