In-situ characterization of the microstructure evolution during cyclic deformation of novel cast TRIP steel

Weidner, Anja; Glage, Alexander; Biermann, Horst

doi:10.1016/j.proeng.2010.03.211

Cited by 38 publications

(17 citation statements)

References 18 publications

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“…7 (b)). Within these deformation bands, the bcc α'‐martensite nucleates 19, 20. Thus, it is concluded that the martensitic phase transformation in these alloys occurs via the ε‐martensite, i.e.…”

Section: Deformation Microstructurementioning

confidence: 94%

Cyclic Deformation Behaviour of Three Austenitic Cast CrMnNi TRIP/TWIP Steels with Various Ni Content

Glage

Weidner

Biermann

2011

steel research int.

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This study presents the cyclic deformation behaviour of three high‐alloyed austenitic cast steels which are characterized by different chemical compositions leading to different austenite stabilities and stacking fault energies. Thus, depending on the chemical composition different deformation mechanisms arise which have a significant influence on the cyclic deformation behaviour and life time relations. The materials were characterized under total‐strain control. The fatigue life relations of Basquin and Manson‐Coffin are applied successfully for all steel variants. The cyclic stress‐strain response is described using the Ramberg‐Osgood relationship. It is shown that the parameters n' and K' depend strongly on the accumulated plastic strain λp. The mechanical properties are discussed together with microstructural investigations of deformation structures and martensitic transformations as well as twinning, respectively.

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Section: Deformation Microstructurementioning

confidence: 94%

Cyclic Deformation Behaviour of Three Austenitic Cast CrMnNi TRIP/TWIP Steels with Various Ni Content

Glage

Weidner

Biermann

2011

steel research int.

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“…In references [19][20][21], it was shown that the hexagonally indexed regions (usually called ε-martensite) are formed by a high density of stacking faults. These bands and their intersection points are nucleation sites for α'-martensite (blue) with a size in the order of few μm or less [19,22] as shown by the orientation map in Figure 1c.…”

Section: Introductionmentioning

confidence: 95%

Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

Weidner¹,

Hangen²,

Biermann³

2014

Philosophical Magazine Letters

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2014) Nanoindentation measurements on deformation-induced α'-martensite in a metastable austenitic high-alloy CrMnNi steel, Philosophical Magazine Letters, 94:8, 522-530,The hardness of deformation-induced α'-martensite and parent austenitic matrix in high-alloy CrMnNi steel was investigated by nanoindentation measurements inside scanning electron microscope using picoindenter. After the indentation, the microstructure was investigated by electron backscattered diffraction measurements. The hardness values for α'-martensite are only 24% higher than those of austenite. Thus, the increase in strength during the formation of deformation-induced α'-martensite is rather caused by the small grain size of α'-nuclei resulting in a dynamic Hall-Petch effect than by its "intrinsic" hardness.

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“…In TRIP steels, the dominating mechanism is the martensitic phase transformation from the face centered cubic (fcc) austenite into the body centered cubic (bcc) α′‐martensite9, 10. This transformation can also occur via an intermediate state of deformation bands which are closely packed with extended stacking faults 11–15. In these deformation bands, a hexagonal closed‐packed (hcp) structure develops if stacking faults arrange on every second lattice plane16 which is called ε‐martensite in literature.…”

Section: Introductionmentioning

confidence: 99%

SEM Investigation of High‐Alloyed Austenitic Stainless Cast Steels With Varying Austenite Stability at Room Temperature and 100°C

Biermann

Solarek

Weidner

2012

steel research int.

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The deformation mechanisms of high‐alloyed cast austenitic steels with 16% of chromium, 6% of manganese, and a nickel content of 3–9% were investigated by in situ and ex situ scanning electron microscopy. The austenite stability and the stacking fault energy were influenced by variation of the chemical composition as well as by changing deformation temperature (room temperature; RT and 100°C). The study shows that both an increase in austenite stability and stacking fault energy yield a significant change in the deformation mechanisms. Both increase of nickel content and increase in deformation temperature reduce the intensity of the martensitic phase transformation. Thus, the steel with low nickel content shows at RT pronounced formation of α′‐martensite. The steel with the highest nickel content, however, shows pronounced twinning.

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In-situ characterization of the microstructure evolution during cyclic deformation of novel cast TRIP steel

Cited by 38 publications

References 18 publications

Cyclic Deformation Behaviour of Three Austenitic Cast CrMnNi TRIP/TWIP Steels with Various Ni Content

Cyclic Deformation Behaviour of Three Austenitic Cast CrMnNi TRIP/TWIP Steels with Various Ni Content

Nanoindentation measurements on deformation-induced α’-martensite in a metastable austenitic high-alloy CrMnNi steel

SEM Investigation of High‐Alloyed Austenitic Stainless Cast Steels With Varying Austenite Stability at Room Temperature and 100°C

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