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The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications./
Author:	Gross, Cameron Thomas.
Description:	1 online resource (133 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9781369817706

The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications.
Gross, Cameron Thomas.

The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications. - 1 online resource (133 pages)

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

This item is not available from ProQuest Dissertations & Theses.

In today's rapidly changing world, there is constant demand for the development of new, high performance materials. Fire resistant steels can provide greater safety in the event of a building fire, creep resistant stainless steels can allow for higher power plant efficiency, and cobalt based superalloys have potential for use in high performance turbine blades. In order to accelerate the design and development of new materials, we have combined computational thermodynamics, multimodal characterization and analysis, and mechanical testing to develop a design approach for the rapid creation of high performance alloys.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369817706Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications.
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245 1 4 $a The Design and Development of Precipitation Strengthened Fe- and Co- Alloys for High Temperature Applications.
264 0 $c 2017
300 $a 1 online resource (133 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Adviser: Yip-Wah Chung.
502 $a Thesis (Ph.D.) $c Northwestern University $d 2017.
504 $a Includes bibliographical references
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a In today's rapidly changing world, there is constant demand for the development of new, high performance materials. Fire resistant steels can provide greater safety in the event of a building fire, creep resistant stainless steels can allow for higher power plant efficiency, and cobalt based superalloys have potential for use in high performance turbine blades. In order to accelerate the design and development of new materials, we have combined computational thermodynamics, multimodal characterization and analysis, and mechanical testing to develop a design approach for the rapid creation of high performance alloys.
520 $a We applied this comprehensive design approach to develop a series of structural steels requiring two-thirds yield strength retention at 600°C. The result is a series of low-carbon ferritic steels with small alloying additions of V, Nb, and Mo that maintain over 80% of room-temperature yield strength in compression, and nearly 70% in tension, after 2 hours exposure at 600°C. The best alloy possesses yield strengths of 442 +/- 32 MPa (room temperature) and 368 +/- 18 MPa (at 600°C) in compression and 409 +/- 40 (room temperature) and 284 +/- 33 MPa (600°C) in tension. The steels were air-cooled after normalization with no thermomechanical processing. Atom probe tomography demonstrates the formation of thermally stable, nanoscale MX (where M = V + Nb + Mo and X = C + N) monocarbonitride precipitates after exposure to 600°C. This design process was extended to include corrosion resistant stainless steels containing 10 wt. % Cr for use in steam-driven power plants. High-temperature Vickers measurements demonstrated that these steels maintain their hardness for 1000 hours at 700°C. The favorable mechanical properties of these steels are derived from slow growing and coarsening nanoscale semi-coherent MX precipitates providing strengthening at elevated temperatures.
520 $a For some systems, phase information does not exist or is not available to the public. To extend this design process to include new alloy systems, we have developed a functional combinatorial synthesis procedure for ternary metal systems. This process combines the inherently high-throughput methods of confocal magnetron sputtering, photolithography, and high temperature vacuum annealing to efficiently synthesize materials libraries with a high degree of flexibility in composition. We probe the structures and precise compositions of these libraries using X-ray diffraction and X-ray fluorescence techniques. We have successfully synthesized and identified isothermal sections containing many compositions with stable binary alloys of the Co-Ni-Ta systems, such as hcp Co2Ta and rhombohedral Co3Ta. The composition and phases observed so far show good agreement with available information from existing ASM databases.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Northwestern University. $b Materials Science and Engineering. $3 1181794
773 0 $t Dissertation Abstracts International $g 78-10B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10261634 $z click for full text (PQDT)