Naotsugu Inakazu1 and Hisashi Yamamoto1
1College of Engineering, University of Osaka Prefecture, Sakai
The measurement of mechanical properties and the torsion fatigue test were carried out to find the correlation between the static strength and the torsion fatigue strength with various drawing ratios for the metastable austenitic stainless steel.
The tensile strength and elongation of the SUS 304 steel indicated higher values than those of the SUS 305J1 and XM7 steels, because the influence of the TRIP effect was the greatest on SUS 304 steel, but as for the workability the SUS 305J1 and XM7 steels were better than 304 steel.
Regarding the torsion fatigue strength, the durability of SUS 304 steel was the lowest, because the formation of induced martensite in SUS 304 steel accelerated the sensitivity against a crack-propagation during the fatigue test, while the durability of SUS 305J1 and XM7 steels was higher, because the development of the induced martensite did not hardly occur.
It was found that the development of the induced martensite improved the static strength with the TRIP phenomenon, but damaged the torsion fatigue strength.
austenitic stainless steel, mechanical properties, workability, strain-hardening, torsion fatigue strength
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