Influence of Strain Rate on the Strain-Induced Martensite Transformation in Austenitic Steel AISI 321 and Barkhausen Noise Emission
Mária Čilliková, Nikolaj Ganev, Ján Moravec, Anna Mičietová, Miroslav Neslušan, Peter Minárik
TL;DR
This study explores how strain rate affects martensite formation and magnetic noise in a type of stainless steel.
Contribution
The study reveals that magnetic Barkhausen noise is strongly linked to strain-induced martensite and influenced by strain rate.
Findings
Martensite fraction increases from 10% to 42.5% with strain but drops to 25% at higher strain rates.
Magnetic Barkhausen noise is more sensitive to plastic deformation and strain rate than residual stress.
Martensite density enhances magnetic interactions, leading to stronger and more frequent Barkhausen noise pulses.
Abstract
This study investigates the evolution of strain-induced martensite (SIM) and its effect on magnetic Barkhausen noise (MBN) in AISI 321 austenitic stainless steel subjected to uniaxial tensile testing. Using X-ray diffraction and the Barkhausen noise technique, the formation and distribution of SIM were analysed as functions of plastic strain and strain rate. The results show that MBN is primarily governed by plastic deformation and strain rate rather than residual stress. The martensite fraction increases from 10% at low strains to 42.5% at high strains; however, accelerated strain rates significantly reduce martensite formation to approximately 25%. The increase in martensite density enhances the magnetic exchange interactions among neighbouring islands, resulting in stronger and more numerous MBN pulses. The anisotropy of MBN is also influenced by the initial crystallographic texture…
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Taxonomy
TopicsMagnetic Properties and Applications · Microstructure and Mechanical Properties of Steels · Non-Destructive Testing Techniques