Measurement of phase transformation in steels using electromagnetic sensors
- 1 December 2002
- journal article
- research article
- Published by SAGE Publications in Iron and Steelmaking
- Vol. 29 (6), 469-476
- https://doi.org/10.1179/030192302225004610
Abstract
An electromagnetic (EM) sensor, capable of detecting the formation of ferromagnetic ferrite from paramagnetic austenite below the Curie temperature, has been developed and assessed. The long term aim of this work is to develop a method for monitoring microstructure online during strip steel processing. In the present paper, the initial results of variation in trans-impedance with microstructure obtained for three different types of steel with varying carbon contents are discussed. It was found that the EM sensor can successfully detect the formation of ferrite below the Curie temperature, but trans-impedance values are affected by the presence of a decarburised ferrite ring that forms around the specimens tested in a furnace. It was also found that the trans-impedance value is monotonically (non-linearly) related to ferrite volume fraction, and depends on the morphology and distribution of the ferromagnetic phase and, hence, is influenced by the prior austenite grain size.Keywords
This publication has 7 references indexed in Scilit:
- Using electromagnetic methods to monitor the transformation of steel samplesTransactions of the Institute of Measurement and Control, 2001
- The use of thermal analysis techniques for the validation of phase transformation modelsSteel Research, 1994
- Microstructural characterisation of two phase materialsMaterials Science and Technology, 1993
- Industrial on-line texture determination in rolled steel stripsJournal of Nondestructive Evaluation, 1993
- Eddy current methods for evaluation of the transformed fraction of metals by voltage sourceIEEE Transactions on Magnetics, 1990
- An X-ray diffraction method for quantitative determination of retained austenite in the production line of metastable austenitic stainless steel.Transactions of the Iron and Steel Institute of Japan, 1983
- Influence des conditions de laminage sur la qualité métallurgique des bandes d’acier extra-doux laminées sur trains continus a chaudRevue de Métallurgie, 1964