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通过卡贝V型和梅氏U型缺口试件温度系列示波冲击试验,对15MnVNq钢厚板抗冲击性能有了进一步的认识。示波分析试验,能清楚了解材料抵抗裂纹扩展导致脆断的撕裂功a_(s1)值的大小。对应FATT(50％)标准,本试板,在垂直轧向取样试件撕裂功值约为2.1kg—m/cm~2,约占冲击功a_k值的34％。在顺轧向取样试件撕裂功值约为5.5kg—m/cm~2,约占冲击功a_k值的49％(试件切口与取样方向垂直)。了解到,在同一轧制方向梅氏U型缺口试件冲击功a_k值高于卡贝V型缺口试件,主要是由于U型缺口试件耗于形成裂纹的弹塑性功a_T—s值大于V型缺口斌件的弹塑性功,两种缺口型式试件的撕裂功能接近相等,试验表明,不论以FATT(50％)或FATT(30％)标准,还是以冲击功a_k—温度关系曲线转变区段的中点或下平台与转变区段的切点为转脆温度标准,本试板在顺轧向取样卡贝V型缺口试件和垂直轧向取样梅氏U型缺口试件的转脆温度是基本接近的。
The impact resistance of 15MnVNq steel plate has been further recognized through the oscillometric impact test of Cabernet V-Type and Mehmet U-Notched Specimens. The oscillometric analysis test clearly shows the magnitude of a_ (s1) value of the tearing work of brittle fracture caused by the material resisting the crack propagation. Corresponding to the FATT (50%) standard, the tearing power value of the test sample in the vertical rolling sample specimen is about 2.1kg-m / cm ~ 2, accounting for about 34% of the impact energy a_k value. The tearing power value of specimen in Shun rolling is about 5.5kg-m / cm ~ 2, accounting for 49% of the value of a_k of impact work (the notch of specimen is perpendicular to the direction of sampling). It is understood that the value of ak of impact energy of Mehs U-notch specimen in the same direction of rolling is higher than that of Kappa V-notch specimen, which is mainly due to the fact that the value of a_T-s of the elastic-plastic work of crack- V-shaped notch bing pieces of the elastic-plastic work, the two notch type specimen tearing similar to the test results show that, regardless of FATT (50%) or FATT (30%) standards, or impact energy a_k-temperature curve The midpoint of the transition section or the cut point between the lower platform and the transition section is the transition temperature standard. In the forward rolling direction, the test sample is taken in the Cabernet V-notch specimen and the vertical-rolled Sampling Mehs U-notch specimen Turn crisp temperature is basically close.