期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 324, 期 15, 页码 2388-2391出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2012.03.007
关键词
Austenitic stainless steel; Aging; Thermomagnetic analysis
资金
- National Science Council of Taiwan [NSC 97-2221-E-006-006-MY3, NSC 98-2221-E-006-066-MY3]
The evolution of the magnetic phase upon aging at 300-520 degrees C in a heavily cold-drawn AISI 316L austenitic stainless steel fiber was studied using thermomagnetic analysis (TMA) and magnetic force microscopy with a heating stage. An increasing trend of magnetization from 50 degrees C to around 470 degrees C in the heating curves of TMA in austenitic stainless steels after a cold-drawing process was observed. No significant Ms temperature signal in the TMA curve at cooling indicated an increase in magnetization upon cooling period without significant phase transformation. A series of in situ magnetic force microscopy observations reveal a growth of the magnetic domain structure after aging at 300 degrees C for 2.5 h. Results show that the ferromagnetic increase during aging at lower annealing temperature resulted from the growth of martensite. (C) 2012 Elsevier B.V. All rights reserved.
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