Effect of temperature and strain rate on cavitation in a superplastic duplex stainless steel

Pulino-Sagradi, D.; Nazar, Ana Maria Martinez; Ammann, J.J.; Medrano, Ricardo Enrique

doi:10.1016/s1359-6454(97)00134-1

Cited by 17 publications

(8 citation statements)

References 11 publications

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“…7), using the microstructure-based constitutive relations described above Eqs. (1)(2)(3)(4)(5)(6). The new criterion is given by:…”

Section: Void Growth Modelmentioning

confidence: 99%

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Effects of microstructural evolution on the stability of superplastic deformation

Thuramalla

Khraisheh

2003

Computational Fluid and Solid Mechanics 2003

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“…7), using the microstructure-based constitutive relations described above Eqs. (1)(2)(3)(4)(5)(6). The new criterion is given by:…”

Section: Void Growth Modelmentioning

confidence: 99%

“…Analysis of failure during SPF is either based on geometrical considerations [3][4][5][6] or microstructural defects such as cavitation [7][8][9][10]. There are no failure criteria that account for the two failure modes.…”

Section: Introductionmentioning

confidence: 99%

Effects of microstructural evolution on the stability of superplastic deformation

Thuramalla

Khraisheh

2003

Computational Fluid and Solid Mechanics 2003

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“…6 Superplasticity can be linked to grain-boundary sliding, but grain-boundary sliding also causes cavity formation, which in turn causes stress concentration, and if these stresses cannot be released at sufficient rates, the cavities nucleate. 14 The cavities, provided with appropriate conditions, then undergo the processes of growth and coalescence and form larger cavities that can lead to failure. 14 Another factor that negatively influences the mechanical properties is the precipitation of secondary phases, 15 especially the s-phase, which occurs in the temperature range from 700°C to 1000°C and is promoted by Cr, Mo and Si.…”

Section: Introductionmentioning

confidence: 99%

Hot tensile testing of SAF 2205 duplex stainless steel

Tehovnik¹,

Žužek²,

Burja³

2016

Mater. Tehnol.

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The changes to the microstructure of the duplex stainless steel SAF 2205 during hot tensile tests were investigated. The dominant restoration mechanisms for ferrite and austenite were dynamic recovery (DRV) and dynamic recrystallization (DRX), respectively. Also, the effect of temperature on the deleterious phase precipitation was investigated. The specimens were tested with hot tensile deformation tests in the temperature range from 800°C to 1100°C. The tensile strength of the investigated steel decreased rapidly in the temperature range from 800°C to 950°C and slowly at the testing temperatures from 1000°C to 1100°C. It was found that SAF 2205 has excellent hot-working properties at temperatures between 950°C and 1100°C. The differences in the mechanical properties of austenite and ferrite along with the precipitation of the s-phase represent the most important restrictions during hot working. Optical microscopy was used for the microstructure-evolution analysis in the duplex stainless steel during the hot tensile tests. Keywords: duplex stainless steel, hot tensile test, microstructural evolution, intermetallic phases, s-phase Preiskovali smo spremembe mikrostrukture dupleks nerjavnega jekla SAF 2205 med vro~imi nateznimi preskusi. Prevladujo~a mehanizma meh~anja v feritu in avstenitu sta bila dinami~na poprava in/ali dinami~na rekristalizacija. V dupleks nerjavnem jeklu je bil raziskan vpliv temperature na izlo~anje {kodljivih faz. Vzorce smo vro~e natezno presku{ali v temperaturnem obmo~ju med 800°C in 1100°C. Natezna trdnost preiskanega jekla se je hitro zni`ala v temperaturnem obmo~ju med 800°C in 950°C ter po~asneje pri temperaturah preskusov med 1000°C in 1100°C. Ugotovili smo, da ima SAF 2205 odli~ne vro~e preoblikovalne lastnosti v temperaturnem obmo~ju med 950°C in 1100°C. Najve~je omejitve pri preoblikovanju predstavljajo razlike v mehanskih lastnostih med avstenitom in feritom ter izlo~anje s-faze. V raziskavi je bila uporabljena opti~na mikroskopija za analizo razvoja mikrostrukture v dupleks nerjavnem jeklu med vro~imi nateznimi preskusi. Klju~ne besede: dupleks nerjavno jeklo, vro~i natezni preskusi, razvoj mikrostrukture, intermetalne faze, s-faza

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“…The degree of cavitation increases with raising strain-rate or lowering temperature, depending on materials, testing conditions and microstructural stability. 1,2) In a superplastic yttria stabilized tetragonal zirconia polycrystal (Y-TZP), a cavitation behavior quite similar to superplastic metals has also been observed, i.e., cavities grow and coalesce with nearby ones mostly parallel to the tensile axis with the deformation. [3][4][5] Experimental results on Y-TZP have indicated that even small levels of cavitation may affect to the room temperature mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Flat Cavities formed in TZP caused by Superplastic Deformations at High Strain-Rates and Their Effect on Elongation

et al. 2004

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Cavitation in a superplastic 3Y-TZP pulled under different temperature and strain-rate conditions was analyzed by means of SANS techniques. In high strain-rate deformations, the formation of crack-like flat cavities with their flat surfaces lying roughly normal to the tensile axis was found, in addition to conventional cavities slightly elongated along the tensile direction having been frequently observed in superplastically deformed 3Y-TZP. Coalescence of the nearby crack-like flat cavities during the high strain-rate deformations gave rise to the generation of large brittle-like cracks, which led to an earlier fracture without apparent occurrence of necking. A mechanism for the formation of the flat cavities and their effect on the elongation are discussed.

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Effect of temperature and strain rate on cavitation in a superplastic duplex stainless steel

Cited by 17 publications

References 11 publications

Effects of microstructural evolution on the stability of superplastic deformation

Effects of microstructural evolution on the stability of superplastic deformation

Hot tensile testing of SAF 2205 duplex stainless steel

Flat Cavities formed in TZP caused by Superplastic Deformations at High Strain-Rates and Their Effect on Elongation

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