Product Information
- Author
- Herausgeber FKM
- EAN
- 4250697512546
- Edition
- 1999
- Delivery time
- next business day
Kriechgleichungen für warmfeste Kraftwerksstähle
139.10 EUR *
Gesamtpreis: 139.10 EUR *
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130.00 EUR excl. VAT
available
Description
Kriechgleichungen für warmfeste Kraftwerksstähle
FKM 1999 Project No. 202
Abstract:
For the use of high-temperature steels in power plant and plant engineering, valid creep equations are required for the entire stress range of the components. After their development on individual materials, they are adapted to the respective average creep behavior of the steel grade. This is done on the basis of time-temperature parameter-based scattering band evaluations, which are carried out with the aid of a DESA program. In order to compensate for a possible predetermination of these creep equations via the effect of the time-temperature parameter, these require independent verification and, if necessary, optimization. This is possible on the basis of a creep curve compression with a KUSA program. This program can also be used to compensate for the increase in stress on the samples due to scale loss in order to establish an average creep equation that is free of the influence of scale. The project used these methods to develop and improve creep equations for important power plant steels. As an experimental basis, extensive creep tests were carried out on these steels in a wide stress range and supplemented. The established creep equations are based on the proven concept of the modified Garofalo equation. It is able to describe the initial plastic strain as well as the primary, secondary and tertiary creep with a high degree of accuracy. For the first time, parameter-based creep equations for the steel grades 14 MoV 6 3 for pipelines, GS-17 CrMoV 5 11 for cast housings and X' 3 CrNiMoN 17 13 for pipelines were established in this way. A creep equation for a single material was also established for the first time for the ,' - cast steel GS-17 CrMoV 5 11. For another steel, X 19 CrMoVNbN 11 1.fQr-~screws, the creep equation was immediately established for the steel grade as a special feature due to the heterogeneous behavior of some individual materials. An optimized creep curve-based equation was created for a 1 % CrMoNiV steel for turbine shafts and larger forgings according to SEW 555. In addition, a scale-independent optimized creep equation was created for this steel, which avoids an overly conservative calculation for large component cross-sections. The equations are suitable for the calculation of statically or quasi-statically stressed components in the creep range and are validated by recalculation of verification tests. For application, the equations are provided in the form of a KARA FW program package as user subroutines for finite element program systems such as ABAQUS. The objective of the research project was achieved.
Scope of report:
76 p., 134 fig., 28 tab., 110 lit.
Start of work:
01.07.1995
End of work:
30.06.1998
Funding body:
AVIF - No. A94
Research unit:
Institute of Materials Science Technical University of Darmstadt
Author:
Prof. Dr.-lng. C. Berger Dr.-lng. J. Granacher, Dr.-lng. J. Kostenko
Chairman of the working group:
Dr.-lng. H. Bartsch, ABB Power Generation Ltd.
Chairman of the advisory board:
Prof. Dr.-lng. Kipphan Heidelberger Druckmaschinen AG, Heidelberg
Abstract:
For the use of high-temperature steels in power plant and plant engineering, valid creep equations are required for the entire stress range of the components. After their development on individual materials, they are adapted to the respective average creep behavior of the steel grade. This is done on the basis of time-temperature parameter-based scattering band evaluations, which are carried out with the aid of a DESA program. In order to compensate for a possible predetermination of these creep equations via the effect of the time-temperature parameter, these require independent verification and, if necessary, optimization. This is possible on the basis of a creep curve compression with a KUSA program. This program can also be used to compensate for the increase in stress on the samples due to scale loss in order to establish an average creep equation that is free of the influence of scale. The project used these methods to develop and improve creep equations for important power plant steels. As an experimental basis, extensive creep tests were carried out on these steels in a wide stress range and supplemented. The established creep equations are based on the proven concept of the modified Garofalo equation. It is able to describe the initial plastic strain as well as the primary, secondary and tertiary creep with a high degree of accuracy. For the first time, parameter-based creep equations for the steel grades 14 MoV 6 3 for pipelines, GS-17 CrMoV 5 11 for cast housings and X' 3 CrNiMoN 17 13 for pipelines were established in this way. A creep equation for a single material was also established for the first time for the ,' - cast steel GS-17 CrMoV 5 11. For another steel, X 19 CrMoVNbN 11 1.fQr-~screws, the creep equation was immediately established for the steel grade as a special feature due to the heterogeneous behavior of some individual materials. An optimized creep curve-based equation was created for a 1 % CrMoNiV steel for turbine shafts and larger forgings according to SEW 555. In addition, a scale-independent optimized creep equation was created for this steel, which avoids an overly conservative calculation for large component cross-sections. The equations are suitable for the calculation of statically or quasi-statically stressed components in the creep range and are validated by recalculation of verification tests. For application, the equations are provided in the form of a KARA FW program package as user subroutines for finite element program systems such as ABAQUS. The objective of the research project was achieved.
Scope of report:
76 p., 134 fig., 28 tab., 110 lit.
Start of work:
01.07.1995
End of work:
30.06.1998
Funding body:
AVIF - No. A94
Research unit:
Institute of Materials Science Technical University of Darmstadt
Author:
Prof. Dr.-lng. C. Berger Dr.-lng. J. Granacher, Dr.-lng. J. Kostenko
Chairman of the working group:
Dr.-lng. H. Bartsch, ABB Power Generation Ltd.
Chairman of the advisory board:
Prof. Dr.-lng. Kipphan Heidelberger Druckmaschinen AG, Heidelberg
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