吹砂对DD6单晶高温合金表面完整性和高周疲劳强度的影响

李嘉荣, 董建民, 韩梅, 刘世忠

Effects of Sand Blasting on Surface Integrity and High Cycle Fatigue Properties of DD6 Single Crystal Superalloy

LI Jiarong, DONG Jianmin, HAN Mei, LIU Shizhong

图8 150 μm吹砂后DD6高温合金试样760和980℃旋转弯曲高周疲劳断口附近的位错形态

Fig.8 Dislocation morphologies near high cycle fatigue fracture of DD6 superalloy specimens under rotational bending at different temperatures after sand blasting with 150 μm granularity (a) 760oC, S = 430 MPa, Nf = 7.54 × 106 cyc (b) 760oC, S = 600 MPa, Nf = 8.07 × 104 cyc (c) 980oC, S = 370 MPa, Nf = 8.71 × 106 cyc (d) 980oC, S = 700 MPa, Nf = 2.78 × 104 cyc