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000792517 0247_ $$2Laufende Nummer$$a39410
000792517 0247_ $$2datacite_doi$$a10.18154/RWTH-2020-06177
000792517 037__ $$aRWTH-2020-06177
000792517 041__ $$aEnglish
000792517 082__ $$a620
000792517 1001_ $$0P:(DE-588)1212265661$$aFan, Xiuru$$b0$$urwth
000792517 245__ $$aOptimization of laves phase strengthened high performance ferritic stainless steels$$cvorgelegt von Frau Xiuru Fan, Master of Engineering$$honline
000792517 246_3 $$aOptimierung mittels Laves-Phase verfestigter ferritischer Hochleistungsstähle$$yGerman
000792517 260__ $$aAachen$$c2020
000792517 300__ $$a1 Online-Ressource (IX, 143 Seiten) : Illustrationen, Diagramme
000792517 3367_ $$02$$2EndNote$$aThesis
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000792517 3367_ $$2BibTeX$$aPHDTHESIS
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000792517 500__ $$aVeröffentlicht auf dem Publikationsserver der RWTH Aachen University
000792517 502__ $$aDissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2020$$bDissertation$$cRheinisch-Westfälische Technische Hochschule Aachen$$d2020$$gFak05$$o2020-05-27
000792517 5203_ $$lger
000792517 520__ $$aThis research aims at the development and optimization of High Performance Fully Ferritic (HiperFer) stainless steel. HiperFer steels were designed for the application in the next generation of ultra-supercritical thermal power conversion systems, with the steam working atmosphere at high temperature. Optimization of the newly designed HiperFer alloys via chemical composition adjustment and thermal / thermomechanical processing was investigated， and potential practical applications of HiperFer alloy were discussed. Microstructure and mechanical properties of HiperFer steels are highly influenced by alloying composition and thermal / thermomechanical treatment. In addition, the thermomechanical treatment window of HiperFer alloys is influenced by the chemical composition. Thermomechanical treatment including thermal and combined thermal - mechanical treatment is an advanced approach to optimize the properties of this type of steels. Recrystallization, precipitation treatment and mechanical deformation during the forming process highly influence the microstructure of HiperFer and thus the resulting mechanical properties. The interrelations between chemical composition and the resulting thermomechanical treatment windows are complex. For this reason, particle nucleation and growth, size and density of particles, as well as the influence of different chemical compositions on the thermomechanical treatment window were investigated. To widen the scope of potential practical applications of HiperFer, further adjustments of chemical composition were implemented. The impact of changes in thermomechanical treatment parameters on microstructure and mechanical properties was investigated in detail, by thermomechanical treatment simulation in laboratory scale and accompanying microstructure characterization on various length scales. This provided a systemic view of the impact of different treatment parameters on microstructure evolution and mechanical properties. Furthermore, the impact of alloying elements in interrelation with processing parameters was analyzed, and finally the influence of chemical composition on the resulting thermomechanical processing window was investigated. The results contribute to optimization of the HiperFer steels in various instances: First, modified alloying compositions have been derived to increase mechanical strength, which provide a broader range of potential applications; Second, process parameters can now be estimated based on the chemical composition, which saves a large amount of experimental work and supports the transfer to industrial processing; Third, combining thermodynamics and processing recursive optimization of both composition and processing according to desired mechanical properties will become possible by implementing the experimental data from this research into modelling tools.$$leng
000792517 588__ $$aDataset connected to Lobid/HBZ
000792517 591__ $$aGermany
000792517 653_7 $$acreep
000792517 653_7 $$aferritic stainless steel
000792517 653_7 $$ahigh temperature steel
000792517 653_7 $$alavesphase
000792517 653_7 $$athermomechanical processing
000792517 7001_ $$0P:(DE-82)782222$$aSchwaiger, Ruth$$b1$$eThesis advisor
000792517 7001_ $$0P:(DE-82)IDM03454$$aKrupp, Ulrich$$b2$$eThesis advisor$$urwth
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000792517 961__ $$c2020-08-10T10:33:04.184142$$x2020-06-15T13:05:11.555970$$z2020-08-10T10:33:04.184142
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