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首页> 外文会议>Asian Pacific conference for fracture and strength'99 (APCFS'99) >A Crystallographic Examination of Fracture Mechanisms in Low Cycle Fatigue of Pure Iron at Low Temperature
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A Crystallographic Examination of Fracture Mechanisms in Low Cycle Fatigue of Pure Iron at Low Temperature

机译：低温下纯铁低周疲劳断裂机理的晶体学检查

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摘要

Low cycle fatigue tests were performed atrn-140℃ using a commercial grade pure ironrnwith average ferrite grain size of 400μm. Arncrystallographic examination of deformationrntwins around the fracture origination sites hasrnbeen carried out, based on detailed observationrnof fracture surfaces using scanning electronrnmicroscope. For all the observed internalrnfracture modes where internal cracks initiate atrnthe sites of (i) the intersection of a deformationrntwin and a grain boundary (T-B type), (ii) thernintersection of deformation twins (T-T type)rnand (iii) the intersection of a deformation twinrnand an inclusion (T-I type), the deformationrntwins which result in the final fracture ofrnspecimens belong to the {112} twinning grouprnas defined in this paper. In the case of T-T type,rn{001} cleavage fracture results from thernintersection of deformation twins belonging tornthe {112} twinning group with <021>rnintersection line.
机译：使用商品级纯铁氧体平均粒径为400μm的纯铁在140℃进行低循环疲劳试验。基于扫描电镜对断口表面的详细观察，对断口周围的变形双绞线进行了晶体学检查。对于所有观察到的内部裂纹在内部裂纹产生于以下位置的断裂模式：（i）变形孪晶与晶界的交点（TB型），（ii）变形孪晶的交点（TT型）rn和（iii）变形交点孪晶和一个夹杂物（TI型），导致试样最终断裂的形变孪晶属于本文定义的{112}孪晶族。在T-T型的情况下，rn {001}的断裂断裂是由属于{112}孪生组的变形双胞胎的相交线以<021>相交线引起的。

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