The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Wenming Tang - One of the best experts on this subject based on the ideXlab platform.
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high temperature short term tensile test and Creep Rupture Strength prediction of the t92 tp347h dissimilar steel weld joints
Engineering Failure Analysis, 2012Co-Authors: Guohong Chen, Youming Song, Jiaqing Wang, Xinhai Yu, Tao Zhang, Jianhua Zhang, Wenming TangAbstract:Abstract After short-term tensile test at 848–923 K, microstructures, fractographies and fractural mechanisms of the T92/TP347H dissimilar steel weld joints were studied. An equation of the Creep Rupture Strength related to the short-term tensile Strength of the joints was firstly derived based on the Goldenberg model [1] . In the high-temperature tensile process, the fracture location of the joints is all in the T92 side fine grained heat affected zone (FGHAZ); however, the fracture mechanism of the joints is changed from a mixed mode (normal plus shear) to a shear mode as the testing temperature risen, which was explained in terms of the stress tri-axiality theory. Moreover, an equation of the Creep Rupture Strength of the weld joints was derived, and then the Creep Rupture Strength of the joints was doped out, σ 10 5 873 = 49.0 MPa . It indicates that the joints have a high reliability when used in the USC power units.
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High-temperature short-term tensile test and Creep Rupture Strength prediction of the T92/TP347H dissimilar steel weld joints
Engineering Failure Analysis, 2012Co-Authors: Guohong Chen, J. Hua, Youming Song, Jiaqing Wang, Tao Zhang, Jianhua Zhang, Junjian Liu, Xiaolong Bai, Wenming TangAbstract:Abstract After short-term tensile test at 848–923 K, microstructures, fractographies and fractural mechanisms of the T92/TP347H dissimilar steel weld joints were studied. An equation of the Creep Rupture Strength related to the short-term tensile Strength of the joints was firstly derived based on the Goldenberg model [1] . In the high-temperature tensile process, the fracture location of the joints is all in the T92 side fine grained heat affected zone (FGHAZ); however, the fracture mechanism of the joints is changed from a mixed mode (normal plus shear) to a shear mode as the testing temperature risen, which was explained in terms of the stress tri-axiality theory. Moreover, an equation of the Creep Rupture Strength of the weld joints was derived, and then the Creep Rupture Strength of the joints was doped out, σ 10 5 873 = 49.0 MPa . It indicates that the joints have a high reliability when used in the USC power units.
W. M. Tang - One of the best experts on this subject based on the ideXlab platform.
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High temperature tensile test and Creep Rupture Strength prediction of T92/Super304H dissimilar steel weld joints
Materials at High Temperatures, 2014Co-Authors: X. L. Bai, Q. Zhang, G. H. Chen, J. Q. Wang, Jianjun Liu, J. Hua, J. H. Zhang, W. M. TangAbstract:After short term tensile test at 823–923 K, microstructure, fractography and fracture mechanism of the T92/Super304H dissimilar steel weld joints were studied. In the high temperature tensile process, the fracture location of all joints is in the T92 base metal; however, the fracture mechanism of these joints changes from a normal mode to a shear mode with the increase of the temperature. Moreover, an equation of the Creep Rupture Strength related to the short term tensile Strength of the joints was firstly derived in terms of the Goldenberg model. And then the Creep Rupture Strength of the joints was obtained, = 42·7 MPa.
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high temperature tensile test and Creep Rupture Strength prediction of t92 super304h dissimilar steel weld joints
Materials at High Temperatures, 2014Co-Authors: X. L. Bai, Q. Zhang, G. H. Chen, J. Q. Wang, Jianjun Liu, J. Hua, J. H. Zhang, W. M. TangAbstract:After short term tensile test at 823–923 K, microstructure, fractography and fracture mechanism of the T92/Super304H dissimilar steel weld joints were studied. In the high temperature tensile process, the fracture location of all joints is in the T92 base metal; however, the fracture mechanism of these joints changes from a normal mode to a shear mode with the increase of the temperature. Moreover, an equation of the Creep Rupture Strength related to the short term tensile Strength of the joints was firstly derived in terms of the Goldenberg model. And then the Creep Rupture Strength of the joints was obtained, = 42·7 MPa.
