期刊
MATERIALS TODAY COMMUNICATIONS
卷 27, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2021.102188
关键词
Plastic damage; Nondestructive evaluation; Micromagnetic characteristic; Martensitic transformation; Austenitic stainless steel
资金
- National Natural Science Foundation of China [51967014, 51765048, 51765049]
- Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province [20204BCJ23001]
In this study, in-situ magnetic monitoring technology was used to observe the variation of surface magnetic induction intensity of 304 stainless steel specimens during tensile testing. The magnetic induction intensity showed a nonlinear relationship with strain, and magnetic susceptibility and remanence were positively correlated with strain. Microstructure morphology analysis revealed that the austenite structure of 304 stainless steel transformed into martensite after plastic deformation.
An in-situ magnetic monitoring technology was used to observe the surface magnetic induction intensity variation of 304 stainless steel specimens during the tensile process. A magnetization test was conducted to investigate the relationship between the strain and magnetization characteristic parameters. The change mechanism of micromagnetic signal induced by plastic deformation was analyzed through microstructure morphology observation. Results suggested that the magnetic induction intensity changed nonlinearly with the strain, which corresponded to the elastic, strengthening, and necking stages of engineering stress-strain curve until fracture. The magnetic susceptibility and remanence were positively correlated with the strain, and the two parameters presented an abrupt change when the specimen was close to the yield state. The microstructure morphology showed that the austenite structure of 304 stainless steel transformed to martensite after plastic deformation, and the content of this strain-induced martensite increased with the increase in strain.
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