Evolution of Microstructure During Long-term Creep of a Tempered Martensite Ferritic Steel PDF Download

Author: Ali Aghajani Bazazi
Publisher:
ISBN: 9783869551821
Category :
Languages : en
Pages : 0

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Author: Ali Aghajani Bazazi
Publisher: Cuvillier Verlag
ISBN: 3736931824
Category : Technology & Engineering
Languages : en
Pages : 118

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Book Description
Tempered martensite ferritic steels are used for critical components in fossil fired power plants that operate in the creep range. The materials contain a high density of dislocations and precipitates form on all types of internal interfaces, the majority of which represent subgrain boundaries. Most previous studies suffer from either only relating to short term creep experiments or from being incomplete in not considering all relevant elements of the microstructure. No systematic effort was made to investigate the evolution of microstructures under conditions of long term creep. In the present study the evolution of the microstructure of a 12% Cr tempered martensite ferritic steel was investigated under conditions of long term aging and creep. Transmission electron microscopy (TEM) and electron back scattered diffraction (EBSD) techniques were used to characterize materials from interrupted creep tests (0.5%, 1%, 1.6% and rupture at 11.9%; creep conditions: 550°C, 120 MPa, rupture time: 139 971 h). It is shown that subgrains coarsen, that the close correlation between carbides and subgrain boundaries loosens during long term creep, and that the frequency of small angle boundaries increases. In addition, the evolution of dislocation densities during long term aging and creep was studied using high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM). During aging the dislocation density remains constant, while during long term creep the dislocation density continuously decreases. All these elementary deformation processes have already been discussed in short term creep studies. The present study shows that they also govern long term creep, however, during long term creep, precipitation and coarsening reactions occur which are not observed during short term creep. Cr rich M23C6, VX carbides and Laves phase were identified as the major precipitates in the microstructure of the 12% Chromium tempered martensite ferritic steel. Their chemical compositions, sizes, volume fractions and number densities were evaluated in all interrupted specimens. M23C6 particles coarsen and establish their equilibrium concentration after 51072 hours. VX particles are stable. The Laves phase particles do not reach thermodynamic equilibrium as they form and grow during long term creep. This is due to Silicon which is found in the Laves phase particles and which diffuses slowly in the steel matrix.

Author: Shirin Fahimi
Publisher:
ISBN: 9783844048681
Category :
Languages : en
Pages :

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Author: The Minerals, Metals & Materials Society (TMS)
Publisher: John Wiley & Sons
ISBN: 1119027993
Category : Technology & Engineering
Languages : en
Pages : 1073

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This DVD contains a collection of papers presented at EnergyMaterials 2014, a conference organized jointly by The ChineseSociety for Metals (CSM) and The Minerals, Metals & MaterialsSociety (TMS), and held November 4-6, 2014, in Xi’an, ShaanxiProvince, China. With the rapid growth of the world’s energyproduction and consumption, the important role of energy materialshas achieved worldwide acknowledgement. Material producers andconsumers constantly seek the possibility of increasing strength,improving fabrication and service performance, simplifyingprocesses, and reducing costs. Energy Materials 2014 has provided aforum for academics, researchers, and engineers around the world toexchange state-of-the-art development and information on issuesrelated to energy materials. The papers on the DVD are organized around the followingtopics: Materials for Coal-Based Systems Materials for Gas Turbine Systems Materials for Nuclear Systems Materials for Oil and Gas Materials for Pressure Vessels

Author: The Minerals, Metals & Materials Society (TMS)
Publisher: Springer
ISBN: 3319487655
Category : Technology & Engineering
Languages : en
Pages : 899

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Author: Jing Tao Han
Publisher: Trans Tech Publications Ltd
ISBN: 3038265047
Category : Technology & Engineering
Languages : en
Pages : 2870

