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Title

Microstructure Characterization and Thermal Stability of Equal Channel Angular Pressing Processed Grade 91 Stainless Steel

Organization

Department: Nuclear Eng'g & Health Physics

University: Idaho State University College: Science & Engineering Department: Nuclear Eng'g & Health Physics 23

Document Attachments

Resource	Length	Width	Thickness
Paper	0	0	0

Specimen Elements

City

Pocatello

Coverage

Unknown to Unknown

Creator

Ryan Carnahan

Publisher

Idaho State University

Type

Thesis

Is Complete

No

Date Published

9/6/2018

Archive

digital

City: Pocatello

Degree

Master

Document Attachments

Abstracts

This work describes the microstructural characterization of Grade 91 stainless steel pre/post equal channel angular pressing (ECAP). Results are intended to be used as a baseline comparison for future neutron irradiation experiments to be performed in ATR. Ultra-fine grained Grade 91 is a potential structural material for advanced fast reactors. These samples are also ex-situ thermally annealed at 600, 700, and 800° C, and compared with in-situ thermal annealing at 700° C, a process which has never been done before with ECAP Grade 91. ASTAR is also performed for the first time on this material to obtain phase and orientation maps of ultra-fine precipitates (mostly Cr and V carbides). Significant grain and precipitate refinement was observed after ECAP processing. The bulk of dislocation networks recover in the first 15 minutes of annealing time. Also, the design and operation of a new experimental ECAP facility are described. Key words: Equal channel angular pressing (ECAP); Grade 91 stainless steel; In-situ thermal annealing; ASTAR