材料期刊网

氚自射线照相法是观察低含量氢微观分布的有效手段之一。本工作利用氚示踪法研究:1.在不同纯度Fe中氢的分布规律;2.在局部应力状态下氢的扩散行为;3.在液相烧结钨合金中氢的分布;4.氢在堆焊接头不同区域的分布特征。实验结果表明,氢的分布特性与相结构、应力状态和碳陷阱有关。

Tritium autoradiography was employed for the identification of: 1. the hydrogen distribution in irons with different purities; 2. the diffusion behavior uof hydrogen in metal under local load for different stress stand; 3. the distribution of tritium in the W alloys, 95%W-3.5%Ni-1.5%Fe, a kind of two-phase alloys consisted from W particles and binder of solution 54.2%Ni-27.1%Fe-20.5%W with high specific gravity and 4. the hydrogen distribution of different zones for the weld joint. It was found that the hydrogen distribution of iron is dependent on the purity of iron and the hydrogen solubility in the iron, however, grain boundary of high purity iron cannot be provided preferred sites for hydrogen accumulation site, but grain orientation difference is sensitive for tritium tracer. Tritium redistribution of hydrogen in different purity iron under different plastic deformation by the stress induced hydrogen segregation on the iron. Tritium distribution on the W-Ni-Fe sintcring alloys, even without etching, it is primarily accumulated on the interface of binding phase, which is dependent on relative solubility in two-phase alloys. The distribution of tritium on the different zone of the weld joint shows that hydrogen in the austenite weld, fusion zone. Overheat affected zone of matrix and matrix is different, which is closely connection of the carbon segregation of weld process and structure defect of matrix.