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首页> 外文会议>20th International Symposium on Effects of Radiation on Materials, Jun 6-8, 2000, Williamsburg, Virginia >Master Curve Characterization of Irradiation Embrittlement Using Standard and 1/3-Sized Precracked Charpy Specimens
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Master Curve Characterization of Irradiation Embrittlement Using Standard and 1/3-Sized Precracked Charpy Specimens

机译：使用标准尺寸和1/3尺寸的预裂纹夏比试样对辐照脆化进行主曲线表征

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Cleavage initiation fracture toughness (K_(JC)) tests have been performed in the transition temperature ranges of five different heats of reactor pressure vessel steels. The main purpose of this study is to investigate the applicability of the ASTM Standard Test Method for Determination of Reference Temperature, T_O, for Ferritic Steels in the Transition Range (El921-97) to small specimens available in normal surveillance capsules. Precracked Charpy-type specimens with the standard size (10Xl0X55mm, PCVN) and 1/3-size (3.3X3.3Xl8.3mm, 1/3-PCVN) are mainly investigated. Results from more than 300 fracture toughness test data are presented including 120 unirradiated PCVN specimens and 100 unirradiated 1/3-PCVN specimens in addition to some CT specimen data and two sets of irradiated PCVN data. The test materials are the IAEA reference steels, so-called JRQ and JFL, and three Korean SA508-3 forging steels that were made by different refining processes. JRQ and a Korean steel, SKA-1, are also evaluated after neutron irradiation by PCVN specimens as well as Charpy impact tests. Fracture toughness data showed that the master curve and its probabilistic bound lines represent the population of the test data measured from different materials and specimens with good accuracy. However, there are still the effects of specimen geometry and size on the measured T_O values. These effects seem to be more significant in microscopically less homogeneous materials. Smaller bend type specimens may give slightly less conservative results than the larger CT type specimens. One of the important findings is that ultra small 1/3-PCVN specimens are also valuable as the standard size PCVN specimens for determining reference temperatures since the differences are rather systematic and predictable. The T_(28J) correlation, based on the PCVN data only, works well for the current data sets including irradiated materials.
机译：在反应堆压力容器钢的五种不同热量的转变温度范围内，进行了劈裂起始断裂韧性（K_（JC））测试。这项研究的主要目的是研究用于确定转变温度范围（El921-97）中的铁素体钢的参考温度T_O的ASTM标准测试方法对普通监视胶囊中可用的小样本的适用性。主要研究标准尺寸（10X10X55mm，PCVN）和1/3尺寸（3.3X3.3Xl8.3mm，1 / 3-PCVN）的预裂夏比型试样。给出了300多个断裂韧性测试数据的结果，除了一些CT样本数据和两组辐照的PCVN数据外，还包括120幅未辐照的PCVN样品和100幅未辐照的1 / 3-PCVN样品。测试材料是国际原子能机构的参考钢，即所谓的JRQ和JFL，以及三种韩国SA508-3锻钢，它们是通过不同的精炼工艺制成的。在PCVN标本中子辐照以及夏比冲击试验后，还对JRQ和韩国钢SKA-1进行了评估。断裂韧性数据表明，主曲线及其概率界线代表了从不同材料和样品中测得的测试数据的总体准确性。但是，样品的几何形状和尺寸仍然对测得的T_O值产生影响。这些效果在微观上较不均匀的材料中似乎更为明显。较小的弯曲型试样可能比较大的CT型试样的保守性稍差。重要发现之一是，超小型1 / 3-PCVN标本作为确定参考温度的标准尺寸PCVN标本也很有价值，因为差异相当系统且可预测。仅基于PCVN数据的T_（28J）相关性适用于当前数据集（包括辐射材料）。

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