Non-uniform distribution of plastic strain in duplex steel during TEM in situ deformation

Zieliński, W.; Świątnicki, W.; Barstch, M.; Messerschmidt, U.

doi:10.1016/s0254-0584(03)00059-2

Cited by 39 publications

(14 citation statements)

References 7 publications

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“…Zielinski et al [19] studied the evolution of dislocation structure in a solution annealed DSS by in situ TEM straining experiment and reported that the evolution of dislocation structure during straining was dependent on the orientation relationship between the two phases. In the case of special orientation relationships, the slip markings in the ferrite, produced by the dislocations emitted from the boundary, indicate the compatibility of easy slip systems in the two phases, which favours a strong localization of strain.…”

Section: Tensile Behaviourmentioning

confidence: 99%

“…However, this grade of steel embrittles when exposed in the temperature range of 280-500 • C limiting its application to temperatures below 280 • C. This phenomenon is termed 475 • C embrittlement as the rate of embrittlement is highest at 475 • C [13][14][15]. The embrittlement changes the tensile [16][17][18][19][20][21][22], fracture [23][24][25][26][27][28][29][30][31][32] and fatigue [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]23,48,49] behaviour of this steel.…”

Section: Introductionmentioning

confidence: 99%

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Effect of 475°C embrittlement on the mechanical properties of duplex stainless steel

Sahu

Krupp

Ghosh

et al. 2009

Materials Science and Engineering: A

189

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Section: Tensile Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of 475°C embrittlement on the mechanical properties of duplex stainless steel

Sahu

Krupp

Ghosh

et al. 2009

Materials Science and Engineering: A

189

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“…Elongated J layers in the cold rolled specimen turns to a row of roughly equiaxed J grains separated from each other. Some authors 11 have reported that the phase boundaries play the key role in the plastic deformation. The elongated austenite grains show the signature of cold rolling operation, which was not recovered fully after isothermal treatment.…”

Section: Effect Of Heat Treatment On Microstructure Formationmentioning

confidence: 99%

Effect of heat treatment on microstructure and mechanical properties of duplex stainless steel

Ghosh

Mondal

2008

Trans Indian Inst Met

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Nowadays DSS products are obtained by different processes e.g., casting, forging, rolling etc. The microstructure and mechanical properties of the manufactured product strongly depend on the specific process. Present study aims to study the structural and associated mechanical property changes after the deformation and heat treatment. Thermomechanical processing, which combines both deformation and heat treatment is very effective for microstructure control and various treatments have been developed to improve the mechanical properties without sacrifice of corrosion resistance. However, thermomechanical treatment is still lacking in the field of stainless steel as compared to low and high alloyed carbon steels and hence it is attempted for the improvement of mechanical properties of materials. Attempts have also been made to study the effect of cold rolling prior to heat treatment on the investigated stainless steel. EXPERIMENTAL PROCEDUREThe duplex stainless steel was obtained as cast form with approximately 50 mm square cross section. Then the material was homogenised at 1200 o C for 120 minutes in a resistancereheating furnace. The homogenised ingots were forged into bars of 12.5 mm u 12.5 mm section with a reduction ratio of 1:16 using a pneumatic hammer of 1.0-ton capacity. The forged bars were soaked at 1200 o C and hot rolled in a laboratory scale two -high rolling mill (10 HP) with 750 o C finish rolling temperatures (FRT) down to a thickness of approximately 6 mm in three passes (Fig. 1). The FRT for the steel was fixed at 750 o C with an aim to incorporate approximately 10% deformation as was feasible under the experimental facility. After completion of rolling, samples were cooled in air. The chemical composition of the investigated steel is shown in Table 1. The material was heat treated in different schedules as described in Table 2.To study the microstructures, the samples were subjected to the standard grinding and polishing techniques before etching. The steel sample was etched using aqua regia solution (75% HCl and 25% HNO 3 mixture) 6 . Properly etched samples were examined under the ZEISS (Axiovert 40 MAT) optical microscope at different magnifications and representative photomicrographs were presented. Quantitative metallographic studies were also done using image -analysis technique in order to describe the microstructures. Microstructures have been quantified by the OLYSIA -m3 soft imaging system developed by Olympus. ABSTRACTPresent study concerns the effect of deformation and heat treatment on the microstructure and mechanical properties of a duplex stainless steel. While hot rolling causes the coarse distribution of the constituent phases (ferrite and austenite), 50% cold rolling results into the elongated and splintered two -phase structure. Supersaturated ferrite structure established by water quenching from 1300°C results into the strengthening due to the formation of fine dispersed austenite precipitates within ferrite grain after isothermal heat treatment (1000°C, 0.5 hour). Duplex s...

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“…The microstructure (strain heterogeneities) is of prime importance in damage and the initial crack [9]. The differences in behavior of each phase and the strain heterogeneities were studied by other authors using various techniques (SEM, TEM, EBSD, AFM) [10][11][12]. Strain heterogeneities between phases in duplex stainless steel were examined experimentally during in situ test using the EBSD technique and Digital Image Correlation (DIC) [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of plastic deformation heterogeneities in duplex steel by EBSD

Wroński

Tarasiuk

Bacroix

et al. 2012

Materials Characterization

104

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. A B S T R A C TAn EBSD analysis of a duplex steel (austeno-ferritic) deformed in tension up to fracture is presented. The main purpose of the paper is to describe, qualitatively and quantitatively, the differences in the behavior of the two phases during plastic deformation. In order to do so, several topological maps are measured on the deformed state using the electron backscatter diffraction technique. Distributions of grain size, misorientation, image quality factor and texture are then analyzed in detail.

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Non-uniform distribution of plastic strain in duplex steel during TEM in situ deformation

Cited by 39 publications

References 7 publications

Effect of 475°C embrittlement on the mechanical properties of duplex stainless steel

Effect of 475°C embrittlement on the mechanical properties of duplex stainless steel

Effect of heat treatment on microstructure and mechanical properties of duplex stainless steel

Investigation of plastic deformation heterogeneities in duplex steel by EBSD

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