On the change of fracture mechanism with test temperature

S.R. Yu; Z.G. Yan; R. Cao

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On the change of fracture mechanism with test temperature

机译：断裂机理随试验温度的变化

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Three point bending (3PB) tests of precracked specimens were carried out for coarse grain C-Mn steel at three low temperatures. Details of fracture surfaces in the specimens were microscopically observed and cleavage initiation sites were located. Calculations of local critical parameters and simulations 'of fracture behavior were made using finite element method (FEM). The results reveal that at very low temperature (-196 deg C), the critical event controlling cleavage fracture is the nucleation of crack at the precrack tip in ferrite. The critical event moves to the initiation and propagation, of a second phase particle crack at moderately low temperature (-110 deg C). At higher temperature (-30 deg C), the critical event for cleavage fracture after a fibrous crack extends is the propagation of a grain-sized crack.

机译：在三个低温下对粗晶粒C-Mn钢进行了预裂纹试样的三点弯曲（3PB）测试。在显微镜下观察标本中断裂表面的细节，并确定了裂解起始位点。使用有限元方法（FEM）进行局部关键参数的计算和断裂行为的模拟。结果表明，在非常低的温度（-196摄氏度）下，控制解理断裂的关键事件是铁素体中裂纹前尖端处的形核。临界事件移至中等温度（-110摄氏度）下第二相颗粒裂纹的萌生和扩展。在较高的温度（-30摄氏度）下，纤维状裂纹扩展后发生开裂的关键事件是晶粒尺寸裂纹的扩展。

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《Engineering Fracture Mechanics》 |2006年第3期|共17页
作者
S.R. Yu; Z.G. Yan; R. Cao;
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正文语种 eng
中图分类工程力学;
关键词
C-Mn steel; Test temperature; Fracture mechanism;

机译：碳锰钢;测试温度;断裂机理;

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On the change of fracture mechanism with test temperature

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