Study of microstress state of P91 steel using complementary mechanical Barkhausen, magnetoacoustic emission, and X-ray diffraction techniques
PBN-AR
Instytucja
Wydział Fizyki Technicznej i Matematyki Stosowanej (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
JOURNAL OF APPLIED PHYSICS
ISSN
0021-8979
EISSN
Wydawca
DOI
URL
Rok publikacji
2014
Numer zeszytu
17
Strony od-do
1-4
Numer tomu
115
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
EFEKT BARKHAUSENA
EFEKT MAGNETYCZNO-AKUSTYCZNY
NAPRĘŻENIA RESZTKOWE
NAPRĘŻENIA WEWNĘTRZNE
STALE FERROMAGNETYCZNE
Streszczenia
Język
Treść
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.
Inne
System-identifier
127052