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By D Gandy; J Shingledecker; Ramaswamy Viswanathan; Electric Power Research Institute.; et al

ISBN-10: 1615037241

ISBN-13: 9781615037247

ISBN-10: 1615038981

ISBN-13: 9781615038985

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Read Online or Download Advances in materials technology for fossil power plants : proceedings from the sixth International Conference, August 31-September 3, 2010, Santa Fe, New Mexico, USA PDF

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Extra info for Advances in materials technology for fossil power plants : proceedings from the sixth International Conference, August 31-September 3, 2010, Santa Fe, New Mexico, USA

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Huntington) worked together on a joint project for the modification of INCONEL 740. Four modified experimental heats were melted and their chemical compositions are listed in Table 9. 5 Bal Fig. 24 a and b shows SEM images of modified alloys Heat 1 and Heat 2 aged at 750°C for 5,018h respectively. The strengthening phase γ′ has been discerned clearly and a small amount of carbides was also found in the grains and at grain boundaries. In comparison with the previous results of INCONEL 740 (see Fig.

From this it can be seen that the developed steel is likely to achieve 100,000h creep strength of 100MPa at the target temperature of 700°C. Fig. 9 Creep rate - time curves for developed 18Cr-30Ni-3Nb austenitic steel with and without boron. 10 Creep rupture strength of developed 18Cr-30Ni-3Nb austenitic steel in comparison with TP347H and Inco740 20 Development of Ni-based Alloys for Use up to 750°C. With Ni-based super alloys, in applications such as gas turbine blades, it is not difficult to maintain creep strength even at high temperatures, due to precipitation hardening of the γ' phase.

This shows that creep rupture life is maximized and the creep rate is minimized with a nitrogen addition of around 80ppm. From this, it can be surmised that creep rupture life will be maximized with higher nitrogen content so long as this is within the boron-nitrogen compositional range where BN does not form during normalizing. In welded joints, since it is essential that soluble boron remains after normalizing in order to limit Type IV failure, it can thus be stated as an alloy design guideline for 650°C ferritic steels that the content of nitrogen be raised (within the boron-nitrogen compositional range where BN does not form) so as to mitigate Type IV failure in welded joints and to improve the creep strength of the base metal.

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Advances in materials technology for fossil power plants : proceedings from the sixth International Conference, August 31-September 3, 2010, Santa Fe, New Mexico, USA by D Gandy; J Shingledecker; Ramaswamy Viswanathan; Electric Power Research Institute.; et al


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