| 刘凌博,窦天军,王博,饶咏初,叶小球,陈长安.中国RAFM钢中驻留氘的热脱附行为研究[J].材料导报,2016,30(14):10-14 |
| 中国RAFM钢中驻留氘的热脱附行为研究 |
| Thermal Desorption Behavior of Retained Deuterium in Chinese RAFM Steel |
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| DOI：10.11896/j.issn.1005-023X.2016.14.003 |
| 中文关键词: 低活化铁素体/马氏体钢 氘 热解吸谱 |
| 英文关键词: ferritic/martenstic steels, deuterium, thermal desorption spectrum |
| 基金项目:国家自然科学基金(51471154)；国家磁约束核聚变能发展研究专项(2015GB109006) |
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| 中文摘要: |
| 分别研究了中国自主研发的2种低活化铁素体/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5.7 μg/g。在室温下放置0.5 h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。 |
| 英文摘要: |
| Deuterium retention condition in two types of reduced activation ferritic-martensitic steels(CLAM and CLF-1) was studied by the method of thermal desorption spectrum(TDS), and the metallurgical structure of the two types of steel was obtained by optical microscope.The result showed that the CLAM steel was ferritic and the CLF-1 steel was ferritic base with large amount of martensite. The grain size of CLF-1 steel was slightly smaller than that of CLAM steel. The calculating results of the deuterium diffusion coefficient in the two types of RAFM steels showed that the concentration of deuterium charged at 500 ℃, 500 kPa in CLAM steel and CLF-1 steel after saturated were 7.43 μg/g and 5.7 μg/g, respectively. After 0.5 h at room temperature, the losses of deuterium in CLAM steel and CLF-1 steel were 23% and 51%, respectively. The TDS result showed that there was only one peak for CLAM steel with activation energy of 21 kJ/mol. Moreover, there were two peaks for CLF-1 steel with activation energy of 31 kJ/mol and 94 kJ/mol, respectively. The hydrogen trap sites corresponding to the resolution peaks of the two types of steel at medium and low temperature level were grain boundary and dislocation. The activation energy of CLF-1 sample was higher than that of CLAM because of the smaller grain size and more paths for atoms to travel. The hydrogen trap sites corresponding to the resolution peak of CLF-1 at high temperature level were consisted of the compsite of grain boundary and dislocation with MC carbide. |
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