Pearlite growth rate in Fe–C and Fe–Mn–C steels

Seo, Seung-Woo; Bhadeshia, H. K. D. H.; Suh, Dong‐Woo

doi:10.1179/1743284714y.0000000641

Cited by 28 publications

(9 citation statements)

References 33 publications

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“…Most importantly, the growth rate is very large, which can be tens of microns per second and the transformation happens in a narrow temperature range, Fig. 6, consistent with reports from literature [35][36][37][38][39][40][41][42]. Bainite follows the same trend, and the rise in temperature is about 7 ¶ C. The exception is martensite, which was assumed to be athermal, therefore, the volume fraction only depends on temperature, and the release of latent heat only reduces the cooling rate, making the time to reach the same temperature longer.…”

Section: Recalescence E Ect On the Microstructuresupporting

confidence: 89%

Modelling of recalescence effect on austenite decomposition

Guo

Roelofs

Lembke³

et al. 2017

Materials Science and Technology

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A model for recalescence has been established by integrating a model for the decomposition of austenite and one dealing with heat transfer with latent heat release taken into account. The e ects of recalescence on each individual austenite transformation product has been studied. It was found that Widmanstätten ferrite and pearlite reactions are most a ected. The calculated cooling curve as a ected by the recalescence has also been verified with a commercial steel subjected to two di erent environment conditions.

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Section: Recalescence E Ect On the Microstructuresupporting

confidence: 89%

Modelling of recalescence effect on austenite decomposition

Guo

Roelofs

Lembke³

et al. 2017

Materials Science and Technology

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“…It has also been noticed that at a 4 • C/s cooling rate, there are fractions of ferrite present in the microstructure, as shown in Figure 5b. Seo et al argue that this kind of ferrite formation, shown in the FESEM micrograph of Figure 5b, is the reason for breakdown in the pearlite growth [27]. However, from 3 to 1 • C/s cooling rates, the microstructure was complete pearlite along with pro-eutectoid ferrite at the grain boundaries.…”

Section: Microstructures At Different Cooling Ratesmentioning

confidence: 94%

“…Seo et al mentions that the component of diffusivity D , which provides insight into the carbon diffusion behavior at different pearlite transformation temperatures, is given in Equation (2) [27].…”

Section: Pearlite Nucleationmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Mechanical Properties in the CGHAZ of Electroslag Welded Pearlitic Rail Steel

Khan

Shi

Wang

et al. 2019

Metals

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The effect of cooling rate, ranging from 6 to 1 °C/s, on microstructure and mechanical properties in the coarse-grained heat affected zone (CGHAZ) of electroslag welded pearlitic rail steel has been investigated by using confocal scanning laser microcopy (CSLM) and Gleeble 3500 thermo-mechanical simulator. During heating, the formed austenite was inhomogeneous with fractions of untransformed ferrite, which has influenced the pearlite transformation during cooling by providing additional nucleation sites to pearlite. During cooling, at 6 °C/s, the microstructure was composed of martensite and bainite with little pearlite. From 4 to 1 °C/s, microstructures were completely pearlite. Lowering the cooling rate of the CGHAZ from 4 to 1 °C/s increased the pearlite start temperature and reduced the pearlite growth rate. Meanwhile, this increase in pearlite start temperature enlarged the pearlite interlamellar spacing. Alternatively, increasing pearlite interlamellar spacing in the CGHAZ by lowering the cooling rate from 6 to 1 °C/s reduced the hardness and tensile strength, whereas toughness was found unaffected by the pearlite interlamellar spacing. It has been found that a cooling rate of 4 °C/s leads to the formation of pearlite with fine interlamellar spacing of 117 nm in the CGHAZ of electroslag welded pearlitic rail steel where hardness is 425 HV, tensile strength is 1077 MPa, and toughness is 9.1 J.

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“…As a result, the edgewise growth rate of cementite lamellae is difficult to be maintained, and the ferrite and cementite no longer share a common transformation front, which leads to the formation of rod-like or granular cementite. [30] In the present work, the experimental steel in condition #3 was cooled at a rate of approximately 10 K/s to 953 K (680°C) from the final rolling temperature 1103 K (830°C), whereas the experimental steel in condition #1 was cooled at a rate of approximately 0.5 K/s from the final rolling temperature of 1093 K (820°C) to room temperature. In other words, the pearlite transformation was suppressed to lower temperature in condition #3.…”

Section: Resultsmentioning

confidence: 99%

Microstructure of Hot Rolled 1.0C-1.5Cr Bearing Steel and Subsequent Spheroidization Annealing

Liu

Zhang

et al. 2016

Metall Mater Trans A

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The effect of final rolling temperature and cooling process on the microstructure of 1.0C-1.5Cr bearing steel was studied, and the relationship between the microstructure parameters and subsequent spheroidization annealing was analyzed. The results indicate that the increase of water-cooling rate after hot rolling and the decrease of final cooling temperature are beneficial to reducing both the pearlite interlamellar spacing and pearlite colony size. Prior austenite grain size can be reduced by decreasing the final rolling temperature and increasing the water-cooling rate. When the final rolling temperature was controlled around 1103 K (830°C), the subsequent cooling rate was set to 10 K/s and final cooling temperature was 953 K (680°C), the precipitation of grain boundary cementite was suppressed effectively and lots of rod-like cementite particles were observed in the microstructure. Interrupted quenching was employed to study the dissolution behavior of cementite during the austenitizing at 1073 K (800°C). The decrease of both pearlite interlamellar spacing and pearlite colony size could facilitate the initial dissolution and fragmentation of cementite lamellae, which could shorten the spheroidization time. The fragmentation of grain boundary cementite tends to form large-size undissolved cementite particles. With the increase of austenitizing time from 20 to 300 minutes, mean diameter of undissolved cementite particles increases, indicating the cementite particle coarsening and cementite dissolution occuring simultaneously. Mean diameter of cementite particles in the final spheroidized microstructure is proportional to the mean diameter of undissolved cementite particles formed during partial austenitizing.

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Pearlite growth rate in Fe–C and Fe–Mn–C steels

Cited by 28 publications

References 33 publications

Modelling of recalescence effect on austenite decomposition

Modelling of recalescence effect on austenite decomposition

Effect of Cooling Rate on Microstructure and Mechanical Properties in the CGHAZ of Electroslag Welded Pearlitic Rail Steel

Microstructure of Hot Rolled 1.0C-1.5Cr Bearing Steel and Subsequent Spheroidization Annealing

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