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

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	Cleavage initiation mechanism in notched specimens of steel with carbides and inclusions
	Wang, G.Z.; Chen, J.H.
	2005
会议日期	March 20, 2005 - March 25, 2005
会议地点	Turin, Italy
关键词	Carbides Fracture Integrated circuits Carbide particles Cleavage fracture Crack nucleation Initiation mechanism Initiation sites Microscopic observations Notched specimens Spherical inclusion
卷号	6
页码	4217-4222
英文摘要	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.
会议录	11th International Conference on Fracture 2005, ICF11
会议录出版者	International Congress on Fracture
语种	英语
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/117156]
专题	兰州理工大学
作者单位	State Key Laboratory of New Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
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]. 见:. Turin, Italy. March 20, 2005 - March 25, 2005.