Abstract
The results of high-accuracy magnetic measurements on SUS 316LN austenitic stainless steel compressively deformed at room temperature (RT) are reported here. Even after the mild deformation of ∼25% true strain (ε t ), the ferromagnetic phase (α′-martensite) could be clearly observed which increased sharply on further deformation. The amount of α′ was very small (0.18 vol% at ε t ≈ 60%) when compared to the reported data for other grades of austenitic steels such as 304, 304L, 316, and 316L. The strain-induced α′-martensite is further studied by magnetic hysteresis loops. The coercivity (H C) and remanence (M r) were analyzed by subtracting the paramagnetic contribution of the bulk austenite structure. While H C was found to decrease with α′, M r remained the same (∼67 emu/g) when normalized to the volume fraction of α′. The decreasing H C with increasing α′ and/or ε t is presumed to be due to the domain wall pinning at the grain boundaries when the cluster size exceeds the domain wall width.
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Manjanna, J., Kobayashi, S., Kamada, Y. et al. Martensitic transformation in SUS 316LN austenitic stainless steel at RT. J Mater Sci 43, 2659–2665 (2008). https://doi.org/10.1007/s10853-008-2494-4
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DOI: https://doi.org/10.1007/s10853-008-2494-4