图2. 760 ℃长期时效后Ni-Cr-W-Fe合金的SEM像
Fig.2. SEM images of Ni-Cr-W-Fe alloys after aging at 760 ℃ for 200 h (a), 500 h (b), 1000 h (c), 2000 h (d) and 3000 h (e)