Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk X-ray study of the grain-averaged and single-grain behavior

Tian, Yuan; Lienert, U.; Borgenstam, Annika; Fischer, Torben; Hedström, Peter

doi:10.1016/j.scriptamat.2017.04.020

Cited by 22 publications

(11 citation statements)

References 27 publications

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“…9a and b), where a lower activation energy is needed for the formation of α' [25]. This is in agreement with our previous observations on single-phase austenitic alloys [52]. After extensive deformation, much of the γ has then transformed to α' (Fig.…”

Section: Deformation Behaviour Of Individual Constituentssupporting

confidence: 92%

“…Considering the ε phase in TDSS, it appears in significantly lower fractions as compared to our previous investigations of single-phase austenitic alloys but with similar tendency for α' formation [25]. This could be attributed to the much lower driving force for γ to ε and comparable driving force for γ to α' for TDSS at RT compared with single-phase austenitic alloys [52]. But it should also be kept in mind that the calculations of driving force for multicomponent alloys can be uncertain and here we therefor only consider the relative order between the alloys.…”

Section: Deformation Behaviour Of Individual Constituentssupporting

confidence: 51%

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Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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Two transformation-induced plasticity (TRIP) assisted duplex stainless steels, with three different stabilities of the austenite phase, were investigated by synchrotron X-ray diffraction characterization during in situ uniaxial tensile loading. The micromechanics and the deformation-induced martensitic transformation (DIMT) in the bulk of the steels were investigated in situ. Furthermore, scanning electron microscopy supplemented the in situ analysis by providing information about the microstructure of annealed and deformed specimens. The dependence of deformation structure on austenite stability is similar to that of single-phase austenitic steels where shear bands and bcc-martensite (α') are generally observed, and blocky α' is only frequent when the austenite stability is low. These microstructural features, i.e. defect structure and deformation-induced martensite, are correlated with the micro-and macro-mechanics of the steels with elastoplastic load transfer from the weaker phases to the stronger α', in particular this occurs close to the point of maximum rate of α' formation. A clear strain-hardening effect from α' is seen in the most unstable austenite leading to a pronounced TRIP effect.

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Section: Deformation Behaviour Of Individual Constituentssupporting

confidence: 92%

Section: Deformation Behaviour Of Individual Constituentssupporting

confidence: 51%

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Tian

Lin

et al. 2018

Materials Science and Engineering: A

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“…Band-like structures resulting from faulted areas in the austenite act as precursors for ε-martensite. Although these observations correspond to the transformation during incremental cooling, the sequence could also be applied to the strain-induced transformation [11]. Other authors, on the other hand, conclude that ε-martensite and α -martensite form independently during straining [14,16].…”

Section: The Strain-induced Martensitic Transformation and Stepwise Bmentioning

confidence: 87%

“…In this sense, in-situ measurements are a more suitable option to investigate the martensitic transformation kinetics. Both stress-and strain-induced types of martensitic transformation have been studied by means of complex, in-situ techniques such as neutron diffraction or HEXRD [8,9,11]. The information provided by these techniques is very accurate and reliable, but it is also localized.…”

Section: Comparing Techniques To Desctibe the Martensitic Transformatmentioning

confidence: 99%

In-Situ Investigation of Strain-Induced Martensitic Transformation Kinetics in an Austenitic Stainless Steel by Inductive Measurements

Celada-Casero

Kooiker

Groen

et al. 2017

Metals

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An inductive sensor developed by Philips ATC has been used to study in-situ the austenite (γ) to martensite (α) phase transformation kinetics during tensile testing in an AISI 301 austenitic stainless steel. A correlation between the sensor output signal and the volume fraction of α-martensite has been found by comparing the results to the ex-situ characterization by magnetization measurements, light optical microscopy, and X-ray diffraction. The sensor has allowed for the observation of the stepwise transformation behavior, a not-well-understood phenomena that takes place in large regions of the bulk material and that so far had only been observed by synchrotron X-ray diffraction.

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“…The tensile strength of these materials can be increased by means of rolling at room temperature which causes austenite(γ)-to-martensite transformation during plastic deformation [1][2][3][4][5][6][7][8]. The martensitic transformation is related to the austenite stability which varies with the Cr and Ni contents of ASSs [9,10]. Angel et al determined the austenite stability by M d (30/50) temperature [11], i.e., the temperature at which 50% of the austenite transforms into martensite during tensile testing at a true strain of 0.3, as shown in the following equation: Higher M d (30/50) temperatures mean greater instability of the austenite.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Fatigue Crack Growth Behavior and Fracture Surface Roughness on Cold-Rolled Austenitic Stainless Steels in Gaseous Hydrogen

Chen

Tsay

et al. 2018

Metals

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Austenitic stainless steels are often considered candidate materials for use in hydrogencontaining environments because of their low hydrogen embrittlement susceptibility. In this study, the fatigue crack growth behavior of the solution-annealed and cold-rolled 301, 304L, and 310S austenitic stainless steels was characterized in 0.2 MPa gaseous hydrogen to evaluate the hydrogenassisted fatigue crack growth and correlate the fatigue crack growth rates with the fracture feature or fracture surface roughness. Regardless of the testing conditions, higher fracture surface roughness could be obtained in a higher stress intensity factor (∆K) range and for the counterpart cold-rolled specimen in hydrogen. The accelerated fatigue crack growth of 301 and 304L in hydrogen was accompanied by high fracture surface roughness and was associated with strain-induced martensitic transformation in the plastic zone ahead of the fatigue crack tip.

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Martensite formation during incremental cooling of Fe-Cr-Ni alloys: An in-situ bulk X-ray study of the grain-averaged and single-grain behavior

Cited by 22 publications

References 27 publications

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels

In-Situ Investigation of Strain-Induced Martensitic Transformation Kinetics in an Austenitic Stainless Steel by Inductive Measurements

Correlation between Fatigue Crack Growth Behavior and Fracture Surface Roughness on Cold-Rolled Austenitic Stainless Steels in Gaseous Hydrogen

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