Cyclic stress–strain behavior and load sharing in duplex stainless steels: Aspects of modeling and experiments

Lillbacka, Robert; Chai, Guocai; Ekh, Magnus; Liu, P.; Johnson, Erland; Runesson, Kenneth

doi:10.1016/j.actamat.2007.05.056

Cited by 40 publications

(18 citation statements)

References 18 publications

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“…It is reported that the ac phase boundary offers more resistance to slip transfer as compared to aa and cc grain boundaries. Lillbacka et al [9] conducted cyclic experiments on two different grades of super DSS, UNS S32750 and UNS S32906. The UNS S32750 grade of DSS was studied in as-delivered (2507AD) and as-aged (475°C/4 h) (2507HT) condition and UNS S32906 was studied only in the as-delivered (2906AD) condition.…”

Section: Discussionmentioning

confidence: 99%

“…The low cycle and high cycle fatigue behavior of DSSs in ambient air, corrosive environment and at high temperature were studied extensively [1][2][3]. In recent years progress was made in understanding the fatigue crack initiation behavior in low cycle fatigue (LCF) and high cycle fatigue (HCF) regimes in DSSs [4][5][6][7][8][9][10]. This has assumed significance as microstructure based fatigue life prediction is widely attempted for a number of metallic alloys for accuracy and better predictability.…”

Section: Introductionmentioning

confidence: 99%

“…In DSSs the presence of two phases affects the evolution of surface roughness, subsequent nucleation and growth of short fatigue cracks during cyclic loading [7][8][9]. Therefore, the fatigue crack initiation behavior in DSS is strongly influenced by the microstructural parameters such as grain size and grain orientation, grain and phase boundary geometry, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Sahu¹,

Krupp²,

Christ³

2012

International Journal of Fatigue

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Sahu¹,

Krupp²,

Christ³

2012

International Journal of Fatigue

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“…Duplex stainless steels (DSS) beneficially combining the mechanical properties of both ferritic and austenitic phases in terms of strength, ductility and corrosion resistance are increasingly employed in highly aggressive environments such as nuclear power plants, automobile, chemical and petrochemical industries as a potential alternative to austenitic stainless steels (ASS) [1][2][3][4][5][6]. The structural components usually suffer alternative loadings resulting from the variable temperature fields and corresponding high stress fields.…”

Section: Introductionmentioning

confidence: 99%

Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205

Chen

2018

MATEC Web Conf.

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Abstract. Effects of mean strain and tensile pre-strain were investigated on the torsional fatigue behaviours of duplex stainless steel SAF2205. Two equivalent strain amplitudes (0.5%,0.7 %), three strain ratios (-1, -0.5, -0.25) and 5% tensile pre-strain were chosen. Results indicated that the mean strain had no distinct influences on the torsional fatigue behaviours in terms of cyclic stress reponse and fatigue life while tensile pre-straining made a significant increase in cyclic stress response which was mainly attributed to the cross hardening derived from the loading sequence of monotonic tension preceding to cyclic torsion and led to a reduction in fatigue life. The failure mechanisms were revealed by scanning electron microscope characterized by microcracks initiation at the extrusions in ferrite and phase boundary inhibited further propagation. Additionally, the fractography of all fatigued specimens revealed a quasi-cleavage brittle mode with features of distinct tearing ridges and cleavage facets.

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“…Therefore, in recent years, great effort has been made toward exploring a framework within which the information regarding various internal stresses can be incorporated into the design of materials used in various critical industries. [4][5][6] The neutron diffraction technique is a well established tool for studying micromechanical behavior of materials. [7,8] Because of the selective nature of diffraction techniques, the elastic (lattice) strain of the specified grain populations of each phase with their (hkl) crystal planes along the macroscopic specimen directions may be experimentally determined, which enables us to separate the elastic response of different phases during deformation.…”

Section: Introductionmentioning

confidence: 99%

Tensile Deformation Behavior of Duplex Stainless Steel Studied by In-Situ Time-of-Flight Neutron Diffraction

Jia

Peng

Brown

et al. 2008

Metall Mater Trans A

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For a duplex alloy being subjected to deformation, the different mechanical behaviors of its constituent phases may lead to a nonuniform partition of stresses between phases. In addition, the grain-orientation-dependent elastic/plastic anisotropy in each phase may cause grain-tograin interactions, which further modify the microscopic load partitioning between phases. In the current work, neutron diffraction experiments on the spectrometer for materials research at temperature and stress (SMARTS) were performed on an austenite-ferrite stainless steel for tracing the evolution of various microstresses during tensile loading, with particular emphasis on the load sharing among grains with different crystallographic orientations. The anisotropic elastic/plastic properties of the duplex steel were simulated using a visco-plastic self-consistent (VPSC) model that can predict the phase stress and the grain-orientation-dependent stress. Material parameters used for describing the constitutive laws of each phase were determined from the measured lattice strain distributions for different diffraction {hkl} planes as well as the laboratorial macroscopic stress-strain curve of the duplex steel. The present investigations provide in-depth understanding of the anisotropic micromechanical behavior of the duplex steel during tensile deformation.

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Cyclic stress–strain behavior and load sharing in duplex stainless steels: Aspects of modeling and experiments

Cited by 40 publications

References 18 publications

Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Fatigue crack initiation behavior in embrittled austenitic–ferritic stainless steel

Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205

Tensile Deformation Behavior of Duplex Stainless Steel Studied by In-Situ Time-of-Flight Neutron Diffraction

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