Novel approach to image hydrogen distribution and related phase transformation in duplex stainless steels at the sub-micron scale. (28th September 2017)

• Record Type: Journal Article
• Authors: Sobol, Oded; Nolze, Gert; Saliwan-Neumann, Romeo; Eliezer, Dan; Boellinghaus, Thomas; Unger, Wolfgang E.S.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 39(2017)
• Page Start: 25114
• Page End: 25120
• Publication Date: 2017-09-28
• Subjects: Time-of-flight secondary ion mass spectrometry, ToF-SIMS -- Electron backscatter diffraction, EBSD -- Hydrogen assisted cracking -- Data fusion -- Lean duplex stainless steel; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.08.016
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The effect of electrochemical charging of hydrogen on the structure of a lean duplex stainless steel LDX 2101 ® (EN 1.4162, UNS S32101) was examined by both Time-of-Flight secondary ion mass spectrometry and electron back-scatter diffraction. The goal is to correlate hydrogen concentration and induced structural changes. Chemical and structural characterizations were done for the same region at the sample's surface with sub-micron spatial resolution. Regions of interest were varying in size between 50 × 50 μm and 100 × 100 μm. The results show a phase transformation of austenite to mainly a defect-rich BCC and scarcely a HCP phase. The phase transformation occurred in deuterium rich regions in the austenite. Highlights: An approach for correlating local hydrogen concentrations and structural changes. Different phase transformation in lean duplex compared to standard duplex steels. Formation of mainly defect-rich BCC phase in the former austenite.