Extended TOF-SIMS analysis on low-nickel austenitic stainless steels: The influence of oxide layers on hydrogen embrittlement

Izawa, Chika

dc.contributor.advisor	Pundt, Astrid Prof. Dr.
dc.contributor.author	Izawa, Chika
dc.date.accessioned	2016-01-18T09:37:24Z
dc.date.available	2016-01-18T09:37:24Z
dc.date.issued	2016-01-18
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-0028-8693-0
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-5460
dc.language.iso	eng	de
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc	530	de
dc.title	Extended TOF-SIMS analysis on low-nickel austenitic stainless steels: The influence of oxide layers on hydrogen embrittlement	de
dc.type	doctoralThesis	de
dc.contributor.referee	Pundt, Astrid Prof. Dr.
dc.date.examination	2015-07-21
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	Hydrogen embrittlement (HE) of low-nickel austenitic stainless steels were studied with special attention to the impact of the microstructural properties such as strain induced α’-martensite, grain size, dislocation density and dislocation structure, and oxide layer. The susceptibility of the steels to HE was judged in accordance with the relative reduction of area (RRA). With careful evaluation, Md30 temperature (Nohara), which assesses martensitic transformability of steels, is adopted as a new indicator to predict HE of austenitic stainless steels. The RRA-values obtained in this study and reported data vs Md30 temperature (Nohara) reveals three distinct regions; (1) above -80 °C of Md30, RRA-values decrease with increasing Md30 temperature, (2) around -80 °C, a large variation in RRA-values (threshold band), (3) below -80 °C, constant RRA-values of nearly 100 %. Some data points deviated from the trend line in the RRA-values vs Md30 is attributed to the microstructural properties. With the careful evaluation of the impact of the oxide layer, the RRA values higher than the trend line are linked with the oxide layer type of “high constant oxide level” characterized by TOF-SIMS.	de
dc.contributor.coReferee	Kirchheim, Reiner Prof. Dr.
dc.subject.eng	Oxide layer	de
dc.subject.eng	Hydrogen Embrittlement	de
dc.subject.eng	Austenitic Stainless Steel	de
dc.subject.eng	TOF-SIMS	de
dc.subject.eng	SIMS	de
dc.subject.eng	Md30	de
dc.subject.eng	Surface Analysis	de
dc.subject.eng	Martensite Transformation	de
dc.identifier.urn	urn:nbn:de:gbv:7-11858/00-1735-0000-0028-8693-0-0
dc.affiliation.institute	Fakultät für Physik	de
dc.identifier.ppn	846018780

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