Table 2.

Various homogenization heat treatment principles.

NO.	Heat Treatment Parameters	Position
P1	420 °C/5 h + 480 °C/8 h + 510 °C/24 h, air cooling	D/2, D/4, Skin layer
P2	420 °C/5 h + 480 °C/8 h + 510 °C/24 h, water quenching	D/4
P3	420 °C/5 h + 480 °C/8 h + 515 °C/24 h, water quenching
P4	420 °C/5 h + 480 °C/8 h + 515 °C/48 h, water quenching
P5	420 °C/5 h + 480 °C/8 h + 520 °C/24 h, water quenching