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图4. 不同工艺和冲击温度试样的示波冲击位移-载荷和位移-吸收能量曲线

Fig.4. Load and impact energy versus displacement curves of samples at different heat treatment and impact temperature (a) T620 and T640 at -40℃; (b) T620 and T640 at -20℃; (c) T620 and T640 at 20℃ and (d) T640 at -40℃, -20℃ and 20℃