In‐Situ Study of the Microstructure Development in a CrMnNi TRIP Steel During Plastic Deformation

Borisova, Daria; Klemm, Volker; Schreiber, Gerhard; Rafaja, David

doi:10.1002/srin.201100088

Cited by 4 publications

(7 citation statements)

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“…The onset of the plastic deformation was already observed at very low deformations levels (0.1–0.2% deformation, 190–200 MPa for the investigated steel) that corresponds to the gliding of single dislocations, which requires the stresses of 10 −4 –10 −2 × G, where G is the shear modulus (77 GPa for the TRIP steel 16‐6‐6). Later on at about 0.2–0.5% deformation and mechanical stress of about 200–210 MPa, the multiple dislocation gliding occurs on several {111} lattice planes of austenite.…”

Section: Microstructure Defects and Their Configurationsmentioning

confidence: 93%

“…Increasing deformation induces the increase of the SF density and arrangement of the SF into the deformation bands on the gliding planes, which are, in the fcc lattice of the austenite, the crystallographic planes {111} with the highest atomic density. The beginning of the deformation bands development has been evidenced already after about 1–1.5% deformation and stress of 220–230 MPa, isolated deformation bands were observed in TEM after 3% deformation …”

Section: Microstructure Defects and Their Configurationsmentioning

confidence: 97%

“…For the arrangement of microstructure defects that precedes the formation of the defect agglomerates in the austenite, following processes play a crucial role: i) the splitting of perfect dislocations into two PDs that is the formation of individual SF and ii) the propagation and ordering of the SF …”

Section: Microstructure Defects and Their Configurationsmentioning

confidence: 99%

“…The interactions of the microstructure defects during the deformation of TRIP/TWIP steels have rarely been investigated in detail. Still, a combination of in situ X‐ray diffraction (in situ XRD), ex situ scanning electron microscopy with back scattered electron diffraction (SEM/EBSD) and ex situ TEM was performed for the TRIP steel containing about 16 wt% Cr, 6 wt% Ni, and 6 wt% Mn . These experiments revealed the formation of defect structures at the beginning of the plastic deformation.…”

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confidence: 99%

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Microstructure Defects Contributing to the Energy Absorption in CrMnNi TRIP Steels

et al. 2013

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Freiberg for the hot rolled TRIP steel samples. For the metallographic sample preparation we would like to thank Mrs. Dipl.-Ing. A. Mueller, Mrs. K. Becker; for the conventional preparation of TEM samples and the FIB preparation of TEM samples on Infineon, Dresden we would like to thank Mrs. Dipl.-Ing. A. Leuteritz.Microstructure defects control the TRIP effect and/or the TWIP effect and contribute significantly to the absorption of deformation energy in plastically deformed austenitic CrMnNi steels. In this study, the propagation and interaction of dislocations, stacking faults and twins connected with the formation of Lomer-Cottrell locks, stacking fault tetrahedra, dislocation clusters, deformation bands, microtwins with high-energy incoherent twin boundaries and the nucleation of a 0martensite in the areas of the high local lattice strain due to the fluctuation of the stacking fault density and the lattice shearing, were analysed in the CrMnNi TRIP steel after different deformation extents via transmission electron microscope with high resolution and via scanning electron microscope. ADVANCED ENGINEERING MATERIALS 2013, 15, No. 7

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Section: Microstructure Defects and Their Configurationsmentioning

confidence: 93%

Section: Microstructure Defects and Their Configurationsmentioning

confidence: 97%

Section: Microstructure Defects and Their Configurationsmentioning

confidence: 99%

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confidence: 99%

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Microstructure Defects Contributing to the Energy Absorption in CrMnNi TRIP Steels

et al. 2013

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“…The thin film (sample #2) was deformed with the aid of a four‐point bending device from Kammrath & Weiss. The sample #2 was bent step by step up to the load of 264 N, which led to the true tensile strain in the sample of about 1.2% at the stress of 390 MPa.…”

