Effects of austenitizing temperature and austenite grain size on the formation of athermal martensite in an iron-nickel and an iron-nickel-carbon alloy

Umemoto, Minoru; Owen, W. S.

doi:10.1007/bf02644497

Cited by 161 publications

(53 citation statements)

References 3 publications

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“…Several studies on the effect of prior austenite grain size (PAGS) on martensite transformation have been reported. [8][9][10][11][12] The PAGS affects M s temperature strongly and directly, as decreasing the PAGS also decreases the M s temperature. The grain boundaries of prior austenite could act as nucleation sites for martensite transformation.…”

Section: Introductionmentioning

confidence: 98%

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

Lee

Tyne

2011

Metall Mater Trans A

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An empirical martensite kinetics model is proposed that both captures the sigmodial transformation behavior for alloy steels and remains computationally efficient. The model improves on the Koistinen and Marburger model and the van Bohemen and Sietsma model with a function that better represents the transformation rate, especially during the early stages. When compared with existing models, the proposed model exhibits better predictions of volume fraction of martensite. The proposed model also predicts various other transformation properties accurately, such as M 90 temperatures and retained austenite.

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Section: Introductionmentioning

confidence: 98%

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

Lee

Tyne

2011

Metall Mater Trans A

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“…They related their observation of a size effect in superelastic hysteresis to the increased pinning of the transformation front at free surfaces; the cross-over from volume to surface dominated physics was shown to take place in wires with diameters around, or just below, 100 µm. Another example of size dependent behavior in SMAs is that of polycrystalline SMAs, where several alloy families show a decrease in M s with decreasing grain size [60][61][62][63][64][65]. Interestingly, these effects also show little or no size dependence for large grains, but start to emerge for grain sizes below ∼100 µm.…”

Section: Obstacle Density and Morphologymentioning

confidence: 99%

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Ueland

Schuh

2013

Acta Materialia

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“…It was reported that Ms temperature decreases with decrease of austenite grain size. 13,16) However, the Ms temperature of the ultrafinegrained austenite was relatively high even though the grain size of the ultrafine-grained austenite is significantly small when compared with the coarse-grained and fine-grained austenites. Because dislocation can act as a nucleation site for martensitic transformation, 17) the relatively high Ms temperature of the ultrafine-grained austenite was attributable to the existence of high density of dislocations and low angle boundaries inside the austenite grain as shown in Figs.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Crystallographic Features of Martensite Transformed from Ultrafine-Grained Austenite in Fe–24Ni–0.3C Alloy

2012

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We studied microstructure and crystallographic features, especially orientation relationship, of martensite transformed from austenite with mean grain sizes ranging from 35 µm to 750 nm in an Fe24Ni0.3C alloy. The austenite structures with ultrafine or fine grains were fabricated through intense straining by accumulative roll-bonding process and subsequent annealing. The morphology of martensite transformed from the austenite with various grain sizes was all lenticular type. On the other hand, the martensite plate size decreased with the decrease in the austenite grain size. The orientation relationship of martensite transformed from coarse-grained austenite with mean grain size (d) of 35 µm changed depending on the location within martensite plate: i.e., it was GreningerTroiano relationship at the center part of each martensite plate, while it changed to KurdjumovSachs relationship near the interphase boundary. In contrast, the whole area of each martensite plate, transformed from fine-grained austenite (d = 2.5 µm) and ultrafine-grained austenite (d = 750 nm), satisfied GreningerTroiano relationship. Furthermore, high density of dislocations and low angle boundaries within the ultrafine-grained austenite resulted in a large scatter of observed orientation relationship.

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Effects of austenitizing temperature and austenite grain size on the formation of athermal martensite in an iron-nickel and an iron-nickel-carbon alloy

Cited by 161 publications

References 3 publications

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Microstructure and Crystallographic Features of Martensite Transformed from Ultrafine-Grained Austenite in Fe–24Ni–0.3C Alloy

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Effects of austenitizing temperature and austenite grain size on the formation of athermal martensite in an iron-nickel and an iron-nickel-carbon alloy

Cited by 161 publications

References 3 publications

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

A Kinetics Model for Martensite Transformation in Plain Carbon and Low-Alloyed Steels

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Microstructure and Crystallographic Features of Martensite Transformed from Ultrafine-Grained Austenite in Fe&ndash;24Ni&ndash;0.3C Alloy

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Microstructure and Crystallographic Features of Martensite Transformed from Ultrafine-Grained Austenite in Fe–24Ni–0.3C Alloy