Research Article
Research on Fatigue Damage in High-Strength Steel (FV520B) Using Nonlinear Ultrasonic Testing
Figure 15
Microstructure of notched specimens (550 MPa stress concentration). (a) Microstructure of 1.00 × 105 cycles. (b) Microstructure of 2.50 × 105 cycles. (c) Microstructure of 2.75 × 105 cycles.
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