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CUN常规冲击试验方法对300M钢冲击韧性进行测试,发现回火马氏体脆性的新特点,即在350～550℃之间发生通常的回火马氏体脆性(定义为韧性“深谷区”)之前的200～300℃温度范围内出现了一个较浅的韧性低谷(定义为韧性“浅谷区”)。针对这两个脆性区进行CVN示波冲击试验,了解了300M钢动态断裂过程的能量消耗,并指出“浅谷区”和“深谷区”的形成都与解理断裂抗力有直接联系,“浅谷区”为沿板条界解理断裂,“深谷区”为穿条解理断裂。
CUN conventional impact test method for the impact toughness of 300M steel was tested and found that the new characteristics of tempered martensite brittleness, that is, the normal tempering martensite brittleness (defined as toughness “deep valley ”), A shallow ductile trough (defined as toughness,“ shallow valley ”) appeared in the temperature range of 200-300 ° C. The CVN oscillometric impact tests were conducted on the two brittle zones to understand the energy consumption of the dynamic fracture process of 300M steel. It was also pointed out that the formation of “shallow valley ” and “deep valley ” are directly related to the cleavage fracture resistance , “Shallow valley” cleavage fracture along the slab boundary, “deep valley ” to wear bar cleavage fracture.