Influence of small additions of copper and niekel on hot ductility of steels

Mintz, B.; Abushosha, R.; Crowther, D. N.

doi:10.1179/mst.1995.11.5.474

Cited by 33 publications

(54 citation statements)

References 11 publications

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“…Work by Mintz and Arrowsmith [127] has however, shown that the deterioration in hot ductility is progressive throughout the range 0.004 to 0.011%N and changes in ductility are relatively small, Fig.2.48. This is probably because an increase in the nitrogen level will have only a small influence on the volume fraction of Nb(C, N) that is precipitated out.…”

Section: Niobiummentioning

confidence: 93%

Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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The hot ductility of twin induced plasticity (TWIP), 0·6 wt-C steels containing 18–22 wt-Mn with N levels in the range 0·005–0·023 wt- and the Al additions either low (<0·05 wt-) or high (1·5 wt-) has been examined. Little change in ductility occurred in the temperature range 1100–650°C as the structure was always fully austenitic. Ductility was generally poor (<40), reduction of area values, the best ductility at the higher Al level being given by the steel with the lowest N and S levels. Because the steel is fully austenitic, the ductility is solely dependent on that for unrecrystallised austenite. Therefore, to avoid transverse cracking the volume of second phase particles should be kept to a minimum, i.e. the N should be low to reduce the amount of AlN that can be precipitated out and the S level should be as low as possible to limit the amount of MnS inclusions. Metallographic and TEM studies were carried out and the poor ductility was found to be due to extensive precipitation of AlN at the austenite grain boundaries. Increasing the cooling rate from the melting point to the test temperature from 60 to 180°C min−1 or introducing an undercooling step both led to even worse ductility.

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Section: Niobiummentioning

confidence: 93%

Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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“…Mintz et al [92] did not find any evidence for Cu rich films penetrating along the austenite grain boundaries, ruling out conventional hot shortness as the cause for ductility loss.…”

Section: Influence Of Residual and Alloying Elementsmentioning

confidence: 99%

“…[89,91] With regard to the hot ductility, the effect of Cu has not been studied extensively in the temperature range 700 to Il OO°C. [2,9,88,92] Hannerz [88] could find no significant effect of copper levels up to 1% at temperatures above 700°C, in plain C-Mn steel reheated to 1350°C and cooled at 60°Cmin-1 to the test temperature in an argon atmosphere. Below 700°C, ductility was impaired, possibly due to copper precipitation from 1 % Cu solution.…”

Section: Influence Of Residual and Alloying Elementsmentioning

confidence: 99%

“…Mintz et al [92] have performed some experiments on the effect of test conditions on the hot ductility with regard to copper and nickel. No effect of Cu or Ni was found on the hot ductility when the steels were solution treated at 1330°C and cooled to the test temperature, regardless as to whether a protective or oxidizing atmosphere was used.…”

Section: Influence Of Residual and Alloying Elementsmentioning

confidence: 99%

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Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

Zarandi¹,

Yue²

2005

Materials Science Forum

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“…At equal level of Nb, Al, Ti or V alloying, the precipitates are soluble in austenite as follows (Turkdogan, 1989): TiN<AlN<NbN<VN. On the other hand the presence of AlN in the austenite generates harmful effects on the hot-ductility of different kinds of steels (Mintz and Arrowsmith, 1980).…”

Section: Introductionmentioning

confidence: 99%

Precipitation model in microalloyed steels both isothermal and continuous cooling conditions

Medina¹,

Quispe²,

Gómez³

2015

REVMETAL

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Niobium and vanadium precipitates (nitrides and carbides) can inhibit the static recrystallization of austenite but this does not happen for Ti, which form nitrides at high temperatures. RPTT diagrams show the interaction between recrystallization and precipitation allowing study the strain induced precipitation kinetics and precipitate coarsening. Based on Dutta and Sellars's expression for the start of strain-induced precipitation in microalloyed steels, a new model has been constructed which takes into account the influence of variables such as microalloying element percentages, strain, temperature, strain rate and grain size. RecrystallizationPrecipitation-Time-Temperature (RPTT) diagrams have been plotted thanks to a new experimental study carried out by means of hot torsion tests on approximately twenty microalloyed steels with different Nb, V and Ti contents. Mathematical analysis of the results recommends the modification of some parameters such as the supersaturation ratio (k s ) and constant B, which is no longer a constant but a function of k s . The expressions are now more consistent and predict the Precipitation-Time-Temperature (PTT) curves with remarkable accuracy. The model for strain-induced precipitation kinetics is completed by means of Avrami's equation. Finally, the model constructed in isothermal testing conditions, it has been converted to continuous cooling conditions in order to apply it in hot rolling. RESUMEN: Modelo de precipitación en aceros microaleados tanto en condiciones isotérmicas como de enfriamiento continuo.Los precipitados de V y Nb (nitruros y carburos) pueden inhibir la recristalización estática de la austenita, pero no sucede lo mismo con el Ti que forma nitruros a altas temperaturas. Los diagramas RPTT muestran la interacción entre la recristalización y la precipitación, permitiendo estudiar la ciné-tica de la misma y el crecimiento de los precipitados. Partiendo de la expresión de Dutta y Sellars se ha construido un modelo para la precipitación inducida por la deformación en aceros microaleados. El nuevo modelo toma en cuenta la influencia de las variables que intervienen en la deformación a alta temperatura, tales como los porcentajes de elementos microaleantes, la magnitud de la deformación, la temperatura, la velocidad de deformación y el tamaño de grano. Los diagramas Recristalización-Precipitación-TiempoTemperatura (RPTT) fueron dibujados gracias a un estudio realizado por medio de ensayos de torsión con aproximadamente 20 aceros con diferentes contenidos de V, Nb y Ti. El análisis matemático de los resultados recomienda, entre otros aspectos, la modificación de algunos parámetros tales como la relación de supersaturación (k s ) y de la constante B que pasa a ser una función de k s . El modelo es ahora más consistente y predice los diagramas Precipitación-Tiempo-Temperatura (PTT) con mayor exactitud. El modelo de cinética de precipitación es completado con la ecuación de Avrami. Finalmente, el modelo construido en condiciones isotérmicas es convertido ...

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Influence of small additions of copper and niekel on hot ductility of steels

Cited by 33 publications

References 11 publications

Hot ductility of TWIP steels

Hot ductility of TWIP steels

Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

Precipitation model in microalloyed steels both isothermal and continuous cooling conditions

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