Different Cooling Rates and Their Effect on Morphology and Transformation Kinetics of Martensite

Eggbauer, Annika; Ressel, Gerald; Gruber, M.; Prevedel, Petri; Marsoner, S.; Stark, Andreas; Ebner, R.

doi:10.1007/978-3-319-76968-4_6

Cited by 4 publications

(9 citation statements)

References 11 publications

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“…Since microstructure size effects can contribute to an increase in hardness, we investigated how the quenching intensity affects the microstructure scales. For the same material, an influence of the cooling rate on the resulting block size was determined in [22]. However, with a comprehensive evaluation of the sizes of the hierarchical microstructure, no significant systematic influence of the cooling rate could be identified.…”

Section: Discussionmentioning

confidence: 99%

“…For the experimental investigations in this work, referring to previous studies, the material 50CrMo4 (SAE 4150) is used [1,22,40,41]. For the sake of completeness, mean values of the chemical composition are documented in Table 1.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

“…The lath size is almost insensitive to changes in the prior austenite grain sizes [14,18]. Furthermore, higher cooling rates can lead to finer packet and block structures [19][20][21][22][23][24]. However, no size effect with regard to the cooling rate was found in [25].…”

Section: Introductionmentioning

confidence: 99%

“…It was concluded that subsequent simultaneous block formation is influenced by thermally activated local stress relaxation. Based on [22], it can be argued that the quenching rate influences the volume fraction gradient concerning temperature. With shorter cooling times, more martensite is formed at lower temperatures, which means a higher resistance against lattice displacement, resulting in higher stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the orientations, the cross-sections of martensite blocks are reconstructed and analyzed. In addition to [22], the CPPs and PAGs are reconstructed based on the martensite orientation relationship. With this method, sections of the microstructure on the scale of representative volume elements can be evaluated, resulting in a statistically significant amount of data.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation of Size Effects Due to Different Cooling Rates of As-Quenched Martensite Microstructures in a Low-Alloy Steel

et al. 2020

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Martensite transformation is a complex mechanism in materials that is classically initiated by a suitable heat treatment. This heat treatment process can be optimized based on a better understanding of the physical mechanisms on the length scale of several prior austenite grains. It is therefore appropriate to consider individual process steps of heat treatment in isolation. The aim of this study is to characterize the microstructural size changes caused by a variation of the cooling rate applied during the quenching process. For this purpose, individual martensitic microstructures from different heat treatments are analyzed using the electron backscatter diffraction (EBSD) method. With special orientation relationships between the parent austenite and martensite, the structure of the prior austenite grains and the close packet plane packets can then be reconstructed. The influence of the heat treatments on these characteristics as well as on the martensite blocks is thus quantified. No significant influence of the quenching rate on the sizes of martensite blocks and packets could be found.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Setup and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Size Effects Due to Different Cooling Rates of As-Quenched Martensite Microstructures in a Low-Alloy Steel

et al. 2020

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Simulation of martensitic microstructures in a low-alloy steel

et al. 2021

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Evolution of Martensite Tetragonality in High-Carbon Steels Revealed by In Situ High-Energy X-Ray Diffraction

Kohne

Fahlkrans

Stormvinter

et al. 2023

Metall Mater Trans A

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The martensitic transformation was studied by in situ and ex situ experiments in two high-carbon, 0.54 and 0.74 wt pct C, steels applying three different cooling rates, 15 °C/s, 5 °C/s, and 0.5 °C/s, in the temperature range around Ms, to improve the understanding of the evolution of martensite tetragonality c/a and phase fraction formed during the transformation. The combination of in situ high-energy X-ray diffraction during controlled cooling and spatially resolved tetragonality c/a determination by electron backscatter diffraction pattern matching was used to study the transformation behavior. The cooling rate and the different Ms for the steels had a clear impact on the martensitic transformation with a decrease in average tetragonality due to stronger autotempering for a decreasing cooling rate and higher Ms. A slower cooling rate also resulted in a lower fraction of martensite at room temperature, but with an increase in fraction of autotempered martensite. Additionally, a heterogeneous distribution of martensite tetragonality was observed for all cooling rates.

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Different Cooling Rates and Their Effect on Morphology and Transformation Kinetics of Martensite

Cited by 4 publications

References 11 publications

Investigation of Size Effects Due to Different Cooling Rates of As-Quenched Martensite Microstructures in a Low-Alloy Steel

Investigation of Size Effects Due to Different Cooling Rates of As-Quenched Martensite Microstructures in a Low-Alloy Steel

Simulation of martensitic microstructures in a low-alloy steel

Evolution of Martensite Tetragonality in High-Carbon Steels Revealed by In Situ High-Energy X-Ray Diffraction

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