Abstract
In this study, the magnetic properties of a single martensite particle were investigated using type 304 stainless wire, which can reduce the number of crystal grains per unit area. First, the magnetization curve of wire specimens with different martensite fractions was measured by a SQUID magnetic flux meter. Then, the coercivity and susceptibility parameters were evaluated from the magnetization curve and factors contributing to these parameters were discussed. It was found that the coercivity values along the long and short axes of wire specimens with a diameter of 0.4 mm increased and subsequently decreased with an increase in the martensite fraction. Further, the susceptibility values of the same specimen along the long axis increased and along the short axis decreased with increasing martensite fractions. The results indicate that the coercivity and susceptibility of a martensite particle are affected by the size of variant clusters and the shape anisotropy of the martensite particle.
Highlights
Austenitic stainless steel, including type 304 stainless steel (SUS304), is an interesting magnetic composite material due to the ferromagnetic martensite particles generated by plastic deformation
Their result suggests that the dichotomy between the experimental and theoretical results may be resolved by factoring in the possibility that the magnetization curve of a single martensite particle may vary with its size and morphology
The martensite phase generates the TRIP effect, which is a phenomenon for developing strength and ductility in SUS304.5 Because the strength of the martensite phase is important for this effect and is controlled by the internal structure, the evaluation by magnetic measurement is useful for plastic working
Summary
Austenitic stainless steel, including type 304 stainless steel (SUS304), is an interesting magnetic composite material due to the ferromagnetic martensite particles generated by plastic deformation. Miura et al. showed that the coercivity of SUS304 first increased and subsequently decreased with increasing martensite fraction This is consistent with the dependence of coercivity on the grain size of the nanocrystalline materials.. This is consistent with the dependence of coercivity on the grain size of the nanocrystalline materials.4 Their result suggests that the dichotomy between the experimental and theoretical results may be resolved by factoring in the possibility that the magnetization curve of a single martensite particle may vary with its size and morphology. The martensite phase generates the TRIP effect, which is a phenomenon for developing strength and ductility in SUS304.5 Because the strength of the martensite phase is important for this effect and is controlled by the internal structure, the evaluation by magnetic measurement is useful for plastic working
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