and fine. The as-received DSS has coarse grain microstructure with
elongated and longitudinal shape. Meanwhile, fine equiaxed grain
microstructure with an average grain size of 3 μm was obtained
from the thermo-mechanically treated DSS. Thermo-mechanical
treatment was conducted by solution-treating the as-received DSS
at 1573 for 1 h, followed by water-quenching. The specimen was
then cold-rolled to a plate through a reduction area of 75%. All specimens
were cut from the as-received and thermo-mechanically treated
DSS to a dimension of (10×10×8) mm.