The transition from interphase-precipitated carbides to fibrous carbides in a vanadium-containing medium-carbon steel

Chen, Meng-Yang; Yen, Hung‐Wei; Yang, Jue

doi:10.1016/j.scriptamat.2013.01.020

Cited by 32 publications

(25 citation statements)

References 19 publications

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“…Interphase precipitation was believed to be nucleated at the immobile semicoherent terraces of the austenite/ferrite interface and delineate the prior positions of the austenite/ferrite interface [4,5]. Further analysis indicated that the morphologies of interphase precipitate carbides could be separated into three types: planar interphase precipitation with regular sheet spacing (PIP); curved interphase precipitation with regular sheet spacing (CIP); and curved interphase precipitation with irregular sheet spacing (irregular CIP) [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that Mo can retarded interphase precipitation during isothermal heat treatment, via the classical interphase precipitation mechanism [8,10,12,13,16,17,[29][30][31][32][33]. Early results focused on the study of the physical and chemical properties of transition metal carbides such as (M,Mo)C, where M is Nb, V, Ti [5,18,19,27,34]. However, little research has focused on the effect of Mo on the final microstructure in terms of ferrite grain size and precipitate size and volume fraction and thereby final mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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%

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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“…This may be the reason for the increase in row spacing in the present work. Moreover, Chen et al [25] suggested that γ→α transformation becomes sluggish in the late ferrite transformation, the growth of carbides nucleated in the step plane was compatible with the movement of the transformation front. Therefore, randomly dispersed carbide precipitation can be obtained in this instance.…”

Section: Nanometer-sized Precipitationmentioning

confidence: 99%

Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel

Xie

Song

Chen

et al. 2019

Metals

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Nanometer-sized precipitated carbides in a low carbon Ti-V-Mo bearing steel were obtained through hot rolling and air cooling and were investigated by transmission electron microscopy (TEM). The nanometer-sized interphase-precipitated carbides have been found to exhibit an average diameter of ~6.1 ± 2.7 nm, with an average spacing of ~24–34 nm. Yield strength of 578 ± 20 MPa and tensile strength of 813 ± 25 MPa were achieved with high elongation of 25.0 ± 0.5% at room temperature. The nanometer-sized precipitation exhibited high stability after annealing at high temperatures of 600 °C and 650 °C for 3 h. Average diameters of carbides were statistically measured to be ~6.9 ± 2.3 nm and 8.4 ± 2.6 nm after tempering at high temperatures of 600 °C and 650 °C, respectively. The micro-hardness was ~263–268 HV0.1 after high temperature tempering, which was similar to the hot-rolled sample (273 HV0.1), and yield strength of 325 ± 13 MPa and 278 ± 4 MPa was achieved at elevated temperatures of 600 °C and 650 °C, respectively. The significant decrease of yield strength at 650 °C was attributed to the large decrease in shear modulus.

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“…5) Interphase precipitated carbides have often been observed in steels containing strong carbide formers such as Nb, Ti, V or Cr, whereas fiber-like carbides are often observed in steels containing weak carbide formers such as Mo. 23) However, the experimental result that the carbide morphology can change abruptly in one ferrite grain 5,24) allows the mobility of the interphase between austenite and ferrite to affect the carbide morphology.…”

Section: Interphase Precipitated Carbidementioning

confidence: 99%

Interphase Precipitation and Application to Practical Steels

Funakawa¹

2019

Mater. Trans.

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Interphase precipitation is a phenomenon in which precipitates are generated on interphase boundaries during phase transformation, creating carbides having a form like bands or fibers in micro-alloyed steels. In isothermal transformation, a lower transformation temperature reduces the carbide diameter and band spacing, and a higher cooling rate reduces them in the continuous cooling process. Various interphase precipitation mechanisms have been suggested, and some models for the ledge mechanism attempted to explain the regular band spacing in steels containing carbide-forming elements quantitatively. Recently, as the orientation relationship in the grains of the interphase boundary is not consistent with the ledge mechanism, three-dimensional interface structures have been suggested to explain the experimental results of observation by transmission electron microscopy in low carbon steel. The newly-proposed interphase structure model may explain both the ledge and quasi-ledge mechanisms. Steels with tensile strength of more than 590 MPa, which are manufactured by using interphase precipitated carbides, have been developed and used practically not only in plate and sheet products but also in forged products to improve formability. In steels consisting of ferrite and a second hard phase, interphase precipitated carbides are used to realize high local ductility and to reduce the difference of hardness between the two phases. Ferritic steels strengthened by nanometer-sized carbides are developed to achieve excellent formability, realizing precipitationstrengthening of more than 300 MPa.

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The transition from interphase-precipitated carbides to fibrous carbides in a vanadium-containing medium-carbon steel

Cited by 32 publications

References 19 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

Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel

Interphase Precipitation and Application to Practical Steels

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