利用透射电镜(TEM)对不同蠕变态的马氏体Cr钢亚晶结构进行了定量表征,得到了不同蠕变态的亚晶尺寸分布曲线,分析了蠕变过程中亚晶结构的变化特征,以及这些变化对显微硬度的影响。结果表明:高应力蠕变,亚晶粗化较小,而低应力蠕变,亚晶粗化显著;蠕变态的亚晶尺寸与硬度之间满足Hall-Petch关系,亚晶粗化引起硬度下降。
Abstract
Quantitative characterization of the martensitic Cr steel subgrain was conducted by TEM under different crept states.The crept subgrain’size distribution and their microstructure,as well as their effects on the microhardness were investigated.The results show that the subgrain of the martensitic Cr steel are coarsened under high stress creep,and more coarsened under low stress creep.The coarsened subgrain structure in the crept steel decreased their microhardness and their relationship obeyed the Hall-Petch formula.
关键词
马氏体Cr钢 /
蠕变 /
亚晶结构 /
定量表征
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Key words
martensitic Cr steel /
creep /
subgrain structure /
quantitative charact
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参考文献
EGGELER G,NILSVGNG N,ILSCHNER B.Microstructural changes in a 12% chromium steel during creep[J].Steel Research,1987,58(2):97-103.
STRAUB S,HENNIGE T,POLCIK P,et al.Microstructure and deformation rate during long-term cyclic creep of the martensitic steel X22CrMoV12-1[J].Steel Research,1995,66(9):394-401.
POLICIK P,SAILER T,BLUM W,et al.On the microstructural development of the tempered martensitic Cr-steel P 91 during long-term creep-a comparison of data[J].Mater Sci Eng(A),1999,260(1-2):252-259.
STRAUB S,POLCIK P,BESIGK W,et al.Microstructural evolution of the martensitic cast steel GX12CrMoVNbN9-1 during long-term annealing and creep[J].Steel Research,1995,66(9),402-408.
QIN Y,GOTZ G,BLUM W,et al.Determination of size distribution of precipitates in the cast martensitic steel G-X12CrMoWVNbN 10-1-1 by direct and indirect method[J].Journal of Alloys and Compounds,2003,352(1-2):260-264.
ORLOVA A,BURSIK J,KUCHAROVA K,et al.Microstructural development during high temperature creep of 9% Cr steel[J].Mater Sci Eng(A),1998,245 (1):39-48.
ORLOV? A.On the applied stress dependence of the subgrain size[J].Mater Sci Eng (A),1996,220(1),117-122.
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脚注
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基金
航空科学基金(2007ZF56014)
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