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GRAIN BOUNDARY FEATURE AND CREEP BEHAVIOR OF Fe-15Cr-25Ni ALLOYS

ZHANG Junshan CHEN Weixing CAO Zhiben Dalian University of Technology , Dalian , China Associate Professor , Department of Materials Engineering , Dalian University of Technology , Dalian , China

金属学报(英文版)

Creep behavior of Fe-15Cr-25Ni alloys with different grain boundary features has been in- vestigated at 850 and 950℃ and in stress range of 14.7~78.5 MPa.The single phase alloy exhibits typical recovery creep characteristics,and for the alloy in which M_(23)C_6 carbides densely precipitate at grain boundaries,the creep rate dramatically decreases and creep behav- ior is also significantly different from the single phase alloy.When the carbides precipitate at grain boundaries,the dislocation density are higher and the size of subgrains near grain boundaries are smaller than those of single phase alloy.The creep mechanisms for two grain boundary features have been discussed.

关键词: grain boundary feature , null , null

Fe-15Cr-25Ni合金晶界特征与蠕变行为

张俊善 , 陈卫星 , 曹智本

金属学报

在两种不同晶界状态下研究了Fe-15Cr-25Ni合金蠕变行为。单相合金表现出典型的回复蠕变行为,而在晶界上密集析出碳化物时蠕变速度大大降低,蠕变规律也和单相合金明显不同。沿晶界析出密集排列的碳化物时,晶界附近位错密度高,亚晶细小。对两种晶界状态下的蠕变机制进行了讨论。

关键词: 晶界特征 , recovery creep , dislocation annihilation

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