Thermo-mechanical fatigue behaviour of a duplex stainless steel

Kolmorgen, R.; Biermann, Horst

doi:10.1016/j.ijfatigue.2011.10.005

Cited by 18 publications

(15 citation statements)

References 13 publications

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“…The reasons for these observations have recently been clarified by the phenomenon of interaction of carbon atoms with dislocations. 10) Since the warm-rolling temperature of 698 K is well within the reported dynamic strain aging regime of DSS alloys 11) carbon atoms can readily lock the dislocations resulting in increased flow stress, suppression of grain sub-division and mechanical fragmentation of grains which are consistent with the fragmented microstructure present in the A0 specimen ( Fig. 1(b)).…”

Section: Evolution Of Microstructure and Texture Duringsupporting

confidence: 64%

Evolution of Microstructure and Texture during Isothermal Annealing of a Heavily Warm-rolled Duplex Steel

Ahmed

Bhattacharjee

2014

ISIJ Int.

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The evolution of microstructure and texture during isothermal annealing of a heavily warm-rolled duplex steel (DSS) was studied. For this purpose a DSS steel was hot rolled, homogenized at 1 448 K and subsequently warm-rolled to 90% reduction in thickness at 698 K and 898 K. This was followed by isothermal annealing at 1 448 K for different time intervals up to 7 200 seconds. Lamellar microstructure with alternate arrangement of deformed ferrite and austenite bands was observed in the as warm-rolled condition.The ferrite in DSS warm-rolled at 698 K showed much stronger α-fiber (Rolling direction (RD)//<110>) than γ -fiber (Normal direction (ND)//<111>) as compared to the ferrite in DSS warm-rolled at 898 K. The austenite in warm-rolled DSS showed a predominantly pure metal (or copper type) texture. Upon annealing the lamellar morphology of the as warm-rolled structure transformed into a bamboo type morphology for short annealing time but finally broke down with increasing isothermal annealing time due to mutual interpenetration of the two phases. Retention of deformation texture components and presence of annealing twins in austenite indicated discontinuous recrystallization. Despite differences of texture in the as warm-rolled condition the ferrite in annealed DSS showed much stronger α-fiber as compared to γ -fiber due to strong recovery behavior of ferrite during annealing. The texture evolution in the two phases was not affected by the presence of the other phase while grain growth was significantly restricted due to the presence of the other phase.

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Section: Evolution Of Microstructure and Texture Duringsupporting

confidence: 64%

Evolution of Microstructure and Texture during Isothermal Annealing of a Heavily Warm-rolled Duplex Steel

Ahmed

Bhattacharjee

2014

ISIJ Int.

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“…Remarkably low HAGB fraction and fragmented microstructure observed after 90 pct warm rolling at 698 K (425°C) are in very good agreement with the above observations. In contrast, the microstructures at the two end warm-rolling temperatures show characteristics of more grain subdivision (finely subdivided structure in both the phases) [23,24] and much less mechanical fragmentation of grains.…”

Section: A Evolution Of Microstructurementioning

confidence: 86%

“…This would lead to increased hardness of ferrite, and difference in hardness of the two phases would lead to strain being partitioned more to austenite resulting in the average thickness of austenite phase bands being less than that of the ferrite bands also observed experimentally. The increased hardness of ferrite would further result in the suppression of grain subdivision due to the process of slip, [23,24] but increased mechanical fragmentation of grains at the vicinity of phases' interfaces. Remarkably low HAGB fraction and fragmented microstructure observed after 90 pct warm rolling at 698 K (425°C) are in very good agreement with the above observations.…”

Section: A Evolution Of Microstructurementioning

confidence: 99%

Evolution of Microstructure and Texture During Warm Rolling of a Duplex Steel

Bhattacharjee

Zaid

Sathiaraj

et al. 2013

Metall Mater Trans A

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The effect of warm rolling on the evolution of microstructure and texture in a duplex stainless steel (DSS) was investigated. For this purpose, a DSS steel was warm rolled up to 90 pct reduction in thickness at 498 K, 698 K, and 898 K (225°C, 425°C, and 625°C). The microstructure with an alternate arrangement of deformed ferrite and austenite bands was observed after warm rolling; however, the microstructure after 90 pct warm rolling at 498 K and 898 K (225°C and 625°C) was more lamellar and uniform as compared to the rather fragmented and inhomogeneous structure observed after 90 pct warm rolling at 698 K (425°C). The texture of ferrite in warm-rolled DSS was characterized by the presence of the RD (h011i//RD) and ND (h111i//ND) fibers. However, the texture of ferrite in DSS warm rolled at 698 K (425°C) was distinctly different having much higher fraction of the RD-fiber components than that of the ND-fiber components. The texture and microstructural differences in ferrite in DSS warm rolled at different temperatures could be explained by the interaction of carbon atoms with dislocations. In contrast, the austenite in DSS warm rolled at different temperatures consistently showed pure metal-or copper-type deformation texture which was attributed to the increase in stacking fault energy at the warm-rolling temperatures. It was concluded that the evolution of microstructure and texture of the two constituent phases in DSS was greatly affected by the temperature of warm rolling, but not significantly by the presence of the other phase.

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“…by Llanes et al [4] and Sahu et al [5]. In a recent work, the authors presented the fatigue lives of the DSS and the respective single-phase steels under in-phase and out-of-phase TMF, and low-cycle fatigue loading [6]. In the present work, the focus is on the detailed analysis of the microstructural changes of the DSS under out-of-phase TMF by means of scanning electron microscopy and micro-hardness measurements.…”

Section: Introductionmentioning

confidence: 99%

Deformation and microstructure evolution of a duplex stainless steel under out-of-phase thermo-mechanical fatigue

Kolmorgen

Weidner

Biermann

2013

Materials at High Temperatures

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Thermo-mechanical fatigue (TMF) of the duplex stainless steel SAF2205 (X2CrNiMoN22-5-3) was studied in the temperature range of 100-350°C. The tests were carried out on the duplex steel and on single-phase ferritic (X6Cr17, AISI 430) and austenitic steels (X2CrNiMo18-14-3, AISI 316L) similar to the two phases of the duplex steel for comparison. The mechanical behaviour of the three steels is analysed and discussed together with microstructural investigations by scanning electron microscopy, including electron backscatter diffraction and electron channelling contrast imaging.

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Thermo-mechanical fatigue behaviour of a duplex stainless steel

Cited by 18 publications

References 13 publications

Evolution of Microstructure and Texture during Isothermal Annealing of a Heavily Warm-rolled Duplex Steel

Evolution of Microstructure and Texture during Isothermal Annealing of a Heavily Warm-rolled Duplex Steel

Evolution of Microstructure and Texture During Warm Rolling of a Duplex Steel

Deformation and microstructure evolution of a duplex stainless steel under out-of-phase thermo-mechanical fatigue

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