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通过理论计算确定氢离子辐照下武钢产SA738Gr.B钢位移损伤峰值的深度,对不同剂量辐照(0.2、0.5、1.0dpa)前后微观组织的特征和元素分布情况进行分析,判定离子辐照对SA738Gr.B钢的显微组织的影响。结果表明,通过高倍TEM观察以及STEM技术的分析,在SA738Gr.B钢基体中并未发现氢泡和大尺寸空位团,氢离子辐照下材料肿胀很小。通过对比0.5dpa位移损伤量的微观组织与1.0dpa位移损伤量的微观组织,可以明显看出,位移损伤量低的SA738Gr.B钢中的位错密度、位错环数量都大大降低。随着辐照剂量的提高,钢中位错密度和位错环数逐步增多,可以初步判定钢的辐照硬化效应程度。
The depth of displacement injury peak of SA738Gr.B steel under hydrogen ion irradiation was determined by theoretical calculation. The characteristics and elemental distribution of microstructure before and after exposure to different doses of radiation (0.2, 0.5 and 1.0 dpa) were analyzed to determine the effect of ionizing radiation Effect on Microstructure of SA738Gr.B Steel. The results show that by means of high-power TEM observation and STEM analysis, no hydrogen bubbles and large vacancy groups are found in the SA738Gr.B steel matrix, and the material swelling under hydrogen ion irradiation is small. By comparing the microstructure of the 0.5dpa displacement damage microstructure with the 1.0dpa displacement damage microstructure, it can be clearly seen that the dislocation density and the number of dislocation loops in SA738Gr.B steel with low displacement damage are greatly reduced. With the increase of irradiation dose, the dislocation density and the number of dislocations in steel increase gradually, and the degree of irradiation hardening effect of steel can be preliminarily determined.