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- Author
- Herausgeber FKM
- EAN
- 4250697510184
- Edition
- 2006
- Delivery time
- next business day
Kriechermüdungsbeschreibung von Stahlsorten
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Description
Kriechermüdungsbeschreibung von Stahlsorten
FKM 2006
Issue No. 289
Project No. 250
Abstract:
The project aimed at the steel grade-related computer-aided description of the creep fatigue behavior of important high-temperature steels used in thermal mechanical and plant engineering. To simulate this stress, a computer-aided prediction of the cracking behavior for steel grades was developed on the basis of a synthesis of cyclic deformation and the damage accumulation hypothesis to determine the computational damage. The experimental basis is formed by scatter band data on the creep rupture behavior and the fatigue and creep fatigue behavior of a total of 4 steel grades. In detail, these are a steel grade of type 1%CrMo(Ni)V as forging steel for turbine shafts and the corresponding modern steel grade of type 1 O%CrMo(W)VNbN. Furthermore, one steel grade of type 1 O%CrMo(W)VNbN casting and one 9%CrMo(W)VNb pipe were investigated. The experimental work included tests on a second and third melt of each of these steel grades on creep rupture and creep fatigue behavior. Corresponding investigations were carried out on the individual materials G17CrMoV5-10 and 23CrMoNiWV8-8, which are also of current interest. The user program set up to predict the number of cracking cycles comprises a synthesis of the stress-strain-time behavior and a subsequent evaluation of the calculated creep and fatigue damage, taking into account an interaction concept. This allows all cases from predominant creep damage to dominant fatigue damage to be evaluated. The applicability of this interaction concept was demonstrated for steel grades and the extended temperature range. Recommendations for the transferability of the computer-aided description to other materials were developed and relate to the necessary creep and creep fatigue experiments in the entire application temperature range. Furthermore, statements on the accuracy of predictions for the case of a reduced data set were obtained within the framework of sensitivity calculations. The computer-aided creep fatigue description provided in this work is used by designers and calculation engineers for service life calculations and for service life studies of operational multi-stage stress cases. The user benefits from the standard data available. The objective of the research project has been achieved. Scope of report:
200 p., 133 ill., 16 tab., 115 lit. Start of work:
01.06.2001 End of work:
31.03.2005 Funding body:
AVIF A 165 Research unit:
Institute for Materials Science at the Technical University of Darmstadt (lfWD) Prof. Dr.-lng. Christina Berger Dr.-lng. A. Scholz Processor and author:
Dipl.-lng. R. Znajda Chairman of the working group:
Dr.-lng. T.-U. Kern, Siemens, Power Generation
Issue No. 289
Project No. 250
Abstract:
The project aimed at the steel grade-related computer-aided description of the creep fatigue behavior of important high-temperature steels used in thermal mechanical and plant engineering. To simulate this stress, a computer-aided prediction of the cracking behavior for steel grades was developed on the basis of a synthesis of cyclic deformation and the damage accumulation hypothesis to determine the computational damage. The experimental basis is formed by scatter band data on the creep rupture behavior and the fatigue and creep fatigue behavior of a total of 4 steel grades. In detail, these are a steel grade of type 1%CrMo(Ni)V as forging steel for turbine shafts and the corresponding modern steel grade of type 1 O%CrMo(W)VNbN. Furthermore, one steel grade of type 1 O%CrMo(W)VNbN casting and one 9%CrMo(W)VNb pipe were investigated. The experimental work included tests on a second and third melt of each of these steel grades on creep rupture and creep fatigue behavior. Corresponding investigations were carried out on the individual materials G17CrMoV5-10 and 23CrMoNiWV8-8, which are also of current interest. The user program set up to predict the number of cracking cycles comprises a synthesis of the stress-strain-time behavior and a subsequent evaluation of the calculated creep and fatigue damage, taking into account an interaction concept. This allows all cases from predominant creep damage to dominant fatigue damage to be evaluated. The applicability of this interaction concept was demonstrated for steel grades and the extended temperature range. Recommendations for the transferability of the computer-aided description to other materials were developed and relate to the necessary creep and creep fatigue experiments in the entire application temperature range. Furthermore, statements on the accuracy of predictions for the case of a reduced data set were obtained within the framework of sensitivity calculations. The computer-aided creep fatigue description provided in this work is used by designers and calculation engineers for service life calculations and for service life studies of operational multi-stage stress cases. The user benefits from the standard data available. The objective of the research project has been achieved. Scope of report:
200 p., 133 ill., 16 tab., 115 lit. Start of work:
01.06.2001 End of work:
31.03.2005 Funding body:
AVIF A 165 Research unit:
Institute for Materials Science at the Technical University of Darmstadt (lfWD) Prof. Dr.-lng. Christina Berger Dr.-lng. A. Scholz Processor and author:
Dipl.-lng. R. Znajda Chairman of the working group:
Dr.-lng. T.-U. Kern, Siemens, Power Generation
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