The Formation of Intragranular Acicular Ferrite in Simulated Heat-affected Zone.

Lee, Jye-Long; Pan, Yaohua

doi:10.2355/isijinternational.35.1027

Cited by 107 publications

(71 citation statements)

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“…14. 46) Maximum values of the volume fraction for intragranular acicular ferrite in the microstructure were obtained for 48 and 102 ppm sulfur contents in steel with and without Ca additions, respectively. It should be pointed out that the optimum range of S content for a maximum AF proportion in metal is different for various steel grades, as shown for steels without and with Ca additions in Fig.…”

Section: Depletion Of Mn Content Near Inclusionsmentioning

confidence: 93%

“…Therefore, the relationships between the volume fraction of acicular ferrite and austenite grain size tend to follow a C-type curve. This C-type relationship was obtained experimentally by Lee and Pan 46) for Ti-killed steels without and with additions of Ca. Figure 7 shows the effect of the mean austenite grain size in metal on a relative nucleation potential for intragranular acicular ferrite, which can be estimated by Lee's approach.…”

Section: Austenite Grain Sizementioning

confidence: 96%

“…During the last 10-15 years many studies 10,12,46,[60][61][62][63][64][65] have discussed the effect of a Mn-depleted zone (MDZ) near inclusions on the acicular ferrite formation. It is well known that an increased Mn content promotes the enlargment of the austenite zone in steel.…”

Section: Depletion Of Mn Content Near Inclusionsmentioning

confidence: 99%

“…10,12,46,[60][61][62][63][64][65] It should be pointed out that it is, in many cases, difficult to decide which mechanism that is most important for formation of acicular ferrite. Instead, it is believed that these mechanisms often work together to promote the intragranular nucleation on inclusions.…”

Section: Mechanisms Of Acicular Ferrite Nucleationmentioning

confidence: 99%

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On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

2009

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The effects of non-metallic inclusions in nucleating acicular ferrite in steels during cooling from a weld or cooling from an austenitic temperature are reviewed. The influence of the acicular ferrite (AF) structure on mechanical properties of steels such as strength and toughness is briefly mentioned. The different factors affecting the formation of acicular ferrite, such as the soluble content of alloying elements in steel, cooling rate from austenitizing temperature, austenite grain size and inclusion characteristics in steel, are discussed. The mechanisms of acicular ferrite formation on non-metallic inclusions, such as reduction of interfacial energy, mismatch strain between the inclusion and ferrite/austenite, thermal strains at the inclusions and changes in matrix composition near the inclusions are also discussed. Finally, the effects of inclusion characteristics, such as size, number and composition are described and their effectiveness in nucleating acicular ferrite is discussed.KEY WORDS: non-metallic inclusions, intragranular acicular ferrite formation, strength and toughness, steel. 1063

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Section: Depletion Of Mn Content Near Inclusionsmentioning

confidence: 93%

Section: Austenite Grain Sizementioning

confidence: 96%

Section: Depletion Of Mn Content Near Inclusionsmentioning

confidence: 99%

Section: Mechanisms Of Acicular Ferrite Nucleationmentioning

confidence: 99%

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On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

2009

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“…This effect was first observed for weld metals. [8] Comprehensive reviews on the formation of acicular ferrite have been done by Bhadeshia [9] as well as Sarma et al [10] Up to now, C-Mn-(Ni) weld metals [11][12][13][14][15] were the most investigated material related to the formation of acicular ferrite.…”

Section: Introductionmentioning

confidence: 99%

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Loder

Michelic

Mayerhofer

et al. 2017

Metall Mater Trans B

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Acicular ferrite nucleates intragranularly on nonmetallic inclusions, forming a microstructure with excellent fracture toughness. The formation of acicular ferrite is strongly affected by the size, content, and composition of nonmetallic inclusions, but also by the composition of the steel matrix. The potential of inclusions in medium carbon HSLA (high-strength low-alloyed) steels has been the main focus in the literature so far. The current study evaluates the acicular ferrite capability of various inclusions types in four different steel grades with carbon contents varying between 0.04 and 0.65 wt pct. The investigated steels are produced by melting experiments on a laboratory scale and subsequent heat treatment in a High-Temperature Laser Scanning Confocal Microscope. Inclusions are exclusively formed by deoxidation and desulfurization reactions. No synthetic particles are added to the melt. The inclusion landscape is analyzed by Scanning Electron Microscopy. Final ductility of the samples is evaluated based on performed tensile tests. Inclusion types in every steel grade are assessed regarding their nucleation potential always considering the interaction with the steel composition, especially focusing on the role of manganese. The effects of (Ti,Al)O x -, MnS-, and MgO-containing inclusions are discussed in detail.

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Effect of Mn, Si and Mn‐Si Alloying on the Precipitation of Ultra‐fine Oxides in Fe during Solidification

Zheng

Zheng³

et al. 2007

steel research international

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The effect of Mn, Si and Mn‐Si alloying on the precipitation of oxide inclusions in Fe during solidification has been investigated. The results show that the inclusions precipitating during solidification are relatively small and distribute uniformly in Mn, SI and Mn‐Si alloyed steels. Most of the inclusions are nearly spherical. The maximum diameter of inclusions is only 3.3μm in the three types of alloyed steels. The average size of inclusions is 1.3μm, 1.2μm and 1.1μm in Mn, Si and Mn‐Si alloyed steels, respectively. The maximum amount of inclusions is 1.1×105 per unit volume (mm−3) in Mn alloyed steel and the minimum is 5.8×104 per unit volume in Si alloyed steel. The volume fractions of the inclusions with Mn, Si and Mn‐Si alloying are 0.01%, 0.005% and 0.006%, respectively.

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The Formation of Intragranular Acicular Ferrite in Simulated Heat-affected Zone.

Abstract: (Fig. 2(b)). Further increase in the volume fraction of IAF in steel CS2 (Fig. 2(c) Ca-addedand non-Ca steels.

Cited by 107 publications

References 0 publications

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Effect of Mn, Si and Mn‐Si Alloying on the Precipitation of Ultra‐fine Oxides in Fe during Solidification

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