本文试图探讨准解理断裂的本质。联系多晶材料的典型应力一应变曲线,对不同钢的断裂韧度试样的断口分析表明,准解理断裂可以看作是一种过渡的断裂机制。首先,一系列微观解理裂纹在高拉伸应力集中地方生核,然后这些裂纹各自沿着它本身已变形晶粒的解理面上扩展,最后借助于微观塑性聚合方式,这些微裂纹彼此连接。根据上述断裂模型可以认为:解理裂纹与塑性变形间的相互作用是准解理断裂的一种重要性质。借助于断口定量分析方法,有可能把断口形貌和一些力学参数间关系建立起来。
The quasi-cleavage fracture has been studied in conjunction with the stressstrain behaviour of steel specimens. Consideration of the results obtained on dif-ferent varieties of steel indicate that the quasi-cleavage fracture may be interpretedin terms of certain transition fracture mechanism as follows: Microcleavage cracks are nucleated at certain places of high tensile strss con-centration, subsequently each of them propagates along the cleavage plane in grainsalready deformed and finally they merge together by microplastic coalescence.According to the above conception, the interaction between the cleavage crack andthe plastic deformation may be regarded as the most important characteristics ofquasi-cleavage fractures. Using quantitative fractography, correlation between thefractographic features of specimens and the parameters of its certain mechanicalproperties may be established.
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