Study of microstress state of P91 steel using complementary mechanical Barkhausen, magnetoacoustic emission, and X-ray diffraction techniques

Bolesław Augustyniak; Leszek Piotrowski; Paweł Maciakowski; Marek Chmielewski; Marzena Lech-Grega; Janusz Żelechowski

doi:10.1063/1.4862224

Study of microstress state of P91 steel using complementary mechanical Barkhausen, magnetoacoustic emission, and X-ray diffraction techniques

Abstract

The paper deals with assessment of microstress state of martensite P91 steel using three complementary techniques: mechanical Barkhausen emission, magnetoacoustic emission (MAE), and X-ray diffraction (XRD) profile analysis. Magnetic coercivity Hc and microstructure were investigated with inductive magnetometry and magnetic force microscopy (MFM), respectively. Internal stress level of P91 steel was modified by heat treatment. Steel samples were austenitized, quenched, and then tempered at three temperatures (720 °C, 750 °C, and 780 °C) during increasing time (from 15 min up to 240 min). The microstrain level ε i was evaluated using Williamson–Hall method. It was revealed that during tempering microstrain systematically decreases from ε i = 2.5 × 10−3 for as quenched state down to ε i = 0.3 × 10−3 for well tempered samples. Both mechanical hardness (Vicker's HV) and magnetic hardness (coercivity) decrease almost linearly with decreasing microstrain while the MAE and MBE intensities strongly increase. Tempering leads to evident shift of the MeBN intensity maximum recorded for the first load towards lower applied strain values and to increase of MAE intensity. This indicates that the microstress state deduced by magnetic techniques is correlated with microstrains evaluated with XRD technique.

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Authors (6)

Bolesław Augustyniak dr hab.
Leszek Piotrowski dr hab. inż.
Paweł Maciakowski mgr inż.
Marek Chmielewski dr inż.
Marzena Lech-Grega
- Instytut Metali Nieżelaznych Instytut Metali Nieżelaznych
Janusz Żelechowski
- Instytut Metali Nieżelaznych Instytut Metali Nieżelaznych

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: JOURNAL OF APPLIED PHYSICS no. 115, edition 17, pages 1 - 4,
ISSN: 0021-8979
Language:: English
Publication year:: 2014
Bibliographic description:: Augustyniak B., Piotrowski L., Maciakowski P., Chmielewski M., Lech-Grega M., Żelechowski J.: Study of microstress state of P91 steel using complementary mechanical Barkhausen, magnetoacoustic emission, and X-ray diffraction techniques// JOURNAL OF APPLIED PHYSICS. -Vol. 115, iss. 17 (2014), s.1-4
DOI:: Digital Object Identifier (open in new tab) 10.1063/1.4862224
Verified by:: Gdańsk University of Technology