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采用示被冲击试验及预制疲劳裂纹Charpy试样,通过几种不同的单试样(或多试样)试验方法对核压力容器用A508CL3钢的动态断裂韧性进行了评定,比较了各种方法的优缺点.研究结果表明:最大载荷能量法过高地评定了材料的动态断裂韧性值(特别是在常温以上温度时);而柔度变化率法的评定值则过低,断口延伸带宽度测试法的评定结果具有较大误差,且试验过程复杂,成本较高;能量修正法是一种方便而精确的评定核压力容器钢动态断裂韧性的单试样方法;研究还表明,虽然动态阻力曲线试验法可获得最为精确的动态断裂韧性的临界值,但所需的试样数量较多,用作核压力容器钢的中子辐射脆化动态断裂韧性监测是不合适的.
The dynamic fracture toughness of A508CL3 steel for nuclear pressure vessel was evaluated by several different single-sample (or multi-sample) test methods using impact test and prefabricated fatigue cracked Charpy specimens. Comparisons of various methods The results show that: the maximum load energy method is too high to assess the dynamic fracture toughness value of the material (especially at room temperature above); while the rate of change of compliance assessment value is too low, the fracture extension band width test The test results are complicated and the cost is high. The energy correction method is a simple and accurate single sample method to evaluate the dynamic fracture toughness of nuclear pressure vessel steel. The study also shows that although the dynamic resistance curve test Method can obtain the most accurate critical value of dynamic fracture toughness, but the required number of samples is more. It is not suitable to use as the neutron radiation embrittlement dynamic fracture toughness monitoring of nuclear pressure vessel steel.