基于W型试样确定A508-Ⅲ钢参考温度T_(0)的方法研究

Test Method for T_(0) of Domestic A508-ⅢSteel by Using W-shaped Specimen

在我国早期开发的W型试样的基础上,参考ASTM E1921标准,开发了基于W型试样的断裂韧性测试技术,建立了包括断裂韧性计算、数据有效性判定和参考温度T_(0)计算等在内的数据分析方法。在-100~-40℃下开展了国产A508-Ⅲ钢的W型试样和标准1C(T)试样的测试分析和试验数据的有效性评价。结果表明,基于W型试样可得到满足ASTM E1921标准的有效断裂韧性数据,W型试样数据点均在标准1C(T)试样master curve(主曲线)的置信区间内,基于W型试样确定的参考温度T_(0)与标准1C(T)试样的非常接近,W型试样可成为RPV辐照监督备选试样。

A new type of W-shaped specimen for determining T_(0) was designed based on the W-shaped specimen developed earlier in China.The test technology of W-shaped specimen for T_(0) measurement was established,and the data analysis methods including fracture toughness calculation,datum censoring and reference temperature T_(0) calculation of W-shaped specimen were determined,after referring to ASTM E1921 standard.Finally,W-shaped specimen and 1 C(T)specimens of domestic A508-Ⅲsteel were tested at-100--40℃,the results were used to validate the effectiveness of the W-shaped specimen test data.The results show that effective fracture toughness data determined by ASTM E1921 can be obtained based on the W-shaped specimen.The test data of W-shaped specimens are all within the confidence interval of the master curve determined by 1 C(T)specimen.T_(0) determined by the W-shaped specimen is very close to that of standard 1 C(T)specimen.The W-shaped specimen can be applied as the candidate fracture toughness specimen of RPV surveillance program.