| Title |
Multistage Deformation Behavior of Invar alloy with Declining Temperature |
| Authors |
권용환(Yong Hwan Kwon); 조상현(Sang Hyun Cho); 유연철(Yeon Chul Yoo) |
| Abstract |
Declining temperature multistage torsion tests were performed to study the deformational characteristics and static restoration of Invar alloy under 1100∼850℃, 4.0×10^(-2)∼2.6×10^0/sec and ti=2.5∼10sec conditions. From the analysis of multistage curves, the suitable condition for high temperature deformation could be determined. The fractional softening(FS) was obtained with the condition of the declining temperature and accelerating strain rate. The interpass fractional softening was decreased at lower temperature and its range was determined to be 50∼110%. Dynamic precipitation was observed during multipass deformation where the size and distribution of precipitates increased and spreaded as the number of rolling pass increased. The size or distribution of precipitates could be reduced by controlling the deformation condition and the area fraction of precipitates after deformation of Invar alloy was 0.3∼0.9% and its size was 2.5㎛∼3.9㎛. |