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研究了固溶处理AL6XN超级奥氏体钢在温度773～973K以及3.3×10-5～3.3×10-3s-1应变速率范围的高温拉伸力学行为。结果表明,AL6XN奥氏体钢在以上实验条件下(不包括873K,3.3×10-5s-1)均存在动态应变时效,具体表现为在真应力-真应变曲线上出现锯齿形,同时屈服强度在773～973K范围呈现平台区;临界应变量随着温度从773K升高到923K逐渐降低,并且在此温度范围激活能为304kJ/mol,说明动态应变时效的机制为AL6XN奥氏体钢中Cr和Mo等置换原子与位错的交互作用。透射电镜分析同时表明AL6XN奥氏体钢形变后位错结构呈平面滑移特征。
The tensile mechanical behavior of AL6XN super austenitic steel at elevated temperature (773 ~ 973K) and strain rate of 3.3 × 10-5 ~ 3.3 × 10-3s-1 was studied. The results show that the dynamic strain aging of AL6XN austenitic steel under the above experimental conditions (excluding 873K, 3.3 × 10-5s-1) is manifested in the appearance of zigzag on the true stress-true strain curve and the yield strength The plateau region appears in the range of 773 ~ 973K; the critical strain decreases gradually with the increase of temperature from 773K to 923K, and the activation energy in this temperature range is 304kJ / mol, indicating that the mechanism of dynamic strain aging is Cr And Mo and other replacement atoms and dislocation interaction. Transmission electron microscopy analysis also shows that the deformation structure of AL6XN austenitic steel shows a plane slip characteristic.