| A study has been made to investigate the effects of various oxide particles on the nucleation and growth during strain induced dynamic transformation(SIDT) in Ti and Mg added steels. Compression tests have been carried out for steels with fine(20 ㎛), medium(90 ㎛) and coarse austenite(200 ㎛) microstructures at 750, 700 and 650℃ at a strain rate of 1s^-1. After the tests, specimens were water quenched and analyzed by OM, SEM and TEM. The results showed that the ferrite nucleation during SIDT was enhanced by Ti and Mg oxide particles as well as prior austenite boundaries via providing nucleation sites. On the other hand, the growth rate of ferrite formed by SIDT seemed to be more closely related with carbon in steel. |
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