An Accelerated Method for Creep Prediction From Short Term Stress Relaxation Tests

Guo, Jinquan; Li, Fēi; Zheng, Xiaotao; Shi, Huichao; Meng, Wuzhou

doi:10.1115/1.4032109

Cited by 21 publications

(4 citation statements)

References 18 publications

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“…The standard reference is GB/T2039-2012 and the model RD-50 electronic universal creep testing machine is used to perform constant strain creep test at multiple temperatures. It has been reported [7,8] that the method of deducing and predicting the creep rupture property by the constant strain creep rate converted to the minimum creep rate by the relevant model is a reliable way to evaluate the high temperature performance of metal materials. Through this test, the effects of service on the creep resistance of the HR3C base metal, the T92 base metal and the weld are characterized.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

The Precipitation Behavior and Mechanical Properties of Long Term Serviced HR3C/T92 Dissimilar Joint

Guan

Cao

Cheng

et al. 2019

KEM

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The dissimilar weld joint of HR3C steel and T92 steel is widely used in the ultra supercritical (USC) boiler due to the different service conditions of HR3C steel and T92 steel. It is important to study how serviced influenced the HR3C/T92 dissimilar joint. The HR3C/T92 dissimilar joint had already served 51020 h under 605 °C and 26.25 MPa. The microstructure and mechanical properties of the long term serviced HR3C/T92 dissimilar joint were tested by XRD, SEM, EPMA,TEM, the impact testing machine and the creep and stress rupture testing machine. The XRD results show that the weld is mainly γ-Fe, which is similar to the HR3C base metal, while the T92 base metal is mainly α-Fe. The SEM results indicate that serviced HR3C’s precipitation behavior is complicated, cause multiple precipitated phases precipitated during the service. Chain-liked M23C6precipitated along the grain boundary. M23C6phase cause the chromium depletion zone along the grain boundary. T92 base metal precipitated lots of carbide particles during the service. Those carbide particles are around 1 μm. The impact fracture of HR3C base metal is brittle fracture while the impact fracture of T92 base metal is ductile fracture. Moreover, the impact fracture of weld is mixed fracture. Chain-liked M23C6along the grain boundary is the main cause of the brittleness of serviced HR3C steel.The constant strain creep tests were proceeded under 650 °C, 700 °C and 750 °C. The high-temperature creep resistance of HR3C base metal is better than that of T92 base metal after service. The resistant to high-temperature creep of served joint is similar to that of serviced T92 base metal. With the increase of temperature, the creep resistance of the T92 base metal decreases the most. On the contrary, the creep resistance of the HR3C base metal shows the minimum reduction.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

The Precipitation Behavior and Mechanical Properties of Long Term Serviced HR3C/T92 Dissimilar Joint

Guan

Cao

Cheng

et al. 2019

KEM

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“…Especially, the creep deformation will accelerate the leakage failure of sealing systems at relatively elevated temperature. [27][28][29] Accordingly, it is necessary to study the ratcheting effect of composite materials under repeated compression taking into consideration of various important influence factors.…”

Section: And Stressmentioning

confidence: 99%

Compressive ratcheting and creep of non-asbestos fibre composite considering temperature effect

Zheng

Dai

et al. 2018

Journal of Composite Materials

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Compressive ratcheting response and creep of non-asbestos fibre composite are tested based on a designed compression–compression clamp for plate-shape specimens. The influences of temperature, stress amplitude and stress rate are discussed in detail. A two-stage constitutive model is developed to describe the compression-resilience relationship of non-asbestos fibre composite. Results present that a crescent-shaped stress–strain relationship of non-asbestos fibre composite is observed under repeated compression, and the proposed two-stage constitutive model can predict the compression-resilience curve for the first cycle very well under various temperatures and stress rates. Additionally, the ratcheting strain of non-asbestos fibre composite obviously enhances with increasing the temperature. However, it has a little change when the stress rate and stress amplitude are varied based on the experimental data. The ratcheting strain rate per cycle reduces promptly during about the first 75 cycles, and it is always less than 1 × 10−4 per cycle during the subsequent cycles and tends to shakedown. Moreover, the ratcheting strain with small stress amplitude is very close to the creep deformation at the same testing time and peak stress under different temperatures. This indicates that the ratcheting strain of non-asbestos fibre composite under fatigue loads with small stress amplitude can be evaluated equivalently by the corresponding creep deformation with high precision.

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“…Lee et al developed a gasket‐integrated carbon/silicone elastomer composite bipolar plate to enhance the sealing reliability of proton exchange membrane fuel cell system. Under high‐temperature condition, creep and stress relaxation of gaskets and bolts have significant effect on the sealing joints . However, according to the best knowledge of authors, investigations on accumulated compressive deformation features of RGSWSSI are still very few, especially at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Ratcheting effect of reinforced graphite sheet with stainless steel insert (RGSWSSI) under cyclic compression at elevated temperature

Zheng

Dai

Chen

et al. 2018

Fatigue Fract Eng Mat Struct

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Ratcheting and creep of reinforced graphite sheet with stainless steel insert (RGSWSSI) are tested under cyclic stress‐controlled compression by a self‐designed clamp from 500°C to 600°C. The effects of insert type, temperature, stress amplitude, stress rate, creep, and loading sequence are considered. Results present that ratcheting deformations for RGSWSSI with 316‐L stainless steel tanged and bonded insert approach to each other and show little rate dependence, while they slightly increase with the increment of stress amplitude and temperature. Moreover, obvious ratcheting effect takes place under cyclic pulsating loads with the peak stress of 32 MPa at 500°C or higher. The accumulated deformations of RGSWSSI under small stress amplitude only increase during about the first 25 cycles and then always turn to shakedown. It can also be estimated by the corresponding static creep strain in practical engineering with good accuracy at high temperature. This work provides important data and understanding of RGSWSSI under harsh fluctuating loads.

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An Accelerated Method for Creep Prediction From Short Term Stress Relaxation Tests

Cited by 21 publications

References 18 publications

The Precipitation Behavior and Mechanical Properties of Long Term Serviced HR3C/T92 Dissimilar Joint

The Precipitation Behavior and Mechanical Properties of Long Term Serviced HR3C/T92 Dissimilar Joint

Compressive ratcheting and creep of non-asbestos fibre composite considering temperature effect

Ratcheting effect of reinforced graphite sheet with stainless steel insert (RGSWSSI) under cyclic compression at elevated temperature

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