Z.d. Xiang - One of the best experts on this subject based on the ideXlab platform.
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long term Creep Rupture Strength prediction for a new grade of 9cr martensitic Creep resistant steel g115 an application of a new tensile Creep Rupture model
Journal of materials research and technology, 2020Co-Authors: C C Jiang, X.l. Song, Z Dong, J Jia, Z.d. XiangAbstract:Abstract A method is presented to firstly rationalise the short-term Creep Rupture Strength data and then to predict the 100,000 h Creep Rupture Strengths of a new 9Cr grade of martensitic Creep resistant steels (G115) at different temperatures. The method is made possible by a new tensile Creep Rupture model, which is formulated by combining a new tensile Creep model that integrates tensile Strength at Creep temperature with the Monkman–Grant relationship. On the basis of this new tensile Creep Rupture model, the activation energy of Creep Rupture determined for the steel G115, which is 293 ± 25 kJ/mol, does not depend on stress or stress range, and the Creep Rupture stress exponent depends only on stress range but not on temperature. The model parameters determined from short-term Creep Rupture Strength data can then be used to predict the long-term Creep Rupture Strengths at different temperatures for this new steel grade. The reliability of the predictions is analysed and the microstructural evolutions occurring during Creep that may cause premature Creep Rupture and hence lead to possible over-predictions are also delineated. Based on the prediction results obtained, the highest applicable temperature of this new steel grade for power plant applications is determined to be slightly higher than 625 °C.
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effects of heterogeneous and homogenous laves phase precipitation on Creep Rupture Strength of fe 9cr 3co wt alloys at 650 c
Advanced Materials Research, 2014Co-Authors: S. Zhu, M. Yang, X.l. Song, S. Tang, Zhan Zhang, Z.d. XiangAbstract:The relationship between Creep Rupture Strength and Laves phase precipitation and growth kinetics was investigated at 650 °C for two Fe-9Cr-3Co (wt.%) alloys differing mainly in the amounts of W and Mo added. In the alloy with 3.14 wt.% W added, Laves phase precipitated heterogeneously on grain boundaries and hence had little dispersion Strengthening effect. Its stress exponent for rup-ture time became lower in the lower Creep stress range tested. In the alloy with 1.31 wt.% W and 3.22 Mo added, Laves phase precipitated both heterogeneously on grain boundaries and homogenously within grains and there was no reduction in stress exponent for Rupture time in the whole stress range tested. The Lave phase precipitation kinetics increased with increasing the total amount of W and Mo in the alloys. The differences in stress-Rupture time relationship observed between the two alloys were discussed in relation to their differences in the Lave phase precipitation behaviour.
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Characterisation of Laves phase precipitation and its correlation to Creep Rupture Strength of ferritic steels
Materials Characterization, 2014Co-Authors: S. Zhu, M. Yang, X.l. Song, S. Tang, Z.d. XiangAbstract:Abstract The Laves phase precipitation process was characterised by means of field emission scanning electron microscopy to demonstrate its effect on Creep Rupture Strength of steels with a fully ferritic matrix. To eliminate the effects of carbide and carbonitride precipitations so that the Creep Rupture data can be analysed exclusively in relation to the Laves phase precipitation process, an alloy Fe–9Cr–3Co–3W (wt.%) without C and N additions was used for the study. Creep Rupture Strengths were measured and volume fraction and particle size of Laves phase precipitates in the Ruptured specimens were analysed. It was found that the Creep Rupture Strength started to collapse (or decrease more rapidly) long before the Laves phase precipitation reached equilibrium fraction. This was related to the onset of the coarsening of Laves phase particles, which precipitated only on grain boundaries and hence contributed little to precipitation Strengthening. Creep deformation had no effect either on the precipitation kinetics or on the growth kinetics of Laves phase particles.
