Investigation of the Local Austenite Stability Related to Hydrogen Environment Embrittlement of Austenitic Stainless Steels

Robert Fussik; Gero Egels; Werner Theisen; Sebastian Weber

doi:10.4028/www.scientific.net/MSF.941.263

Paper Titles

VC-Precipitation Kinetics Studied by Small-Angle Neutron Scattering in Nano-Steels
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Ferrite-Martensite Dual-Phase Steel Produced by a Modified Quenching and Partitioning Process
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Investigation of the Local Austenite Stability Related to Hydrogen Environment Embrittlement of Austenitic Stainless Steels
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Magnetic Barkhausen Noise Characterization of the Recrystallization of a Non-Oriented Electrical Steel after Cold Rolling at Different Angles to the Hot Rolling Direction
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Investigation of the Local Austenite Stability...

Investigation of the Local Austenite Stability Related to Hydrogen Environment Embrittlement of Austenitic Stainless Steels

Abstract:

Hydrogen is increasingly considered as fuel for future mobility or for stationary applications. However, the safe distribution and storage of pure hydrogen is only possible with suitable materials. Interstitially dissolved hydrogen atoms in the lattice of numerous metals are responsible for hydrogen embrittlement (HE). If hydrogen is introduced by an external source, it is called hydrogen environment embrittlement (HEE). Commonly, steels like AISI 316L with a high resistance to HEE include a large number of alloying elements and in high amount. High alloying levels result in a decrease of cost-efficiency. Therefore, the systematic investigation of lean-alloyed austenitic stainless steels is necessary in order to understand the mechanism of HEE. For that purpose, the steel grades AISI 304L and AISI 316L are selected in this work. Tensile tests in air and 400 bar hydrogen gas atmospheres are performed. After tensile testing in H, AISI 304L revealed secondary cracks at the specimen surface, which are related to the local austenite stability, which in turn is affected by the level of micro-segregation. The microstructural investigations of the crack environment directly contribute to the understanding of the micro-mechanisms of HEE. Property-maps generated from experimentally measured distributions of alloying elements allow to correlate the impact of micro-segregations on the local austenite stability. It is shown, that local segregation-bands affect the initiation and propagation of secondary cracks. In this context, the local austenite stability which is significantly affected by the Ni distribution will be discussed in detail by comparison of the metastable austenitic steel grades AISI 304L and AISI 316L.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

263-268

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.263

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Online since:

December 2018

Authors:

Robert Fussik*, Gero Egels, Werner Theisen, Sebastian Weber

Keywords:

Austenitic Stainless Steel, Hydrogen Embrittlement, Micro-Segregation, Phase Stability, Secondary Cracks

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