A new fcc-bcc orientation relationship observed in the strain-induced martensitic transformation of an austenitic stainless steel

He, Yinsheng; Gao, Jianbing; He, Yizhu; Shin, Keesam

doi:10.1016/j.matlet.2021.130735

Cited by 14 publications

(2 citation statements)

References 10 publications

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“…In particular, the (1 1 1)γ was intensively converted to (1 1 0)α 0 , which is consistent with the relationship established early on by Kurdjumov-Sachs (K-S) for the martensite transformation in the iron alloy. [17] However, the transformation rate differed depending on the tensile direction and temperature conditions. Results from the peak-intensity variations of each phase, the α 0 -martensite formed faster when it was tensile along the RD or at cryogenic temperatures.…”

Section: Microstructural Evolutions During Tensile Deformationmentioning

confidence: 99%

Effect of Texture and Temperature on Strain‐Induced Martensitic Transformation in 304 Austenitic Stainless Steel

Lee

Noh

Kim

et al. 2022

steel research int.

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The austenitic stainless steel's remarkable mechanical properties are caused by twinning‐induced plasticity and transformation‐induced plasticity mechanisms. Numerous studies focus on stacking fault energy's effect, which is affected by various factors, to interpret and control these mechanisms. However, crystallographic orientation is also an important parameter for mechanical properties in metals. This study compares the mechanical properties and microstructural features of 304 austenitic stainless steel, focusing on the effect of initial texture and deformation temperature. Microstructural characterization is identified by an interrupted tensile test based on strain, tensile direction, and temperature conditions, and X‐ray diffraction and electron back‐scattered diffraction analysis are performed. The results show that the mechanical features and strain‐induced martensitic transformation rate depend on the tensile directions. In addition, this trend is maintained irrespective of the temperature conditions. The attribute reason is that the difference in the Taylor factor and the formation rate of the deformed band structure is induced by the initial crystallographic orientations. Moreover, a decrease in temperature significantly increases the dislocation densities and abundant twins and transformed martensites formation. Furthermore, the yield and tensile strengths are enhanced while the elongation decreased with the tensile strains.

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Section: Microstructural Evolutions During Tensile Deformationmentioning

confidence: 99%

Effect of Texture and Temperature on Strain‐Induced Martensitic Transformation in 304 Austenitic Stainless Steel

Lee

Noh

Kim

et al. 2022

steel research int.

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show abstract

“…The deformation-induced martensitic transformation is influenced by many factors, such as: temperature, the degree and method of deformation, as well as the chemical composition, size and crystallographic orientation of the austenite grain [20,21]. The instability of austenite depends on the stacking fault energy (SFE), which is influenced by the chemical composition and temperature [22][23][24]. If the steel was deformed below the temperature M d30/50 then a phase transformation induced by deformation took place in the steel.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Cold Deformation and Annealing on Texture Changes in Austenitic Stainless Steel

Kowalska,

Witkowska

2024

Adv. Sci. Technol. Res. J.

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Austenitic stainless steels are widely used in industry, from heavy industry and power generation to precision mechanics and electronics, accounting for about 2/3 of the stainless steels produced. The stability of austenite influences the properties and behaviour of these steels during deformation and annealing. This paper presents the results of research into austenitic metastable phase X5CrNi1810 steel, which was subjected to cold rolling (in the range of 5 to 80%) and then annealing (at temperatures of 500-900 °C). The research focused mainly on changes in crystallographic texture parameters occurring during the analysed processes. It was found that the observed development of the deformation texture is complex due to the fact that several processes take place simultaneously. Namely, the deformation of austenite, the transformation of austenite into martensite, and the deformation of the resulting martensite. The texture of the deformed austenite was similar to the texture of the alloy type {112}<110>. After 80% deformation, the Goss-type {110}<001> texture component showed the highest intensity. The lack of {112}<111> orientation in the texture was due to the fact that this orientation changes to the {112}<110> martensite orientation as a result of the γ → α' phase transition. Annealing of the deformed steel at 500 °C led to an increase in the degree of texturing (sharpening of the texture), which was related to the improvement of the texture in this temperature range. Above 600 °C, the degree of texturing decreased, which is directly related to the α' → γ reverse transformation and the subsequent recrystallization process. Magnetic studies indicate an increasing proportion of the magnetic phase α' (martensite) together with an increasing degree of deformation. For deformation of 80%, the amount of magnetic phase reached a value of more than 33%. After annealing at a temperature of 800 °C, there is no martensite in the structure, which indicates that, in these heat treatment conditions, the complete reverse transformation of martensite into austenite has already taken place.

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Deformation microstructures and martensitic transformation pathways in cryogenically deformed 316L stainless steel

Li,

Withers,

Deng

et al. 2024

J Mater Sci

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Liquefied gas storage and transportation, as well as space propulsion, are driving increasing interest in the cryogenic temperature deformation behaviour of 316L stainless steels. This was investigated here during tensile deformation at 15, 50 and 173 K. Complex transformation pathways, including one-step γ-austenite → α′-martensite, two steps γ → ε-martensite → α′ transformation as well as twinning and stacking fault-assisted γ → α′ transformation, are observed. γ grains with a (111) plane normal direction aligned 50–65°from the loading direction appear more likely to form the ε phase. Further, high-resolution transmission Kikuchi diffraction mapping revealed that the nucleation process of α′ can be assisted by ε and stacking faults at all cryogenic temperatures, whereas twins can also serve as sites for α′ nucleation when deformed at 173 K. For two-step transformation, separate lenticular α′ nucleate following Kurdjumov–Sachs orientation relationship (OR) within the shear band, once grown out of the shear band, Pitsch OR is preferable. As for one-step transformation, irregular oval α′ nucleates directly at γ grain boundaries with Nishiyama–Wassermann OR. These findings provide new insights into the correlation between the various transformation pathways and deformation mechanisms, as well as their improved performance at low temperatures.

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A new fcc-bcc orientation relationship observed in the strain-induced martensitic transformation of an austenitic stainless steel

Cited by 14 publications

References 10 publications

Effect of Texture and Temperature on Strain‐Induced Martensitic Transformation in 304 Austenitic Stainless Steel

Effect of Texture and Temperature on Strain‐Induced Martensitic Transformation in 304 Austenitic Stainless Steel

The Influence of Cold Deformation and Annealing on Texture Changes in Austenitic Stainless Steel

Deformation microstructures and martensitic transformation pathways in cryogenically deformed 316L stainless steel

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