Evolution of precipitates in the Nb–Ti–V microalloyed HSLA steels during reheating

Hong, Seongwon; Jun, Hyun Jo; Kang, Ki-Weon; Park, C.G

doi:10.1016/s1359-6462(02)00567-5

Cited by 98 publications

(47 citation statements)

References 7 publications

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“…Amounts of copper and molybdenum remain similar for the steel in all conditions studied. The solubilization behaviors of the microalloying elements in the austenite and their precipitates are extensively reported in the literature [8,19,20]. The amount of vanadium that precipitates varies due to the hot-induction bending and also due to the tempering.…”

Section: Resultsmentioning

confidence: 99%

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Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Silva

Pinto

Kuznetsov

et al. 2018

Metals

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Abstract:This study discusses the use of the Morrison model to estimate the strain-hardening exponent (n) in the presence of precipitation hardening for an API X80 steel pipe. As the grain size becomes larger, high values of n are expected according to the Morrison equation. However, the grain size alone is not sufficient to explain the changes of the strain-hardening exponent (n) after hot-induction bending. The vanadium in the ferritic solid solution has an important influence on the decrease of the precipitation hardening, and consequently on the increase of the values of n, despite the refinement of the grain size and high dislocation densities. Therefore, the effects of grain boundaries on the capability to uniformly distribute deformations within the plastic regime become negligible, which limits the application of the Morrison model to estimate the values of n.

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Section: Resultsmentioning

confidence: 99%

“…In this context, the increase of the strain-hardening rates is associated with the increase of the stresses that are required to loop the dislocations around the precipitates [20].…”

Section: Resultsmentioning

confidence: 99%

Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Silva

Pinto

Kuznetsov

et al. 2018

Metals

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show abstract

“…Whether this could be considered as a transformation of the V-rich precipitates of the V-MX type (containing ~47 wt.% V and ~32% of Nb) into a new FCC phase in which the amounts of Nb and V are practically reversed, and the evolution of Ti-rich precipitate remains to be studied. Hong et al [25] reported dendritic Nb-rich carbonitrides in high strength low alloy steel. On reheating the HSLA steel from 1050 to 1400 °C, the Nb content decreased with increasing temperature till 1250 °C.…”

Section: Thermo-calc Calculationsmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Hardness of Grade 91 Steel

Shrestha

Alsagabi

Charit

et al. 2015

Metals

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Grade 91 steel (modified 9Cr-1Mo steel) is considered a prospective material for the Next Generation Nuclear Power Plant for application in reactor pressure vessels at temperatures of up to 650 °C. In this study, heat treatment of Grade 91 steel was performed by normalizing and tempering the steel at various temperatures for different periods of time. Optical microscopy, scanning and transmission electron microscopy in conjunction with microhardness profiles and calorimetric plots were used to understand the microstructural evolution including precipitate structures and were correlated with mechanical behavior of the steel. Thermo-Calc™ calculations were used to support the experimental work. Furthermore, carbon isopleth and temperature dependencies of the volume fraction of different precipitates were constructed.

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“…As is well known, each microalloy addition behaves in a different way; Ti additions enable microstructural refinement by limiting grain coarsening during reheating, while Nb facilitates a high S v as a result of the strain-induced precipitation of niobium carbides, nitrides or carbonitrides in the austenite. Furthermore, the Nb which remains in solution provides solute drag and through the precipitation of carbides/carbonitrides can subsequently contribute to dispersion hardening either during or after phase transformation [5][6][7]. Numerous studies of the precipitation kinetics focus on the fully equilibrated isothermal heat treatment in austenite with the retardation of the recrystallisation by precipitation [8] or isothermal austenite to ferrite transformation at the intercritical region [9].…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical processing route to achieve ultrafine grains in low carbon microalloyed steels

2016

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Evolution of precipitates in the Nb–Ti–V microalloyed HSLA steels during reheating

Cited by 98 publications

References 7 publications

Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Effect of Heat Treatment on Microstructure and Hardness of Grade 91 Steel

Thermomechanical processing route to achieve ultrafine grains in low carbon microalloyed steels

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