Constant load testing with in-situ hydrogen charging on martensitic ultra

In this work the hydrogen embrittlement of a UHSS martensitic steel was tested by means of the constant load testing method on notched tensile samples with in-situ cathodic hydrogen charging. As the method was developed to screen and compare various steel grades, charging conditions were chosen in such a way that rupture was obtained on a short time scale, i.e. of the order of minutes. Samples were tested at various levels of the nominal stress, i.e. from 550 MPa to 1200 MPa. Detailed data analysis was combined with finite element simulations of the stress state ahead of the notch in order to obtain a correct insight in the mechanical behaviour. Afterwards, interrupted tests were performed and the samples were retained for in-depth characterization by means of EBSD to get a first insight in the crack propagation mechanisms.

ISBN:9789081794206

Toegankelijkheid:Closed