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Collection of selected, peer reviewed papers from the 2014 International Conference on Manufacturing Science and Engineering (ICMSE 2014), April 19-20, 2014, Shanghai, China. The 508 papers are grouped as follows: Chapter 1: Alloys and Non-Ferrous Materials, Chapter 2: Iron and Steel, Chapter 3: Composites, Chapter 4: Micro/Nano Materials and Technologies, Chapter 5: Ceramics, Chapter 6: Optical/Electronic/Magnetic Materials and Technologies, Chapter 7: Building and Construction Research, Chapter 8: Environment-Friendly Materials, Chapter 9: Biomaterials and Bioresearch, Chapter 10: Polymer Materials, Chapter 11: Film Materials, Chapter 12: Textile Materials and Technologies, Chapter 13: Corrosion and Surface Treatment Technology, Chapter 14: Materials Mechanical Behavior and Fracture, Chapter 15: Surface Engineering / Coatings Technology, Chapter 16: Forming Technologies, Chapter 17: Material Machining, Chapter 18: Welding and Joining, Chapter 19: Micro-Fabrication Techniques, Chapter 20: Laser Processing Technology, Chapter 21: Machining Tools, Testing Technologies and Error Measurement, Chapter 22: Modeling, Analysis and Simulation of Processes, Chapter 23: Thermal Engineering Theory and Applications, Chapter 24: Mineral and Soil Mining and Processing

Author: Wei Yan
Publisher: Springer
ISBN: 3319148397
Category : Technology & Engineering
Languages : en
Pages : 223

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With China becoming a major force in steel research and development, this book highlights the work of a group from the Chinese Academy of Sciences, led by the first four authors. This group has the ideal knowledge base for writing this updated book on heat-resistant steels. The fifth author, Sha, based in the UK, has been collaborating with the Chinese group since 2009 and is the lead or sole author of four research books, all published in English. The last book, “Steels: from materials science to structural engineering,” was published by Springer in 2013. Within two months of its publication, researchers at the University of Science and Technology Liaoning had requested translation of the book into Chinese. Springer obliged, and the Chinese version was published by the Metallurgical Industry Press, Beijing, in August 2014. Sha has organized and completed the writing of the proposed book, though the main research was done in China.

Author: M. Chen
Publisher: IOS Press
ISBN: 1643684396
Category : Technology & Engineering
Languages : en
Pages : 1172

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New engineering materials, techniques and applications are constantly being researched and developed, and keeping up to speed with the latest advances is crucial for engineers if they are to successfully address the challenges they face in their work. This book presents the selected proceedings of MMSE2023, the 9th International Conference on Advances in Machinery, Materials Science and Engineering Applications, jointly organized by the SAE-Supmeca, France and China University of Geosciences (Wuhan) and held on 22 and 23 July 2023 in Wuhan, China. For the past 12 years, this annual conference has collated recent advances and experiences, identified emerging trends and provided a platform for participants from academia and industry to exchange information and views, helping to address the world’s machinery and engineering challenges. The book contains 4 sections: mechanical engineering, material science and manufacturing technology; electrical engineering, automation and control; modeling, simulation and optimization techniques in engineering; and advanced engineering technologies and applications. A total of 241 submissions were received for MMSE2023, of which 151 papers were selected for the conference and for publication by means of a rigorous international peer-review process. These papers present exciting ideas and methods that will open novel research directions for different communities. Offering a current overview of the latest research and applications in machinery and materials-science engineering, the book will be of interest to all those working in the field.

Author: J. Shingledecker
Publisher: ASM International
ISBN: 1627082727
Category : Technology & Engineering
Languages : en
Pages : 1500

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Proceedings from: EPRI’s 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials

Author: Elizabeth Holm
Publisher: Springer
ISBN: 3319487701
Category : Technology & Engineering
Languages : en
Pages : 315

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This collection represents a cross-section of the papers presented at the 6th International Conference on Recrystallization and Grain Growth. The volume is divided into nine sections: • Grain growth theory and simulation • Recrystallization theory and simulation • Low carbon and IF steels • High strength steels • Electrical steels • Stainless steels • Aluminum and magnesium alloys • Nickel and nickel based superalloys • Unconventional and advanced materials