分别研究了中国自主研发的2种低活化铁索体/马氏体钢(CLAM钢和CLF-1钢)中氘的驻留情况,利用金相显微镜对材料的金相组织进行分析.结果表明,CLAM钢为等轴的回火马氏体相,而CLF-1钢金相组织为保持了板条马氏体形态的细小回火马氏体.通过氘的扩散常数计算2种钢中氘浓度分布,结果显示,CLAM钢和CLF-1钢在500℃、500 kPa条件下,氘充饱和情况下氘浓度分别为7.43 μg/g和5.7μg/g.在室温下放置0.5h后,CLAM钢和CLF-1钢中的氘分别损失了23％和51％.TDS实验结果表明,CLAM钢中的氘只有1个解吸峰,激活能为21 kJ/mol,对应的氢陷阱为晶界和位错.CLF-1钢中的氘有2个解吸峰,解吸峰激活能为31 kJ/mol,高温段解吸峰激活能为94 kJ/mol.2种钢中低温段解吸峰对应的氢陷阱为晶界和位错,CLF-1钢低温段解吸峰的激活能略高是因为其晶粒尺寸小,氘原子的扩散路径更多.CLF-1钢样品高温段解吸峰对应的氢陷阱是由晶界和位错等缺陷与MC碳化物复合形成的新的氢陷阱.
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