Precipitation of VC in ferrite and pearlite during direct transformation of a medium carbon microalloyed steel

Dunlop, G. L.; Carlsson, Carl Johan; Frimodig, G.

doi:10.1007/bf02646709

Cited by 60 publications

(16 citation statements)

References 11 publications

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“…[1,4,5] Similarly, Tarui et al [6] have shown that increasing the silicon content from 0.2 to 1.5 pct in an eutectoid carbon steel improved both the tensile yield and ultimate strengths, primarily due to solid solution strengthening of the pearlitic ferrite by silicon addition. In these cases, the increased strengthening in microalloyed steels has been related to the main microstructural constituent, pearlite, which consists of two phases, ferrite and cementite, as alternating lamellae.…”

Section: Introductionmentioning

confidence: 96%

Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels

Elwazri

Yue

Wanjara

2005

Metall Mater Trans A

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The effect of prior-austenite grain size and transformation temperature on nodule size and colony size of hypereutectoid steels containing 1 pct carbon with different levels of vanadium and silicon was investigated. Specimens of the various steels were thermally processed at various temperatures ranging from 900 °C to 1200 °C and transferred to salt bath conditions at 550 °C, 580 °C, and 620 °C to examine the structural evolution of pearlite. The heat-treatment work showed that for only the hypereutectoid steel without vanadium there was a continuous grain boundary cementite network, the thickness of which increased with increasing reheat temperature. Analysis of the thermally processed hypereutectoid steels also indicated that the prior-austenite grain size and transformation temperature controlled the nodule size, while the colony size was dependent on the latter only.

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Section: Introductionmentioning

confidence: 96%

Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels

Elwazri

Yue

Wanjara

2005

Metall Mater Trans A

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“…It was shown that the intersheet spacing of carbide precipitation was affected by the continuous cooling rate, 1,2) the isothermal transformation temperature [3][4][5] and the chemical composition. 3,5) According to these studies, the intersheet spacing of interphase boundary precipitation depends on the diffusion of the substitutional element that constitutes alloy carbide or the driving force for nucleation of carbide.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ferrite Growth Rate on Interphase Boundary Precipitation in V Microalloyed Steels

et al. 2012

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The interphase boundary precipitation behavior of vanadium carbide during isothermal ferrite transformation, which is the important phenomena for the hot forged medium carbon steels, was investigated and modeled. It was found that the intersheet spacing of interphase boundary precipitation of VC decreased with a decrease of ferrite growth rate during isothermal transformation. As a major factor affecting such an interphase boundary precipitation behavior, it was deduced that the vanadium segregation on migrating austenite/ferrite interphse boundary is quite important to understand the repeated precipitation of VC. In numerical simulation of VC precipitation, the influence of the vanadium concentration on the precipitation behavior at austenite/ferrite interface during isothermal transformation was examined based on a time-dependent solute drag model incorporated with parabolic growth rate. It was found that the change of the intersheet spacing during ferrite growth can be simulated by the newly proposed model for interphase boundary precipitation of alloy carbide.KEY WORDS: interphase boundary precipitation; vanadium carbide; medium carbon steel.

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“…In general, microalloying is adopted for this purpose by using elements such as Nb, V or Ti [4]. It is well known that transition metals like Nb, V or Ti have the tendency to interact with interstitial elements such as C and N, forming precipitates [5,6,7]. Among Nb, V and Ti, Ti is thermodynamically the first element to precipitate during solidification.…”

Section: Introductionmentioning

confidence: 99%

Novel ultrafine Fe(C) precipitates strengthen transformation-induced-plasticity steel

Tirumalasetty

Fang

et al. 2012

Acta Materialia

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A transmission electron microscopy (TEM) study was conducted on nanoprecipitates formed in Ti microalloyed TRIP assisted steels, revealing the presence of Ti(N), Ti 2 CS, and a novel type of ultra-fine Fe(C) precipitates. The matrix/precipitate orientation relationships, sizes and shapes were investigated in detail. The ultrafine, disc-shaped Fe(C) precipitates have sizes of 2-5 nm and possess a hexagonal close packed (hcp) crystal structure with lattice parameters a = 5.73 ± 0.05 Å, c = 12.06 ± 0.05 Å. They are in a well-defined Pitsch Schrader (P-S) orientation relationship with the basal plane of the precipitate parallel to the [110] habit plane of the surrounding body centred cubic (BCC) ferritic matrix. Detailed analysis of precipitate distribution, orientation relationship, lattice mismatch, and inter-particle spacing suggest that these ultrafine precipitates contribute considerably to the strengthening of these steels.

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Precipitation of VC in ferrite and pearlite during direct transformation of a medium carbon microalloyed steel

Cited by 60 publications

References 11 publications

Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels

Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels

Effects of Ferrite Growth Rate on Interphase Boundary Precipitation in V Microalloyed Steels

Novel ultrafine Fe(C) precipitates strengthen transformation-induced-plasticity steel

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