Effect of strain rate on the high-temperature low-cycle fatigue properties of a nimonic PE-16 superalloy

Valsan, M.; Sastry, D. H.; Rao, K. Bhanu Sankara; Mannan, S.L.

doi:10.1007/bf02646684

Cited by 95 publications

(19 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also agreed upon that the onset and magnitude of the serrations are dependent on strain rate [16,18] and the magnitude of plastic strain [8]. Several authors have reported DSA to have a deleterious effect on the LCF life of stainless steels [3,18 -20] and nickel alloys [5,7,17,20]. The decreased cycle life observed with decreasing strain rate in 316 stainless steel has been attributed to DSA in temperature regimes which there is limited creep and oxidation influence [21].…”

Section: Introductionmentioning

confidence: 79%

See 1 more Smart Citation

The influence of dynamic strain aging on fatigue and creep-fatigue characterization of nickel-base solid solution strengthened alloys

Carroll

Lloyd²,

Simpson³

et al. 2010

Materials at High Temperatures

View full text Add to dashboard Cite

The nickel-base solid solution alloys, Alloy 617 and Alloy 230, have been observed to exhibit serrated yielding or dynamic strain aging (DSA) in a temperatureystrain rate regime of interest for intermediate heat exchangers (IHX) of high temperature nuclear reactors. At 800 C, these nickel-base alloys are prone to large serrated yielding events at relatively low strains. The presence of DSA introduces challenges in characterizing the creep-fatigue and low cycle fatigue behaviour. These challenges include inability to control the target strains as a result of DSA induced strain excursions and distorted hysteresis loops. Methods to eliminate or reduce the influence of DSA on creep-fatigue testing have been investigated, including varying the strain rate, stepping to the target strain, and adjusting servo-hydraulic tuning parameters. It has not been possible to eliminate the impact of serrated flow in the temperature range of interest for these alloys without compromising the desired test protocols.

show abstract

Section: Introductionmentioning

confidence: 79%

“…The cyclic response of an alloy is influenced by DSA through the strain hardening behaviour [12,17,18], the strain rate sensitivity [5,7,18], and the plastic strain component. It is also agreed upon that the onset and magnitude of the serrations are dependent on strain rate [16,18] and the magnitude of plastic strain [8].…”

Section: Introductionmentioning

confidence: 99%

The influence of dynamic strain aging on fatigue and creep-fatigue characterization of nickel-base solid solution strengthened alloys

Carroll

Lloyd²,

Simpson³

et al. 2010

Materials at High Temperatures

View full text Add to dashboard Cite

show abstract

“…7). Thus, the reduction in fatigue life is probably due to DSA, which has been considered to enhance the crack initiation and propagation [5,14,[42][43][44]. Higher stress response developed during cyclic deformation in DSA regime can lead to a larger stress concentration at the crack tip, which would account for the increased crack growth rate and hence a reduced number of cycles in the crack propagation stage.…”

Section: Discussionmentioning

confidence: 99%

Role of dynamic strain aging in the tensile property, cyclic deformation and fatigue behavior of Z2CND18.12N stainless steel between 293 K and 723 K

Wang

Chen

et al. 2012

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…Presumably, dislocation velocities inside the slip bands are too high for dynamic ageing of mobile dislocations to take place and consequently DSA enhances the partitioning of cyclic strains into separate regions marked by high and low amplitudes of dislocation movement (Wilson & Tromans 1970 DSA during LCF has been found to localize deformation. Figure 17 shows the variation of slip band spacing 'i' with strain rate in PE-16 alloy (Valsan et al 1994). The increase in 'i' at lower strain rates and higher temperatures is attributed to enhanced DSA effects.…”

Section: Effect Of Dsa On Lcfmentioning

confidence: 99%

High temperature low cycle fatigue

Rodríguez

Mannan

1995

Sadhana

View full text Add to dashboard Cite

Fatigue at high temperature is a complex phenomenon as it is influenced by a number of time-dependent processes which become important at elevated temperatures. These processes include creep, oxidation, phase instabilities and dynamic strain ageing (DSA), acting either independently or synergistically influence fatigue behaviour, often lowering the fatigue life. Current design approaches employ linear summation of fatigue and creep damage with suitable factors on permissible damage to take care of uncertainties in interaction between cyclic and time-dependent processes. It is, therefore, important to develop a deeper understanding of the processes that occur during high temperature fatigue so that realistic life predictions could be made. Results on the high temperature fatigue behaviour of austenitic stainless steels, ferritic steels and nickel base alloys are presented here. The important mechanisms of interaction of high temperature time-dependent processes with fatigue under various conditions are discussed in detail. Emphasis is placed on cyclic stress response, fatigue life, deformation substructure and fract~'re behaviour. This is followed by a review of important life prediction techniques under combined creep-fatigue loading conditions. Life prediction techniques considered here include linear damage summation, strain range partitioning, ductility exhaustion approach, frequency modified and frequency separation methods, techniques based on hysteresis energy and damage rate models, and methods based on crack-cavitation interation models.

show abstract

Effect of strain rate on the high-temperature low-cycle fatigue properties of a nimonic PE-16 superalloy

Cited by 95 publications

References 28 publications

The influence of dynamic strain aging on fatigue and creep-fatigue characterization of nickel-base solid solution strengthened alloys

The influence of dynamic strain aging on fatigue and creep-fatigue characterization of nickel-base solid solution strengthened alloys

Role of dynamic strain aging in the tensile property, cyclic deformation and fatigue behavior of Z2CND18.12N stainless steel between 293 K and 723 K

High temperature low cycle fatigue

Contact Info

Product

Resources

About