Influence of pre-deformation on fatigue life of high strength steels by means of micromagnetic Barkhausen noise

Author:

Sarafraz Yashar1ORCID,Brink Malte1,Baak Nikolas1ORCID,Koch Alexander1ORCID,Walther Frank1ORCID

Affiliation:

1. Chair of Materials Test Engineering , TU Dortmund University , Baroper Str. 303, Dortmund D - 44227 , Germany

Abstract

Abstract The micromagnetic Barkhausen noise as a nondestructive testing method was employed in this work to analyze the fatigue behavior of high-strength steels by subjecting them to multi-stage load increase fatigue tests. The micromagnetic Barkhausen noise energy (MBNEnergy) was measured during fatigue tests and coupled with digital image correlation to evaluate the effect of static and cyclic stress as well as local surface strain on MBNEnergy. The test samples were prepared from the forged bainite 18MnCrMoV6 and two ferrite-pearlite 38MnVS6 and 46MnVS5 steels. A part of the specimens was pre-strained before cyclic loading to analyze the effect of pre-deformation on cyclic strength considering measured MBNEnergy. A significant increase in MBNEnergy was observed by increasing the cyclic load on 18MnCrMoV6 specimens with bainite phases while this increase of MBNEnergy was not significant or was not changed for ferrite-pearlite steels 38MnVS6 and 46MnVS5.

Funder

Forschungsvereinigung Stahlanwendung

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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