利用ＫＹＫＹ离子探针微分析仪和有限元定量计算发现，２１Ｃｒ７Ｎｉ９ＭｎＮ奥氏体钢在复合型（Ⅰ＋Ⅱ）载荷下，缺口顶端无论在开裂方向还是塑性区尺寸最大方向上，皆有两个氢浓度的富集峰，且随着Ⅱ型分量的增加，远离缺口的氢富集峰有下降且移向缺口顶端的趋势．钢中原始氢浓度的改变、并不严重影响缺口顶端双氢峰的形成。缺口前端塑性应变和静水应力的梯度分布是导致其氢浓度再分布的主要因素．据此提出了复合型载荷缺口顶端双氢峰富集模型．
Hydrogen accumulation near notch tip of austenitic steel 21Cr7Ni9MnN under Ⅰ＋Ⅱ mixed mode loading has been studied by KYKY ion microprode mass analyser (IMMA) and ADINA non─linear finite element quantitive compution. It is found that there exist two accumulation peaks of hydrogen concentration,one at notch tip and the other far apart from it,either in the cracking direction or in the maximum plastic zone. With the increasing of mode II component,the peak of hydrogen accumulation far from the notch tends to drop and move towards the notch tip. The change of the initial hydrogen concentration in the steel has no dramatical influence on the two peaks of hydrogen accumulation near the notch tip. The redistribution of hydrogen concentration is caused mainly by the gradient distribution of plastic strain and hydrostatic stress near the notch tip.Correspondent：CHEN Lian, Professor,Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
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