Cleavage initiation mechanism in notched specimens of steel with carbides and inclusions

	Cleavage initiation mechanism in notched specimens of steel with carbides and inclusions
	Wang, G.Z.; Chen, J.H.
	2005
会议名称	11th International Conference on Fracture 2005, ICF11
会议录名称	11th International Conference on Fracture 2005, ICF11
卷号	6
页码	4217-4222
会议日期	March 20, 2005 - March 25, 2005
会议地点	Turin, Italy
出版者	International Congress on Fracture
摘要	Cleavage initiation mechanism in notched specimens of steel with carbides and inclusions is investigated at -196 °C and -130 °C. The mechanical tests, microscopic observations and measurements, and FEM calculations are carried out. Two types of cleavage initiation sites are found. One is related to approximately spherical inclusions ahead of notch root (IC initiation), the other is related to spherical inclusions situated ahead of elongated larger string inclusions (SIC initiation). In both IC and SIC initiation mechanism, the crack nucleation is induced by inclusions and the final fracture is controlled by propagation of a ferrite grain-sized crack into matrix grain. In the case of SIC initiation, a plate-like defect caused by the early debonding of the elongated larger string inclusions promotes the cleavage fracture, and the cleavage initiates in front of the plate-like defect. Temperature has pronounced effect on the type of the cleavage initiation site. At -196 °C the fractures are mainly the IC initiation mechanism, and at -130 °C all the fractures are the SIC initiation mechanism. The reason for this has been analyzed. The notch toughness of the steels tested is mainly determined by the cleavage initiation occurring in the weak constituents composed of inclusions and matrix grains, and is independent on the sizes and numbers of carbide particles.
关键词	Carbides Fracture Integrated circuits Carbide particles Cleavage fracture Crack nucleation Initiation mechanism Initiation sites Microscopic observations Notched specimens Spherical inclusion
收录类别	EI
语种	英语
EI入藏号	20124815728200
EI主题词	Cracks
来源库	Compendex
分类代码	714.2 Semiconductor Devices and Integrated Circuits - 804.2 Inorganic Compounds - 951 Materials Science
文献类型	会议论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/117156
专题	材料科学与工程学院_特聘教授组
作者单位	State Key Laboratory of New Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
第一作者单位	兰州理工大学
推荐引用方式 GB/T 7714	Wang, G.Z.,Chen, J.H.. Cleavage initiation mechanism in notched specimens of steel with carbides and inclusions[C]:International Congress on Fracture,2005:4217-4222.