Deformation-induced defects controlling fracture toughness of steel revealed by tritium desorption behaviors
Deformation-induced defects controlling fracture toughness of steel revealed by tritium desorption behaviors
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DOI：
10.1016/s1359-6454(99)00392-4
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发表时间：
2000-02
期刊：
影响因子：
9.4
通讯作者：
M. Nagumo;T. Yagi;H. Saitoh
中科院分区：
文献类型：
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作者：
M. Nagumo;T. Yagi;H. Saitoh
用氚的室温脱附和热脱附谱研究了钢在韧脆转变区的韧性裂纹扩展阻力和脆性断裂起始，揭示了塑性变形引起的缺陷。将氚作为探测缺陷的探针引入未变形或变形的样品中。三种钢，其微观结构的特点是由滑移延伸的约束因子，被采用。在室温下放置三天后，试样中的残留氚增加到与施加塑性变形时的约束因子相对应的程度。热解吸氚的峰值解吸率在150°C左右，也随着约束因子的增加而增加。参考前面的分析的R-曲线，限制跨晶界的滑移的延伸被示出为通过演变空位簇或微孔的变形微观结构来控制延性裂纹扩展阻力和脆性断裂起始。
Defects induced by plastic deformation have been revealed by means of room temperature desorption and thermal desorption spectroscopy of tritium with regards to the ductile crack growth resistance and brittle fracture initiation in steels in the ductile-to-brittle transition region. Tritium, as a probe for detecting defects, was introduced into non-deformed or deformed samples. Three steels, the microstructures of which are characterized by the constraint factor for slip extension, were employed. The residual tritium in a specimen after three days at room temperature increased to the extent corresponding to the constraint factors when plastic deformation was applied. The thermally desorbed tritium, with a peak desorption rate around 150°C, also increased according to the constraint factors. Referring to the previous analysis of the R-curves, the constraint for the extension of slip across grain boundaries is shown to control both the ductile crack growth resistance and the brittle fracture initiation through the deformation microstructures that evolve vacancy clusters or microvoids.