Section: Methodsmentioning

confidence: 99%

Interface Phenomena Responsible for Bonding between TRIP Steel and Partially Stabilised Zirconia as Revealed by TEM

et al. 2013

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Metal Matrix Composites (MMCs) consisting of an austenitic steel with the TRIP effect as the metallic component and PSZ as the ceramic component are designed as new construction materials for special applications, in which a high energy absorption is necessary. [1][2] Zirconia can be partially stabilized (PSZ) at room temperature by the addition of e.g. MgO, CaO, Y 2 O 3 to form tetragonal stabilized zirconia (t-ZrO 2 ) and cubic stabilized zirconia (c-ZrO 2 ). [3] Analytical transmission electron microscopy (TEM) has been effectively used in many investigations of bulk PSZ [3][4] and PSZ thin films on different substrates such as Si wafers, glass, stainless steel. [5][6][7][8] McComb compared t-ZrO 2 and c-ZrO 2 with monoclinic ZrO 2 using analytical TEM in his study. [3] Information about the metastable phases of ZrO 2 can be obtained from the shape of the electron energy-loss spectra. [3] Backhaus-Ricoult studied (La,Sr)MnO 3 -3YSZ (yttrium oxide stabilised zirconia) interface in composite cathode using analytical TEM. [4] Cavallaro et al. investigated multilayers containing YSZ [6] and Chraska et al. [7] analysed plasma sprayed YSZ layers on stainless steel substrate using analytical TEM, too. In a previous study, [8] it was shown using the transmission electron microscopy with high resolution (HRTEM) that the cubic form of ZrO 2 can be stabilized by the local heteroepitaxy between the austenitic steel and the intrinsically non-stabilized zirconia. Later on, this finding was supported by the ab initio calculation based on the density functional theory, which verified a possible chemical bonding at a doped Fe/ZrO 2 interface. [9] In this study we summarise the results of TEM investigations of phenomena on the interface between PSZ and TRIP steel in PSZ thin films deposited on TRIP steel substrates (model system) and in bulk sample prepared via Spark Plasma Sintering (SPS). The zirconia in the samples was partially stabilized with Y 2 O 3 in the thin films and with MgO in the SPS sample. The microstructure of the thin films was investigated in the as-deposited state (sample #1) and after deformation with the aid of a four-point bending device (sample #2). In more details, the microstructure of three samples was investigated on the micro-and nanoscale using TEM with HRTEM and STEM. EDX and EELS in STEM were executed for the local analysis of chemical composition and the phase analysis on the interface between PSZ and TRIP steel at the nanoscale. ExperimentalFor the investigation of interfaces between TRIP steel and PSZ using TEM, three samples were prepared. Two samples were deposited as thin films of (Zr,Y)O 2 on TRIP steel substrates by magnetron sputtering. The first sample (sample #1) was used to prove, whether the stabilised phase c-ZrO 2 can be deposited on the steel substrate by magnetron sputtering. The second sample (sample #2) was prepared for a bending test and subsequent microstructure characterization in order to investigate defect microstructures near the interfaces and possible phase transformatio...

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Fatigue behavior of an ultrafine-grained metastable CrMnNi steel tested under total strain control

Droste

Ullrich

Motylenko

et al. 2018

International Journal of Fatigue

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In‐Situ Study of the Microstructure Development in a CrMnNi TRIP Steel During Plastic Deformation

Cited by 4 publications

References 12 publications

Microstructure Defects Contributing to the Energy Absorption in CrMnNi TRIP Steels

Microstructure Defects Contributing to the Energy Absorption in CrMnNi TRIP Steels

Interface Phenomena Responsible for Bonding between TRIP Steel and Partially Stabilised Zirconia as Revealed by TEM

Fatigue behavior of an ultrafine-grained metastable CrMnNi steel tested under total strain control

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