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A few observations on Laves phase precipitation in relation to its effects on Creep Rupture Strength of ferritic steels based on Fe–9Cr (wt%) alloys at 650 °C
Materials Science and Engineering: A, 2014Co-Authors: S. Zhu, M. Yang, X.l. Song, S. Tang, Zhan Zhang, L.b. Wang, Z.d. XiangAbstract:Abstract Creep Rupture Strengths, Laves phase precipitation and growth kinetics were measured at 650 °C for three Fe–9Cr (wt%) alloys in which the concentrations of Co, W and Mo were varied to investigate their effects on Creep Rupture Strength and Laves phase precipitation behaviour, but C and N were not added to avoid the precipitation of carbide and carbonitride phases so that the effects of Laves phase precipitation on Creep Rupture Strengths can be exclusively identified. In the two alloys containing about 3 wt% W, Laves phase was found to precipitate only on grain boundaries and hence contributed little to precipitation Strengthening. A reduction in stress exponent for Rupture time occurred long before the Laves phase precipitation was completed in these two alloys, which was attributed to the coarsening of Laves phase particles at grain boundaries. In an alloy with 4.53 wt% W+Mo added, Laves phase precipitated both at grain boundaries and within grains with a precipitation free zone present on both sides of grain boundary. The Creep Rupture Strength of this alloy was higher than the other two alloys, which was considered to be mainly due to the solution Strengthening effect of combined addition of W and Mo. Its stress exponent for Rupture time did not change in the whole stress range tested, which was attributed to the fast growth kinetics of Laves phase particles precipitated on grain boundaries. Co had no solid solution Strengthening effect, but it can increase the Laves phase precipitation kinetics in the alloys, which can also be increased by increasing the concentration of W+Mo.
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Effects of Heterogeneous and Homogenous Laves Phase Precipitation on Creep Rupture Strength of Fe-9Cr-3Co (wt.%) Alloys at 650 °C
Advanced Materials Research, 2014Co-Authors: S. Zhu, M. Yang, X.l. Song, S. Tang, Zhan Zhang, Z.d. XiangAbstract:The relationship between Creep Rupture Strength and Laves phase precipitation and growth kinetics was investigated at 650 °C for two Fe-9Cr-3Co (wt.%) alloys differing mainly in the amounts of W and Mo added. In the alloy with 3.14 wt.% W added, Laves phase precipitated heterogeneously on grain boundaries and hence had little dispersion Strengthening effect. Its stress exponent for rup-ture time became lower in the lower Creep stress range tested. In the alloy with 1.31 wt.% W and 3.22 Mo added, Laves phase precipitated both heterogeneously on grain boundaries and homogenously within grains and there was no reduction in stress exponent for Rupture time in the whole stress range tested. The Lave phase precipitation kinetics increased with increasing the total amount of W and Mo in the alloys. The differences in stress-Rupture time relationship observed between the two alloys were discussed in relation to their differences in the Lave phase precipitation behaviour.
Marko Nagode - One of the best experts on this subject based on the ideXlab platform.
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a method for long term Creep Rupture Strength prediction based on a small sample of experimental results smoothed bootstrapping and time temperature parameters
Materials & Design, 2015Co-Authors: Domen Šeruga, Marko NagodeAbstract:Abstract A method is presented that enables predictions of long-term Creep–Rupture Strength based on a small sample of short-term experimental results. Smoothed bootstrapping in combination with the most commonly used time–temperature parameters is used for the determination of the optimal values of coefficients. For ten metals, Creep–Rupture Strengths are evaluated for both full-size and sub-size data sets. Predictions in the case of small data sets always lie on the conservative side, whereas the confidence interval of predicted Strengths decreases with an increasing number of experimental results. However it is shown here that for the evaluated materials, usable interim predictions of Creep–Rupture Strengths can be achieved.
