Influence of hydrogen content on fracture toughness of CWSR Zr-2.5Nb pressure tube alloy
Influence of hydrogen content on fracture toughness of CWSR Zr-2.5Nb pressure tube alloy
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DOI：
10.1016/j.jnucmat.2012.07.046
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发表时间：
2013
影响因子：
3.1
通讯作者：
Ripandeep Singh;A. Bind;N. Srinivasan;P. Ståhle
中科院分区：
文献类型：
--
作者：
Ripandeep Singh;A. Bind;N. Srinivasan;P. Ståhle
本文研究了氢和温度对印度重水堆用未辐照、冷加工和应力消除（CWSR） Zr-2.5Nb压力管合金断裂韧性参数的影响。采用充气充氢管截面加工的17mm宽弯曲致密拉伸试样进行断裂韧性试验。样品的金相分析表明，氢化物主要沿管的轴向-周向面取向。断裂韧性测试按照ASTM标准E-1820-06在30-300°C的温度范围内进行，裂纹长度采用直流电位降（DCPD）技术测量。测定了断裂韧性参数JQ、jmax和dJ/da。采用数值方法确定了突变破坏的临界裂纹长度。观察到，在给定的测试温度下，代表裂纹起裂（JQ）和裂纹扩展（JMax和dJ/da）的断裂韧性参数几乎不受氢含量的影响。同时，在含氢量一定的情况下，上述断裂韧性参数均随温度升高而趋于饱和。
In this work, influence of hydrogen and temperature on the fracture toughness parameters of unirradiated, cold worked and stress relieved (CWSR) Zr–2.5Nb pressure tube alloys used in Indian Pressurized Heavy Water Reactor is reported. The fracture toughness tests were carried out using 17mm width curved compact tension specimens machined from gaseously hydrogen charged tube-sections. Metallography of the samples revealed that hydrides were predominantly oriented along axial–circumferential plane of the tube. Fracture toughness tests were carried out in the temperature range of 30–300°C as per ASTM standard E-1820-06, with the crack length measured using direct current potential drop (DCPD) technique. The fracture toughness parameters (JQ, JMaxand dJ/da), were determined. The critical crack length (CCL) for catastrophic failure was determined using a numerical method. It was observed that for a given test temperature, the fracture toughness parameters representing crack initiation (JQ) and crack propagation (JMax, and dJ/da) is practically unaffected by hydrogen content. Also, for given hydrogen content, all the aforementioned fracture toughness parameters increased with temperature to a saturation value.