Zhendong ShengEffect of Cut-edge Properties on Hydrogen Embrittlement of Three High-Mn Steels | |||||||
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ISBN: | 978-3-8440-7156-6 | ||||||
Series: | Institut für Eisenhüttenkunde Herausgeber: Prof. Dr.-Ing. W. Bleck, Prof. Dr.-Ing. U. Krupp, Prof. Dr.-Ing. S. Münstermann and Prof. Dr.-Ing. D. Senk Aachen | ||||||
Volume: | 2020,1 | ||||||
Keywords: | Cutting; Hydrogen Embrittlement; Tensile Behavior; TWIP | ||||||
Type of publication: | Thesis | ||||||
Language: | English | ||||||
Pages: | 122 pages | ||||||
Figures: | 71 figures | ||||||
Weight: | 171 g | ||||||
Format: | 21 x 14,8 cm | ||||||
Binding: | Paperback | ||||||
Price: | 45,80 € / 57,30 SFr | ||||||
Published: | January 2020 | ||||||
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Abstract: | This study aims to fill a knowledge gap about the cutting effect on hydrogen embrittlement behavior of three different high manganese steels (HMnS). Slow strain rate tests are carried out on uncharged and hydrogen-charged specimens which were processed by four cutting technologies: electrical discharge machining, laser cutting, abrasive waterjet cutting, and blanking. Detailed investigations of the cut-edge quality in terms of microstructure and mechanical properties elucidated the cutting influences on hydrogen-influenced fracture in HMnS.
Electrical discharge machining and laser cutting belong to thermal cutting which have limited influences on the initial microstructure and produce a relatively smooth cut-edge. Both abrasive waterjet cutting and blanking involve plastic deformation, but blanking generates a significant hardening effect with microvoids and distorted grains in the shear-affected zone (SAZ). Due to these factors, the blanked specimens show the worst tensile ductility regardless of hydrogen charging. Conversely, without edge hardening, the thermal-cut specimens exhibit less sensitivity to hydrogen embrittlement. The SAZ of the blanked specimens behaves as a pre-crack effect during tension, which is facilitated by the deformation twin. |