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A method for long-term Creep–Rupture Strength prediction based on a small sample of experimental results, smoothed bootstrapping and time–temperature parameters
Materials & Design, 2015Co-Authors: Domen Šeruga, Marko NagodeAbstract:Abstract A method is presented that enables predictions of long-term Creep–Rupture Strength based on a small sample of short-term experimental results. Smoothed bootstrapping in combination with the most commonly used time–temperature parameters is used for the determination of the optimal values of coefficients. For ten metals, Creep–Rupture Strengths are evaluated for both full-size and sub-size data sets. Predictions in the case of small data sets always lie on the conservative side, whereas the confidence interval of predicted Strengths decreases with an increasing number of experimental results. However it is shown here that for the evaluated materials, usable interim predictions of Creep–Rupture Strengths can be achieved.
J. Hua - One of the best experts on this subject based on the ideXlab platform.
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High temperature tensile test and Creep Rupture Strength prediction of T92/Super304H dissimilar steel weld joints
Materials at High Temperatures, 2014Co-Authors: X. L. Bai, Q. Zhang, G. H. Chen, J. Q. Wang, Jianjun Liu, J. Hua, J. H. Zhang, W. M. TangAbstract:After short term tensile test at 823–923 K, microstructure, fractography and fracture mechanism of the T92/Super304H dissimilar steel weld joints were studied. In the high temperature tensile process, the fracture location of all joints is in the T92 base metal; however, the fracture mechanism of these joints changes from a normal mode to a shear mode with the increase of the temperature. Moreover, an equation of the Creep Rupture Strength related to the short term tensile Strength of the joints was firstly derived in terms of the Goldenberg model. And then the Creep Rupture Strength of the joints was obtained, = 42·7 MPa.
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high temperature tensile test and Creep Rupture Strength prediction of t92 super304h dissimilar steel weld joints
Materials at High Temperatures, 2014Co-Authors: X. L. Bai, Q. Zhang, G. H. Chen, J. Q. Wang, Jianjun Liu, J. Hua, J. H. Zhang, W. M. TangAbstract:After short term tensile test at 823–923 K, microstructure, fractography and fracture mechanism of the T92/Super304H dissimilar steel weld joints were studied. In the high temperature tensile process, the fracture location of all joints is in the T92 base metal; however, the fracture mechanism of these joints changes from a normal mode to a shear mode with the increase of the temperature. Moreover, an equation of the Creep Rupture Strength related to the short term tensile Strength of the joints was firstly derived in terms of the Goldenberg model. And then the Creep Rupture Strength of the joints was obtained, = 42·7 MPa.
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High-temperature short-term tensile test and Creep Rupture Strength prediction of the T92/TP347H dissimilar steel weld joints
Engineering Failure Analysis, 2012Co-Authors: Guohong Chen, J. Hua, Youming Song, Jiaqing Wang, Tao Zhang, Jianhua Zhang, Junjian Liu, Xiaolong Bai, Wenming TangAbstract:Abstract After short-term tensile test at 848–923 K, microstructures, fractographies and fractural mechanisms of the T92/TP347H dissimilar steel weld joints were studied. An equation of the Creep Rupture Strength related to the short-term tensile Strength of the joints was firstly derived based on the Goldenberg model [1] . In the high-temperature tensile process, the fracture location of the joints is all in the T92 side fine grained heat affected zone (FGHAZ); however, the fracture mechanism of the joints is changed from a mixed mode (normal plus shear) to a shear mode as the testing temperature risen, which was explained in terms of the stress tri-axiality theory. Moreover, an equation of the Creep Rupture Strength of the weld joints was derived, and then the Creep Rupture Strength of the joints was doped out, σ 10 5 873 = 49.0 MPa . It indicates that the joints have a high reliability when used in the USC power units.