Microstructure-mechanical property relationships in isothermally transformed vanadium steels

Todd, J. A.; Li, P.

doi:10.1007/bf02665318

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…Nb, Ti, Mo and V are well known microalloy additions that refine the grain size, retard recrystallization and provide fine carbide or carbo-nitride precipitates, all of which lead to improved mechanical properties [20][21][22][23][24][25][26][27]. However, such additions also influence the kinetics of the austenite to ferrite transformation and therefore influence interphase precipitation.…”

Section: Introductionmentioning

confidence: 99%

The effect of molybdenum on interphase precipitation and microstructures in microalloyed steels containing titanium and vanadium

et al. 2018

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Despite much research into steels strengthened through interphase precitation, there remains much that is not clear, such as the role of a range of elements, particularly Mo, in the interphase precipitation process. Four steels were manufactured with identical composition, but with variations in Ti, V, Mo and N content to investigate the effect of composition on interphase precipitation. Alloys were rapidly cooled from the single austenite phase field and isothermally transformed at 630°C and 650°C for 90min. The addition of Mo was found to significantly reduce the austenite to ferrite transformation kinetics, particularly for the V steel. Interphase precipitation was observed in all alloys at both transformation temperatures. For the Ti bearing steel, the two types of precipitate were observed throughout the sample, namely TiC (finer) and Ti2C (coarser), while for the V bearing steels, VC (finer) and V4C3 (coarser) were observed. Where Mo was present in the alloy, it was found dissolved in all carbide types. The (Ti,Mo)C and (V,Mo)C formed by classical planer interphase precipitation (PIP) while the (Ti,Mo)2C and (V,Mo)4C3, that had a much wider row spacing, formed through curved interphase precipitation (CIP). Each adopted one variant of the Baker-Nutting orientation relationship. The Ti-microalloyed steels exhibited the smallest precipitates of all the steels, which were approximately the same size irrespective of whether Mo was present in the alloy and irrespective of the transformation temperature. However, the addition of Mo to the V bearing steels resulted in a significant increase in precipitate volume fraction and a reduction in precipitate size. The mechanisms of interphase precipitation leading to the coincident production of two different precipitate types is considered and the role of Mo on the interphase precipitation process is discussed. The resultant effect on strength is considered.

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Section: Introductionmentioning

confidence: 99%

The effect of molybdenum on interphase precipitation and microstructures in microalloyed steels containing titanium and vanadium

et al. 2018

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“…Interphase precipitation of VC or V(C,N) during austenite to ferrite transformation under slow-cooling condition or upon isothermal holding at high inter-critical temperature (~700 °C) is an established phenomena in V-microalloyed steels [30][31][32][33]55]. Lower transformation temperature increases the driving force for austenite to ferrite transformation and accelerates the interphase migration.…”

Section: Precipitate Study In the Processed Samplesmentioning

confidence: 99%

Effect of composition and isothermal holding temperature on the precipitation hardening in Vanadium-microalloyed steels

Karmakar

Mukherjee

Kundu

et al. 2017

Materials Characterization

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“…Moreover, Barbacki and Honeycombe reported that [7] lowering the transformation temperature can change the VC morphology from interphase to fibrous. Todd and Li studied the relationship between the interphase precipitation reactions and the mechanical properties in an Fe-0.2C-1.0V-0.5Mn steel and found that the greatest contribution to precipitation strengthening is due to the interphase and matrix precipitation of VC particles, but the fibrous VC precipitates could not be associated with low values of the Charpy impact toughness [8].…”

Section: Introductionmentioning

confidence: 99%

“…Khalid and Edmonds observed that parallel VC precipitates form in an Fe-0.82C-11.90Mn-0.48V steel, which is almost perpendicular to the interface in pearlitic ferrite [9]. Six classifications of VC morphologies were found to form in lowcarbon steels [8], but whether they can precipitate in medium-carbon steels or not is still unclear. Meanwhile, for fibrous precipitates, Khalid et al and Smith et al considered them as interphase precipitates [9,10], but [8].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Characteristics and Mechanism of Vanadium Carbides in a V-Microalloyed Medium-Carbon Steel

Pan

Umemoto

2018

Acta Metall. Sin. (Engl. Lett.)

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The precipitation characteristics and mechanism of vanadium carbides during isothermal transformation at 650°C in a V-microalloyed medium-carbon steel were investigated through scanning electron microscopy and transmission electron microscopy as well as dilatometry test. Five morphologies of vanadium carbides were found to precipitate at different nucleation sites during the transformation. Two kinds of interphase precipitation form simultaneously in both pro-eutectoid and pearlitic ferrites. The linear arrays of fine interphase precipitates are parallel to the c/a interface, and the fine needles of interphase precipitates are perpendicular to the c/a interface. The vanadium carbides of long or short fibers, coarse particles and fine particles form in both pro-eutectoid and pearlitic ferrites, displaying different precipitation distributions and orientation relationships with ferrite. The precipitation mechanisms of vanadium carbide precipitates with different modes were proposed, and the precipitation sequence of various vanadium carbide precipitates was finally ascertained.

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Microstructure-mechanical property relationships in isothermally transformed vanadium steels

Cited by 25 publications

References 21 publications

The effect of molybdenum on interphase precipitation and microstructures in microalloyed steels containing titanium and vanadium

The effect of molybdenum on interphase precipitation and microstructures in microalloyed steels containing titanium and vanadium

Effect of composition and isothermal holding temperature on the precipitation hardening in Vanadium-microalloyed steels

Precipitation Characteristics and Mechanism of Vanadium Carbides in a V-Microalloyed Medium-Carbon Steel

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