Effect of environment on crack growth behavior in austenitic stainless steels under creep and fatigue conditions

Sadananda, K.; Shahinian, P.

doi:10.1007/bf02660631

Cited by 52 publications

(14 citation statements)

References 18 publications

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“…This observation validates the explanations [14,15] that the environmental effect is negligible compared to strain aging and dislocation motion at high temperatures (i.e., in ranges from 300°C to 800°C) for 316L austenitic stainless steel, especially for the frequency of pulsed laser (1Hz in FLASH tests) that leads to environmental interactions barely able to develop. Besides, FLASH results show higher number of cycles to initiation compared with uniaxial isothermal fatigue tests under the same strain range (0.5%).…”

Section: Fatigue Analysis and Comparison With Results From Uniaxial Isupporting

confidence: 89%

High cycle thermal fatigue of austenitic stainless steel

et al. 2018

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Abstract.A new experimental setup called FLASH (THErmal Fatigue by LASer or Helium pulses) has been developed to perform thermal fatigue tests on materials used in structures of Sodium-cooled Fast Reactors (SFRs). A set of thermal loadings ranging from 150°C to 200°C prescribed by a high energy laser has been applied to A316L(N) stainless steel samples. Thermal fatigue tests are performed until a macrocrack is formed. The 3D displacement fields of the surface impacted by the laser beam are measured by a hybrid multiview system. A thermomechanical model is used to compute displacement fields that are compared with correlation measurements. These results are compared in terms of strain levels to the fatigue curve determined from standardized isothermal uniaxial mechanical fatigue tests.

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Section: Fatigue Analysis and Comparison With Results From Uniaxial Isupporting

confidence: 89%

High cycle thermal fatigue of austenitic stainless steel

et al. 2018

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“…5(b)). Unlike the generally observed FCG behavior at high temperatures, 22) the increase of FCGR with decreasing frequency at 673 K occurred at the region of higher frequencies instead at lower frequencies. Note that no frequency effect was observed at 673 K for frequencies less than 0.2 Hz in each given heat-treated condition.…”

Section: Methodscontrasting

confidence: 74%

Influence of Frequency on the High-Temperature Fatigue Crack Growth Behavior of 17-4 PH Stainless Steels

Hsu

Lin

2007

Mater. Trans.

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The influence of frequency on fatigue crack growth (FCG) behavior was investigated for three differently heat-treated 17-4 PH stainless steels, namely unaged ''Condition A,'' peak-aged ''Condition H900,'' and overaged ''Condition H1150,'' at 673 and 773 K, and at frequencies ranging from 0.002 to 20 Hz. At 773 K, all heat-treated conditions exhibited similar FCG behavior in which no frequency effect was observed at frequencies higher than 2 Hz and the fatigue crack growth rates (FCGRs) increased with decreasing frequency below 2 Hz. The increase in FCGR at a lower frequency at 773 K was thought to be caused by a time-dependent, oxidation-assisted cracking mechanism. At 673 K, for a given heat-treated condition, the FCGRs increased with decreasing frequency at higher frequencies and leveled off at lower frequencies. Such an anomalous FCG behavior was attributable to a dynamic strain aging (DSA) effect. At a given frequency, when the temperature was increased from 673 to 773 K, the FCGR increased in Condition H1150, but decreased in Conditions A and H900 due to an in-situ overaging and precipitate-coarsening effect during the FCG test for the latter.

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“…The IG creep cracks, as shown in Figure 8, most likely propagate by nucleation and growth due to formation and growth of vacancy clusters at the grain boundary crack tips, as proposed by several researchers. [48][49][50][51][52][53][54][55][56] These results suggest that GB creep and GB sliding occur as a fi rst step of IGSCC growth when the fresh intergranular surface is created. The measured IG creep crack growth rates are compared with IGSCC growth rates in PWR water in Figure 9.…”

Section: Role Of Grain Boundary Creep On Intergranular Stress Corrosimentioning

confidence: 98%

Cold Work and Temperature Dependence of Stress Corrosion Crack Growth of Austenitic Stainless Steels in Hydrogenated and Oxygenated High-Temperature Water

Arioka¹,

Yamada²,

Terachi³

et al. 2007

CORROSION

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The rate of stress corrosion cracking (SCC) was measured for nonsensitized, cold-worked Type 316 (UNS S31600) and Type 304 (UNS S30400) in both hydrogenated pressurized water reactor (PWR) primary water and oxygenated water, each containing standard boron and lithium additions. First, the stress dependence of 5% to 20% cold-worked Type 316 (CW316) was determined in the PWR primary environment at 320°C. The rate of crack growth increased both with increasing cold work and stress intensity. Intergranular morphology was observed for 5%, 10%, 15%, and 20% CW316. Second, the dependence of crack growth rates on temperature in the range from 250°C to 320°C were measured in both hydrogenated PWR primary and oxygenated water. More rapid crack growth rates were observed in oxygenated water than that in hydrogenated PWR water. The crack growth rates could be correlated with a 1/T dependence on temperature for both hydrogenated PWR primary and oxygenated water; apparent activation energies of crack growth were similar in both environments. To assess what appeared to be common dependencies on temperature and cold work in both hydrogenated and oxygenated water, grain boundary creep (GB creep) was studied in air using CW316; intergranular creep cracking (IG creep cracking) was observed after low-temperature creep tests in air. The apparent activation energy of IG creep cracking was similar to that of intergranular stress corrosion cracking (IGSCC) in high-temperature water. The similar dependencies on temperature, cold work, and rolling direction of SCC and creep suggest that creep by grain boundary diffusion plays a critical role in the growth of SCC. The extent to which grain boundary diffusion interacts with other electrochemical processes is probably important but is not defi ned.

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Effect of environment on crack growth behavior in austenitic stainless steels under creep and fatigue conditions

Cited by 52 publications

References 18 publications

High cycle thermal fatigue of austenitic stainless steel

High cycle thermal fatigue of austenitic stainless steel

Influence of Frequency on the High-Temperature Fatigue Crack Growth Behavior of 17-4 PH Stainless Steels

Cold Work and Temperature Dependence of Stress Corrosion Crack Growth of Austenitic Stainless Steels in Hydrogenated and Oxygenated High-Temperature Water

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