CUED Publications database

Laser stimulated grain growth in 304 stainless steel anodes for reduced hydrogen outgassing

Gortat, D and Sparkes, M and Fairchild, SB and Murray, PT and Cahay, MM and Back, TC and Gruen, GJ and Lockwood, NP and O'Neill, W (2017) Laser stimulated grain growth in 304 stainless steel anodes for reduced hydrogen outgassing. In: UNSPECIFIED.

Full text not available from this repository.

Abstract

Metal anodes in high power microwave (HPM) devices Erode during operation due to hydrogen outgassing and plasma formation; both of which are thermally driven phenomena generated by the electron beam impacting the anode's surface. This limits the lowest achievable pressure in an HPM device, which reduces its efficiency. Laser surface melting the 304 stainless steel anodes by a continuous wave fiber laser showed a reduction in hydrogen outgassing by a factor of ∼4 under 50 keV electron bombardment, compared to that from untreated stainless steel. This is attributed to an increase in the grain size (from 40 - 3516 μm ), which effectively reduces the number of characterized grain boundaries that serve as hydrogen trapping sites, making such laser treated metals excellent candidates for use in HPM applications. 2

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Div E > Manufacturing Systems
Depositing User: Cron Job
Date Deposited: 30 Jan 2019 21:29
Last Modified: 10 Apr 2021 00:38
DOI: 10.1117/12.2252094