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研究了500℃高温条件下注氢对V-4Cr、V-4Ti和V-4Cr-4Ti三种合金微观结构的影响.在注氢实验之前,V-4Cr合金的基体清晰干净,而V-4Ti和V-4Cr-4Ti两种合金的基体中则出现很多相互平行和垂直的针状析出相,且大部分析出相周围都存在着位错.在500℃注氢实验之后,V-4Cr合金基体中出现大量的分布不均的黑色点状缺陷和缺陷簇,而V-4Ti和V-4Cr-4Ti两种合金的基体中除产生点状缺陷外,还出现高密度的气泡,且V-4Cr-4Ti合金中气泡的平均尺寸要稍小一些.另外,V-4Ti和V-4Cr-4Ti合金基体中原有的析出相在注氢实验之后都发生不同程度的溶解.在观察V-4Cr-4Ti合金基体中气泡分布规律时发现,在距离晶界25 nm的范围内几乎看不到气泡的存在,由此推断晶界的存在可以抑制氢气泡等辐照缺陷的产生.
The effect of hydrogen injection on the microstructure of V-4Cr, V-4Ti and V-4Cr-4Ti alloys was investigated at 500 ℃. The matrix of V-4Cr alloy was clear and clean before the hydrogen injection experiment. The V-4Ti And V-4Cr-4Ti two kinds of alloy matrix appeared a lot of parallel and vertical needle-like precipitation phase, and most of the precipitation around the presence of dislocations.After 500 ℃ hydrogen injection experiment, the V-4Cr alloy A large number of black spot-like defects and defect clusters with uneven distribution appeared in the matrix, and high-density bubbles were found in the matrix of the two alloys of V-4Ti and V-4Cr-4Ti. V- The average size of the bubbles in the 4Cr-4Ti alloy is slightly smaller.In addition, the original precipitates in the V-4Ti and V-4Cr-4Ti alloy matrix dissolve to some extent after the hydrogen injection experiment.When the V-4Cr- 4Ti alloy matrix found that the bubble in the range of 25 nm from the grain boundary almost no presence of bubbles, infer that the presence of grain boundaries can inhibit hydrogen bubbles and other radiation defects.