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acicular ferrite steels

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(PDF) Acicular Ferrite Formation and Its Influencing

The formation of acicular ferrite is mainly affected by steel composition, cooling rate, inclusion landscape and austenite grain size. In recent decades, extensive research has been conducted to Acicular ferrite nucleation as a diffusion controlled Acicular ferrite is a desirable microstructure in high strength low alloy steel weld metal. This is due to its improved toughness and the enhanced mechanical properties of the weld metal. Although the nucleation of acicular ferrite has been studied by many researchers, the exact mechanisms of its nucleation and growth are still under discussion

Acicular ferrite nucleation as a diffusion controlled

Acicular ferrite is a desirable microstructure in high strength low alloy steel weld metal. This is due to its improved toughness and the enhanced mechanical properties of the weld metal. Although the nucleation of acicular ferrite has been studied by many researchers, the exact mechanisms of its nucleation and growth are still under discussion Analysis of different acicular ferrite microstructures in Mar 26, 2003 · Acicular ferrite formation, promoted by the intragranular nucleation of ferrite plates, is well known to be beneficial for achieving a good combination of mechanical properties. However, the set of microstructures that can be obtained during the subsequent development of the transformation from the primary plates generated at particles can be quite complex and depends on a certain number of Development of Acicular f errite/Bainitic microstructures Acicular ferrite (AF)/ bainite (B) is often reported as the most desirable microstructure for development of high strength pipeline grade micro alloyed steels. Therefore the research objective is aimed at obtaining desired microstructural combinations( AF/ B) and its quantification by optimizing thermo mechanical processing (TMP) schedule

Electron backscattering diffraction study of acicular

Jul 19, 2013 · This study deals with acicular ferrite, bainite, and martensite microstructures observed in three low alloy steels. Electron backscattering diffraction (EBSD) was used to assess crystallographic features of these microstructures. Evolution of acicular ferritic microstructure in a Decreasing the FRT from 850 °C, for water quenched steels deformed 33 %, resulted in the refinement of polygonal ferrite, whereas the reverse is the case with the aspect ratio of acicular ferrite. The volume fraction of acicular ferrite progressively increases as the FRT is lowered. Formation of acicular ferrite at oxide particles in steelsExperimental steels similar in composition to structural grades were prepared from weld metal deposits to study the formation of acicular ferrite under conditions experienced in the heat affected

Hot Deformation and Acicular Ferrite Microstructure in

Whereas acicular ferrite covers overall mi-crostructures in the steels deformed at 1323 and 1423K, upper bainite grown from prior austenite grain boundaries is dominant at the expense of acicular ferrite in the steels deformed at 1123 and 1223K. The polygonal shape of the austenite grains in all the steels conrms the complete re- Investigation into the mechanism of acicular ferrite Calhoun:The NPS Institutional Archive Theses and Dissertations Thesis Collection 1999-06 Investigation into the mechanism of acicular ferrite nucleation in steel weld metal Investigation into the mechanism of acicular ferrite Corpus ID:27135506. Investigation into the mechanism of acicular ferrite nucleation in steel weld metal @inproceedings{Mahony1999InvestigationIT, title={Investigation into the mechanism of acicular ferrite nucleation in steel weld metal}, author={Michael Mahony}, year={1999} }

J. Mater. Sci. Technol.

Multi-phase microstructures containing acicular ferrite or acicular ferrite dominated phase have been proved to possess good comprehensive properties in HSLA steels. This paper mainly focuses on the formation mechanisms and control methods of acicular ferrite in HSLA steels. Metallography of Steels

    Acicular ferrite: a:Martensite:' When the austenite in such steels is cooled, ferrite first forms in the Mn-depleted regions. Ferrite has a very low solubility for carbon which partitions into the Mn-enriched regions which on further cooling, transform into bands of pearlite. The banded microstructure is Morphological Development for Acicular Ferrite in High Acicular ferrite is regarded as the most desirable microstructural feature, in view of strength and toughness, in high strength pipeline steel weld metals. Recent evolution and diversity of mechanical property for base metal demand the same property as the weld.

    PHYSICAL METALLURGY OF ACICULAR FERRITE

    The work concerns the analysis of physical metallurgy acicular ferrite characteristics. Acicular ferrite is nucleated intragranularly on the non-metallic inclusions unlike the intergranularly initiated upper bainite. Acicular ferrite microstructure is characterised by predominant occurrence of high-angle interface. Research on Acicular Ferrite Nucleation Induced by Research on the Acicular Ferrite Nucleation Induced by the In-situ Reaction Inclusions in Welding Heat Affected Zone . For the formation of acicular ferrite in the pipeline steel welding heat affected zone in high heat input welding conditions, the non-metallic inclusions need higher thermal stability. Ti oxides are mainly studied at present. Study of Pipeline Steels with Acicular Ferrite Acicular ferrite X70 pipeline steel and dual-phase X70 pipeline steel can be produced by two different TMCP process through the controlling of rolling parameters and cooling conditions. At the same time, dual-phase X70 steel can also been fabricated by intercritical annealing with acicular ferrite X70 pipeline steel.

    Acicular Ferrite - an overview ScienceDirect Topics

    The detailed structure of the particular type of acicular ferrite morphology found in the higher strength HSLA TMCP steels suggests that the mis-orientation between sub-units is smaller than found for acicular ferrite in weld metals, indicative of a different origin (Wang et al., 2008).

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