Research Article
Research on Fatigue Damage in High-Strength Steel (FV520B) Using Nonlinear Ultrasonic Testing
Figure 14
Microstructure of plate specimen (400 MPa loading stress). (a) Original microstructure. (b) Microstructure of 5 × 105 cycles. (c) Microstructure of 5 × 106 cycles. (d) Microstructure of 2 × 107 cycles.
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