| On Grain Size Dependence of Minimum Creep Rate |
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| 作者姓名： | 李培恩 |
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| 作者单位： | Institute of |
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| 摘 要： | The available experimental results have beensummarized concerning the effect of grain size onminimum creep rate.There are two types of creeprate-grain size relations.One is that there is a criti-cal grain size above which creep rate is independentof grain size,below which creep rate increases withthe decrease of grain size.The other is that there isan intermediate grain size at which creep resistanceis optimum.The first relation usually occurs athigher temperatures(>0.5 T_m),and intermediatestress ranges,while the second relation at interme-diate temperature ranges(0.4-0.5 T_m)and higherstresses.For the two types of creep rate-grain sizerelations,the increase of the creep rates with the de-crease of grain size for small grain sizes is all due tograin boundary sliding.For large grain sizes,a dis-location climb mechanism is dominant in creepdeformation for the first relation,while aHall-Perch grain boundary strengthening effect isbelieved to play an important role by dislocationglide mechanism for the second relation.
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| 收稿时间： | 1992-03-28 |
On Grain Size Dependence of Minimum Creep Rate |
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| LI Pei''en Institute of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai,China To whom correspondence should be addressed..On Grain Size Dependence of Minimum Creep Rate[J].Journal of Materials Science & Technology,1992,8(2):119-122. |
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| Authors: | LI Pei'en Institute of Materials Science and Engineering Shanghai Jiaotong University Shanghai China To whom correspondence should be addressed |
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| Abstract: | The available experimental results have been summarized concerning the effect of grain size on minimum creep rate.There are two types of creep rate-grain size relations.One is that there is a criti- cal grain size above which creep rate is independent of grain size,below which creep rate increases with the decrease of grain size.The other is that there is an intermediate grain size at which creep resistance is optimum.The first relation usually occurs at higher temperatures(>0.5 T_m),and intermediate stress ranges,while the second relation at interme- diate temperature ranges(0.4-0.5 T_m)and higher stresses.For the two types of creep rate-grain size relations,the increase of the creep rates with the de- crease of grain size for small grain sizes is all due to grain boundary sliding.For large grain sizes,a dis- location climb mechanism is dominant in creep deformation for the first relation,while a Hall-Perch grain boundary strengthening effect is believed to play an important role by dislocation glide mechanism for the second relation. |
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| Keywords: | grain size creep |
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