Dynamic strain ageing in Ni-base superalloy 720Li

Gopinath, K.; Gogia, A.K.; Kamat, S.V.; Ramamurty, Upadrasta

doi:10.1016/j.actamat.2008.11.005

Cited by 159 publications

(60 citation statements)

References 52 publications

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“…AISI 316 and 316L austenitic stainless steels show DSA behaviour in the temperature range of 200-800 • C [6][7][8]. However, literature investigation indicated that there are inconclusive works related to DSA behaviour of weld joints of austenitic stainless steels.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Muhamed

Gündüz

Erden

et al. 2017

Metals

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In the current study, dynamic strain ageing (DSA) phenomena in 316L austenitic stainless steel was investigated under as-received and as-welded conditions. A tensile test was carried out on as-received and as-welded samples for the temperatures of 25-800 • C at a strain rate of 1 × 10 −3 s −1 . Microstructure and fracture surfaces were investigated by optic and scanning electron microscopes (SEM). 316L austenitic stainless steel showed different DSA behavior under as-received and as-welded conditions, which are discussed in terms of microstructure and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Muhamed

Gündüz

Erden

et al. 2017

Metals

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“…An increase in ¾ c with increasing deformation temperature is commonly observed in FCC metals such as Al alloys, 29,30) Ni based superalloys, 31,32) and Hadfield steel. 5) Charnock claimed 33) that the inverse relationship is caused by static aging and the deterioration of the atmosphere.…”

Section: Conventional Approach To Dynamic Strain Agingmentioning

confidence: 99%

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel

2012

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The influences of deformation temperature and strain rate on the serrated flow behavior of a Fe17Mn0.3C alloy with a low stacking fault energy were investigated by the tensile tests in a temperature range of 273 to 523 K. Three regions were found when the deformation temperature was plotted against the critical strains for the onset of serrations. The critical strain decreased in the region of 273 to 323 K, increased in that of 323 to 423 K, and decreased again in that of 423 to 523 K with increasing temperature. The first two regions are well known. However, the third region corresponding to that of high temperature has not been reported, and this region could be interpreted by separately considering the interactions of solute atoms with leading and trailing partials. Since the velocity of the leading partials is assumed to be significantly higher than that of the trailing partials, the critical strains in the first and third regions were concluded to result from trapping the trailing partials and the leading partials, respectively.

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“…This is well known to occur in precipitation hardened Ni-base superalloys, and has been correlated to the presence of carbon at intermediate temperatures (< 550 • C) [4][5][6][7][8][9] and solute elements (typically Cr or Mo) at higher temperatures (> 550 • C) [6][7][8][9]. Except for the serrated yielding (Portevin-Le Chatelier effect) DSA typically leads to increased stresses and reduced ductility during monotonic loading [10].…”

Section: Introductionmentioning

confidence: 99%

“…Typical activation energies for DSA in superalloys at intermediate temperatures, where carbon is claimed to be responsible, are in the range 50-130 kJ/mol, see e.g. [4][5][6][7][8][9]. This is usually compared to the activation energy for diffusion of C in Ni (138 kJ/mol for lattice diffusion and 69 kJ/mol for pipe diffusion [18]).…”

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Dynamic strain aging in Haynes 282 superalloy

Hörnqvist

Joseph

Persson

et al. 2014

MATEC Web of Conferences

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Abstract. Haynes 282 is a newly introduced Ni-based superallony, developed to provide a combination of hightemperature mechanical properties, thermal stability and processability. The present contribution investigates the effect of dynamic strain aging (DSA) on the deformation behaviour of Haynes 282 during monotonic and cyclic loading. It is shown that DSA (presumably related to carbon diffusion based on rough estimates of the activation energy) completely dominates the development of the stress during cycling at intermediate temperatures, leading to extensive cyclic hardening and serrated yielding. However, no clear effects on the fatigue life or the resulting dislocation structure could be observed. The tensile properties were not severely affected, in spite of the presence of extensive serrated yielding, although a reduction in ductility was observed in the DSA temperature regime. During monotonic loading at lower strain rates indications of an additional DSA mechanism due to substitutional elements were observed.

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Dynamic strain ageing in Ni-base superalloy 720Li

Cited by 159 publications

References 52 publications

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel

Dynamic strain aging in Haynes 282 superalloy

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Dynamic strain ageing in Ni-base superalloy 720Li

Cited by 159 publications

References 52 publications

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Dynamic Strain Aging Behaviour in AISI 316L Austenitic Stainless Steel under As-Received and As-Welded Conditions

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe&ndash;Mn&ndash;C Austenitic Steel

Dynamic strain aging in Haynes 282 superalloy

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Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel