Quantitative analysis of variant selection in ausformed lath martensite

Miyamoto, Gorō; Iwata, Naomichi; Takayama, Naoki; Furuhara, Tadashi

doi:10.1016/j.actamat.2011.11.018

Cited by 116 publications

(53 citation statements)

References 33 publications

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“…Therefore, the active slip planes in γ are calculated from reconstructed γ orientation and traces of them are shown in Figs highest Schmidt factors are indexed as (111)γ and ( -111)γ, respectively. It seems that lath blocks tend to grow along the active slip planes, which is in good agreement with ausformed low-carbon martensite 10) and upper bainite.…”

Section: Resultssupporting

confidence: 62%

“…10) It was clarified that the variants formed with habit planes nearly parallel to the active slip planes in γ are dominant, 10) which is in good agreement with ausformed bainitic ferrite.…”

Section: Introductionmentioning

confidence: 67%

“…1(c) by using the reconstruction program. 9) In ausformed lath martensite or upper bainite structures, 10,11) it was reported that habit planes of favorably formed variants tend to be parallel to the active slip planes of γ, i.e., {111}γ the planes belonging to the slip systems with the highest or second highest Schmidt factors for compression. Therefore, the active slip planes in γ are calculated from reconstructed γ orientation and traces of them are shown in Figs highest Schmidt factors are indexed as (111)γ and ( -111)γ, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In this method, the γ orientation, Figure 4 shows the variant fractions of lath martensite in the Fe-9Mn alloy and lenticular martensite in the Fe-25Ni-0.5C alloy with and without ausforming. Variant fractions obtained from ausformed carbon martensite 10) are also shown in Fig. 4(d) for comparison purposes.…”

Section: )mentioning

confidence: 99%

“…Based on the orientation data of martensite and γ at various ausforming strains, the fraction of 24 variants were quantified using a method previously used by Miyamoto et al 10) The 24 variants can be classified into four variant groups according to the parallel relation in the close-packed planes (CP) ({111}γ//{011}α′). In this method, the γ orientation, Figure 4 shows the variant fractions of lath martensite in the Fe-9Mn alloy and lenticular martensite in the Fe-25Ni-0.5C alloy with and without ausforming.…”

Section: )mentioning

confidence: 99%

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Comparison of Variant Selection between Lenticular and Lath Martensite Transformed from Deformed Austenite

Chiba

Miyamoto

2013

ISIJ Int.

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A variant selection of ausformed lath martensite in an Fe-9Mn alloy (MS = 602 K) and ausformed lenticular martensite in an Fe-25Ni-0.5C alloy (MS = 220 K) are compared quantitatively using EBSD measurements combined with a method for the reconstruction of austenite orientation. Differences were found in the selected variants by ausforming between those two martensite morphologies. In ausformed lath martensite, variants with habit planes parallel to the active slip planes in austenite were preferentially selected. This variant selection in lath martensite may be attributed to the preferential nucleation on the microband structures in austenite and lack of growth inhibition from the microband boundaries. On the other hand, in ausformed lenticular martensite, variants with habit planes parallel to the compression plane were preferentially selected. The reason for this is that lenticular martensite whose habit plane is parallel to the compression plane can grow easily in austenite grains elongated along the compression plane. This means fewer disturbances for those variants to grow with a habit plane parallel to the compression plane than for other variants.

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Section: Resultssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Comparison of Variant Selection between Lenticular and Lath Martensite Transformed from Deformed Austenite

Chiba

Miyamoto

2013

ISIJ Int.

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Characteristics of Deformation Induced Martensite in SUS304 Austenitic Stainless Steel Deformed at RT and −60°C

Chen¹,

Gao²,

Terada³

et al. 2013

Pricm

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Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Wang

Hua

Kong

et al. 2016

Microsc. Res. Tech.

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In the present work, ultra-high-strength steels with multiphase microstructures containing martensite and bainite were prepared by controlling the cooling rate. A new approach was proposed for quantitatively statistical phase analysis using electron backscatter diffraction (EBSD) based on the band contrast which correlates to the quality and intensity of the diffraction patterns. This approach takes advantage of the inherently greater lattice imperfections of martensite, such as dislocations and low-angle grain boundaries, relative to that of bainite. These can reduce the intensity and quality of the EBSD patterns of martensite, which decrease the band contrast. Thus, combined with morphological observations, Gaussian two-peak fitting was employed to analyze the band contrast profile and confirm the ranges of band contrast for the two phases. The volume fractions of bainite and martensite in different samples were determined successfully. In addition, the results show that increased cooling rates improve the proportion of martensite and the ratio of martensite to bainite. Microsc. Res. Tech. 79:814-819, 2016. © 2016 Wiley Periodicals, Inc.

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Quantitative analysis of variant selection in ausformed lath martensite

Cited by 116 publications

References 33 publications

Comparison of Variant Selection between Lenticular and Lath Martensite Transformed from Deformed Austenite

Comparison of Variant Selection between Lenticular and Lath Martensite Transformed from Deformed Austenite

Characteristics of Deformation Induced Martensite in SUS304 Austenitic Stainless Steel Deformed at RT and −60°C

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

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