Statistical scatter in the fracture toughness and Charpy impact energy of pearlitic steel
Statistical scatter in the fracture toughness and Charpy impact energy of pearlitic steel
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DOI：
10.1016/j.msea.2007.08.079
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发表时间：
2008-07
期刊：
影响因子：
6.4
通讯作者：
B. Strnadel;P. Haušild
中科院分区：
文献类型：
--
作者：
B. Strnadel;P. Haušild
在准静态和动态加载条件下，研究了显微组织对高碳亚共析钢断裂特性的影响。实验确定的断裂韧性和夏比冲击能值进行了统计处理。断裂韧性和夏比冲击功之间的关系。在非常脆的区域，断裂韧性随着夏比冲击功的增加而略有增加。在断裂韧性较高的区域中，断裂韧性随夏比冲击能的增加而增加的趋势更为明显。断裂的紧凑拉伸（CT）和夏比V型缺口（CVN）试样的详细的SEM检查表明，在环境温度下发生的断裂几乎完全由解理。Charpy和CT试样断裂表面上的解理刻面形态没有明显差异。断裂面的断口分析揭示了解理的形成机理。而断裂CT试样的断裂表面表现出许多解理起源，CVN试样的断裂表面通常只显示一个。
The effect of microstructure on the fracture characteristics of high carbon hypo eutectoid steel was studied under conditions of quasistatic and dynamic loading. Experimentally determined sets of fracture toughness and Charpy impact energy values were statistically treated. A relationship was found between fracture toughness and Charpy impact energy. In the very brittle domain, the fracture toughness increases slightly with increasing Charpy impact energy. In the domain where the fracture toughness is higher, the rise in fracture toughness with increasing Charpy impact energy is more pronounced. Detailed SEM examination of fractured compact tension (CT) and Charpy V-notch (CVN) specimens showed that the fracture at ambient temperature occurred almost exclusively by cleavage. There were no visible differences in the morphology of cleavage facets on the fracture surfaces of Charpy and CT specimens. Mechanisms of cleavage initiation were revealed by the fractographical investigation of fracture surfaces. Whereas the fracture surfaces of broken CT specimens exhibit a number of cleavage origins, the fracture surfaces of CVN specimens usually show only one.