The Fatigue Properties of Duplex Stainless Steels: Role of Microstructure

Vogt, Jean

doi:10.4028/www.scientific.net/kem.378-379.101

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The cyclic softening of the austenitic phase is compensated by a secondary hardening in the ferritic phase resulting in a secondary hardening of the DSS. Such behaviour is also reported in [10].…”

Section: Discussionsupporting

confidence: 62%

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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Section: Discussionsupporting

confidence: 62%

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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“…A similar trend has also been observed in a few other studies. [101][102][103][104] The ε pl at strain transition from austenite to ferrite phase depends on parameters such as phase fractions, alloying elements, and so on. Austenite stabilizing elements such as nitrogen result in solid solution strengthening.…”

Section: Fatigue Behavior Of Medium-mn Steelsmentioning

confidence: 99%

A Systematic Review of Medium‐Mn Steels with an Assessment of Fatigue Behavior

Kumar,

Sen,

Bandyopadhyay

2023

steel research int.

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Deformation‐induced mechanisms, namely, transformation‐induced plasticity (TRIP) and twinning‐induced plasticity (TWIP), are primarily responsible for improved tensile properties in medium‐Mn steels. Additionally, lower density and processing costs make these steels useful in various industries, particularly the automotive industry, which mandates a good understanding of underlying processing–microstructure–property correlations. Therefore, the present study reviews different thermomechanical processes and corresponding microstructural evolutions, followed by mechanical properties. In addition, an assessment of the fatigue behavior of medium‐Mn steels based on duplex or multiphase microstructure and associated mechanisms has been presented. In high‐cycle fatigue (HCF) loading, strain‐induced martensite formation through TRIP at the crack tip is a barrier to dislocation motion. It deviates the crack propagation path to adjacent phases, which results in higher fatigue life. On the other hand, relatively high martensite boundaries initiate microcracks and accelerate crack propagation, resulting in lower life in low‐cycle fatigue (LCF). However, the TWIP mechanism prevents cyclic softening and promotes cyclic saturation, extending fatigue life. The compositions of medium‐Mn steel for enhanced fatigue resistance have been proposed. To that end, it is hypothesized that the TRIP + TWIP mechanisms lead to exceptional LCF performance. Further, microalloyed medium‐Mn steels are expected to exhibit improved LCF and HCF behavior.

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