The mechanism of Martensite formation

Greninger, Alden B.; Troiano, A. R.

doi:10.1007/bf03398900

Cited by 151 publications

(155 citation statements)

References 2 publications

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“…Such a phenomenon is called as isothermal martensitic transformation. 4) Since the Ms temperature of Fe-16%Cr-10%Ni alloy is 330 K, isothermal martensitic transformation can be expected during holding at room temperature. Figure 4 0.2µm shows changes in volume fraction of martensite as a function of holding time at room temperature.…”

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confidence: 99%

Effect of Grain Refinement on Thermal Stability of Metastable Austenitic Steel

et al. 2004

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In martensitic steels, it is well known that a certain chemical driving force (about 180 MJ/m 3 ) is required to start martensitic transformation (Ms), and additional driving force has to be charged further to complete the transformation (Mf). In the case of metastable austenitic steels with Ms temperature at around room temperature, however, only the chemical driving force needed to start martensitic transformation has been stored at room temperature. Hence, the state of austenite is very unstable thermally. It has already been known that such a metastable austenite undergoes a partial martensitic transformation during isothermal holding at room temperature or cooling to a low temperature. It is very convenient to investigate the behavior of martensitic transformation of austenite. In this study, the effect of austenite grain size on martensitic transformation is introduced from the viewpoint of microstructural analysis and thermo-dynamics. The steel used in this investigation is an Fe-16 mass%Cr-10 mass%Ni ternary alloy, which has Ms temperature at around room temperature. The grain size of this steel can be controlled from 0.8 mm to 80 mm using the technique of reversion of deformation induced martensite. In the material with coarse grain size (80 mm), about 18% of martensite was detected at room temperature and the amount of martensite was increased to 50% by the following subzero treatment to 77 K. However, martensite was hardly detected in the material with ultra fine grains (0.8 mm) even after the subzero treatment. It was found that such a stabilization occurs in the materials with the grain size below 10 mm and the stabilization was reasonably explained by considering the relation between austenite grain size and elastic strain energy which is required on the single variant martensitic transformation.

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confidence: 99%

Effect of Grain Refinement on Thermal Stability of Metastable Austenitic Steel

et al. 2004

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“…[21] of (2 5 9) habit planes in steel with carbon content in the range 1.4 − 1.8 wt-% as well as the theoretical and experimental results in e.g. [9], [22] and [23] of (3 10 15) habit planes in highly tetragonal martensite. Coordinates of habit plane normal (blue, red, green) arising from simple twinning for different values of η 1 , η 2 .…”

Section: Single Shear Theoriesmentioning

confidence: 80%

The morphology of lath martensite: a new perspective

Koumatos¹,

Muehlemann²

2015

MATEC Web of Conferences

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Abstract. A mathematical framework is proposed to predict the features of the (5 5 7) lath transformation in low-carbon steels based on energy minimisation. This theory generates a one-parameter family of possible habit plane normals and a selection mechanism then identifies the (5 5 7) normals as those arising from a deformation with small atomic movement and maximal compatibility. While the calculations bear some resemblance to those of double shear theories, the assumptions and conclusions are different. Interestingly, the predicted microstructure morphology resembles that of plate martensite, in the sense that a type of twinning mechanism is involved.

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“…(b) The observed shape deformation cannot by itself effect the change in lattice [19]. There must therefore be a missing component whose effect is not observed because it is on a macroscopic scale cancelled by an inhomogeneous lattice-invariant deformation (slip or twinning).…”

Section: Crystallographymentioning

confidence: 98%