In-situ investigation of strain-induced martensitic transformation kinetics in an austenitic stainless steel by inductive measurements
C. Alonso de Celada Casero (Centro Nacional de Investigaciones Metalúrgicas - CSIC, TU Delft - (OLD) MSE-3)
Harm Kooiker (Philips Advanced Technology Centre, University of Twente)
Manso Groen (Philips Advanced Technology Centre)
Jan Post (Rijksuniversiteit Groningen, Philips Advanced Technology Centre)
David San Martin (Centro Nacional de Investigaciones Metalúrgicas - CSIC)
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Abstract
An inductive sensor developed by Philips ATC has been used to study in-situ the austenite (γ) to martensite (α′) phase transformation kinetics during tensile testing in an AISI 301 austenitic stainless steel. A correlation between the sensor output signal and the volume fraction of α′-martensite has been found by comparing the results to the ex-situ characterization by magnetization measurements, light optical microscopy, and X-ray diffraction. The sensor has allowed for the observation of the stepwise transformation behavior, a not-well-understood phenomena that takes place in large regions of the bulk material and that so far had only been observed by synchrotron X-ray diffraction.
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