Fe-Ni-C合金における残留オーステナイトによるTRIP現象
1975 年 24 巻 257 号 p. 150-155
詳細
1975 年 24 巻 257 号 p. 150-155
The relation between TRIP phenomenon and the amount of residual austenite was examined by means of tensile test at various temperatures using Fe-30%Ni-0.2%C specimens containing 13%, 41%, 76% and 100% austenite. The main results are as follows:
(1) The TRIP phenomenon was observed and the maximum elongation (δmax) increased linearly with volume fraction of austenite, when the amount of austenite was more than 41%. In case of 13% austenite, however, the TRIP was hardly observed.
(2) The peak temperature of elongation by TRIP decreased with decreasing the amount of austenite.
(3) In case of the tests at temperatures accompanying TRIP, the serrations caused by the formation of strain-induced martensite were observed in the stress-strain curves of the specimens containing more than 76% austenite.
(4) When the austenite was more than 76%, the phenomenon that 0.2% proof stress drops at temperatures around Ms was observed.
