材料科学
延展性(地球科学)
微观结构
断口学
极限抗拉强度
铸造
冶金
金相学
石墨
断裂(地质)
拉伸试验
复合材料
蠕动
作者
V. Vokál,Nilsson Karl-Fredrik,Philip Minnebo
标识
DOI:10.1179/174651008x309097
摘要
This paper describes a study to correlate the variation in ductility in ductile cast iron to casting defects and cast iron's microstructure. A large set of tensile and fracture specimens taken from three inserts for the Swedish KBS-3 programme were tested. About half the tensile specimens were analysed by metallography and fractography to identify and size defects and microstructural variations. It was found that the elongation at fracture was reduced by casting defects in the form of magnesium–oxide films and to a lesser extent by the graphite properties. An elastic–plastic probabilistic fracture mechanics model that relates the variation in ductility to the size and shape of casting defects is presented. The agreement between computed and measured results is quite good.
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