Multiaxial Creep Deformation and Influence of Different Precipitates on Creep Cavitation Failure of 304HCu SS

Sahoo, K.C.; Laha, K.

doi:10.1007/s11665-022-07103-w

Cited by 2 publications

(4 citation statements)

References 57 publications

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“…The analysis was carried out using four nodded quadrilateral elements and incorporating the elastic-creep behaviour of the material in ABAQUS-6.16 FE solver. The values of elastic modulus (E) of 134 GPa and Poisson's ratio of 0.3 were chosen for the elastic deformation of the material [11]. A meshed model picture of 1/12th part of notch geometry at the notched area has been shown in figure 3.…”

Section: Fe-analysismentioning

confidence: 99%

“…In the previous manuscript, in-house FE-simulation studies on the influence of different precipitates, on creep cavitation behavior of 304HCu SS were already done with the help of strain distribution through critical strain approach and the prediction of minimum strain required to nucleate creep cavity was done at different temperatures for Cr 23 C 6 and NbC precipitates [11].…”

Section: Effect Of Notch Angle On Fracture Appearancementioning

confidence: 99%

“…It has been observed that 304HCu SS shows notch strengthening effect with increase in notch sharpness for relatively shorter duration however, at relatively longer duration for relatively sharper notches, 304HCu SS exhibited tendency towards notch weakening. At longer duration, the decrease in creep rupture life of sharper notch specimen is mainly due to the acceleration of nucleation and growth process of intergranular creep cavities and it is quite evident in precipitation hardened material like 304HCu SS where precipitate coarsening and formation of new precipitates plays an important role for nucleation of creep cavity exposed to longer duration [11]. Further, the creep cavitation induced damage mechanism is dependent on material deformation characteristics, testing temperature and applied stress level.…”

Section: Introductionmentioning

confidence: 99%

“…Nix [14] et al has developed the concept of principal facet stress in governing multiaxial rupture life and is defined by the numerical formulation of maximum, intermediate and minimum principal stress. Sahoo et al have proposed two unique mathematical models to predict the creep rupture life and ductility of the material for relatively longer period of time testtemperature [10,11]. Majzoobi et al [15] conducted a series of tensile experiments for different stress triaxialities and investigated the non linear ductile damage of Al 2024 using continuum damage mechanics model proposed by Bonora [16].…”

Section: Introductionmentioning

confidence: 99%

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Effect of notch angle on creep deformation and rupture behavior of 304HCu SS

Sahoo,

Sreevidya,

Sakthivel

et al. 2024

Eng. Res. Express

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Multiaxial creep deformation behaviour of U-notched 304HCu austenitic stainless steel (304HCu SS) has been studied by altering the angle of the U-notch, by 300, 600, 900, and 1200, for a fixed root radius of 1.25 mm. The associated stress concentration factor for the U-notch geometry is about 1.8-1.86 with decrease in notch angle. Creep rupture lives of all notched specimens are above the un-notched specimen. However, decrease in rupture life and increase in creep rupture ductility has been observed with an increase in notch angle. At all notch angles, nearly intergranular creep cavitation failure with isolated cavities was observed at the notch center. In contrast, at the notch root, with decrease in notch angle the fracture mode changed from mixed mode to intergranular fracture. Finite element analysis (FEA) of stationary state of stress distribution indicated that von-Mises stress throughout the notch throat plane and maximum principal stress near the notch root region were found to increase with increase in notch angle. However, away from the notch root the maximum principal stress was found to decrease with increase in notch angle. Hydrostatic stress distribution remained same near the notch root at all the notch angles, but tends to increase towards the specimen center with decrease in notch angle. Similarly, at the notch throat plane, triaxiality factor (TF) was found to increase with decrease in notch angle. The creep damage evaluated through FEA coupled with continuum damage mechanics (CDM) proposed by Kachanov-Rabotov (K-R) model was found to increase with an increase in notch angle, resulting in decrease in creep rupture life. Creep damage evaluated as a function of notch depth, during initial creep exposure, revealed significant damage for 1.675 mm notch depth in comparison to 2 and 2.5 mm notch depths which resulted in lower rupture life for 1.675 mm notch depth.

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Section: Fe-analysismentioning

confidence: 99%

Section: Effect Of Notch Angle On Fracture Appearancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of notch angle on creep deformation and rupture behavior of 304HCu SS

Sahoo,

Sreevidya,

Sakthivel

et al. 2024

Eng. Res. Express

Self Cite

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Study on Creep Behaviors of GH3230 Superalloy With Side Notches or a Center Inclined Hole at 900°C and 1000°C

Xu,

Hou,

Ren

et al. 2024

Fatigue Fract Eng Mat Struct

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GH3230 superalloy is one of the most promising materials for aviation engine hot components, characterized by lots of holes and prone to creep failure. To study the effect of the side notches or center inclined hole on creep behaviors of GH3230 superalloy, a series of creep experiments and numerical simulations based on Sinh creep‐damage constitutive model were conducted at 900°C and 1000°C. The influence mechanism of notch strengthening on creep life was analyzed under different notch sizes. The results show that the opposite combination of stress triaxiality and multiaxial stress caused by notches determines the creep damage and life. With the increase of the stress concentration factor, the notch strengthening factor demonstrates a trend of first increasing and then decreasing, whereas the increase in net stress is accompanied by the augmentation of notch strengthening factor under the same stress concentration factor.

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Multiaxial Creep Deformation and Influence of Different Precipitates on Creep Cavitation Failure of 304HCu SS

Cited by 2 publications

References 57 publications

Effect of notch angle on creep deformation and rupture behavior of 304HCu SS

Effect of notch angle on creep deformation and rupture behavior of 304HCu SS

Study on Creep Behaviors of GH3230 Superalloy With Side Notches or a Center Inclined Hole at 900°C and 1000°C

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