A kinetic model of lath martensite formation

Mirzayev, D. A.; Счастливцев, В. М.; Ul'yanov, V. G.; Karzunov, S.Ye.; Yakovleva, I. L.; Okishev, K. Yu.; Khlebnikova, Yu. V.

doi:10.1051/jp4:2003852

Cited by 2 publications

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“…The two kinds of critical cooling rates were evaluated from similar graphs for the remaining 30 binary or ternary Fe alloys, [5][6][7][8][9][10][11][12] utilizing the first experimental point on the M P s line for v 0 cr and the last experimental point on the M L s line for v 00 cr . The values were read off a scanned copy of Figure 1 and the other graphs using the Plotdigitizer software.…”

Section: Critical Time For Complete Formation Of Lath Martensitementioning

confidence: 99%

“…The same parameter values can be inserted in Eq. [12] to act as model for hypothetical isothermal martensite of the same material. It is particularly interesting to compare the predicted Q quantities for the two kinds of martensite on the same material.…”

Section: ½13mentioning

confidence: 99%

“…from a partial derivative of Eq. [12] under constant C content. For lath martensite, Q Fe-C is obtained as a partial derivative of Eq.…”

Section: ½13mentioning

confidence: 99%

“…Exceptions have been classified as isothermal martensite. [1][2][3][4] A Russian group [5][6][7][8][9][10][11][12] instead applied ultra-rapid quenching on steels that could then form both lath and plate martensite. They found that the formation of lath martensite can be suppressed by very high cooling rates, and the rate of formation should, thus, be limited although at a very high level.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation and Modeling of the Rate of Formation of Lath Martensite in Fe-C Alloys, Extracted from Ultra-Rapid Quenching Experiments

Kumpati,

Hillert,

Borgenstam

2024

Metall Mater Trans A

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Isothermal information is rarely available for the formation of martensite in Fe or Fe alloys due to a very high rate of transformation compared to the rate of heat conduction. Such information has now been extracted for lath martensite in some sets of Fe alloys from available information on ultra-rapid quenching but only at a single temperature for each alloy, related to its two MS temperatures. The temperature dependence could, thus, be studied only on binary sets of alloys. Those results have been applied to mathematical models based on the Arrhenius equation and illustrated with Arrhenius plots. For three sets of binary Fe alloys, a large group of rates came close to the rate of an almost pure and carbon-free Fe-C alloy. It illustrated that Cr, Ni, and Ru in low contents have relatively small effects on the rate of formation of lath martensite in Fe. It also demonstrated that the present measurements have considerable reproducibility. In contrast, a set of Fe-C alloys did not give a straight line in the Arrhenius plot. Using a new mathematical model based on the concept of the Arrhenius equation to express the effect of carbon, it was possible to predict the rate of formation of lath martensite for Fe-C alloys with fixed C content and their temperature dependencies which are not available experimentally due to the very high rate of formation.

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Section: Critical Time For Complete Formation Of Lath Martensitementioning

confidence: 99%

Section: ½13mentioning

confidence: 99%

“…from a partial derivative of Eq. [12] under constant C content. For lath martensite, Q Fe-C is obtained as a partial derivative of Eq.…”

Section: ½13mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation and Modeling of the Rate of Formation of Lath Martensite in Fe-C Alloys, Extracted from Ultra-Rapid Quenching Experiments

Kumpati,

Hillert,

Borgenstam

2024

Metall Mater Trans A

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“…The B s temperature is very sensitive to residual carbon levels, 21,70,71) ϳ11 000 K/%C, whereas the M s for lath martensite and the M s for twinned martensite are relatively insensitive; ϳ380 K/%C and ϳ206 K/%C respectively. 72) It is not clear what is happening between 360°C and the B s of 315°C, and it will require further work to clarify what mode of transformation is occurring in this temperature interval.…”

Section: Transformation Temperaturesmentioning

confidence: 99%

A Kinetic and Electronmicroscopic Study of Transformations in Continuously Cooled Fe-15%Ni Alloys.

2001

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Koistinen and Marburger's equation relating volume fraction of athermal martensite to temperature has been applied to diffusional transformation dilatometry data obtained on continuous cooling Fe-15%Ni alloys. After austenitising for 1 h at 1 000°C and cooling at 50 K/min (0.83 K/s), grain boundary nucleated massive ferrite was observed which developed into Widmanstätten ferrite with a ferrite habit plane of {110} b for temperatures between 372°C and 352°C. On cooling at 44 K/s from 1 000°C bainitic ferrite was observed for temperatures below 360°C. There was some retained austenite in this bainitic structure giving a ferrite habit plane of {110} b parallel to the austenite plane {111} f . Cooling at the same rate, 44 K/s from 1 200°C gave lath martensite below the M s of 261°C with a ferrite habit plane of {112} b . Superlattice spots corresponding to the DO 3 or B2 structure were observed in electron diffraction patterns on cooling at 50 K/min (0.83 K/s) and 44 K/s from 1 000°C.

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A kinetic model of lath martensite formation

Cited by 2 publications

References 0 publications

Evaluation and Modeling of the Rate of Formation of Lath Martensite in Fe-C Alloys, Extracted from Ultra-Rapid Quenching Experiments

Evaluation and Modeling of the Rate of Formation of Lath Martensite in Fe-C Alloys, Extracted from Ultra-Rapid Quenching Experiments

A Kinetic and Electronmicroscopic Study of Transformations in Continuously Cooled Fe-15%Ni Alloys.

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