Zhendong Sheng

Effect of Cut-edge Properties on Hydrogen Embrittlement of Three High-Mn Steels


Front	Back

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

Bindung:

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.