Fracture behaviour of 8%Ni 980 MPa high strength steel at various temperatures Part 2 - COD tests

doi:10.1179/174328409X439169

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	Fracture behaviour of 8%Ni 980 MPa high strength steel at various temperatures Part 2 - COD tests
	Cao, R.1,2; Yan, Y. J.1,2; Du, W. S.3; Tian, Z. L.3; Peng, Y.3; Chen, J. H.1,2
刊名	Materials Science and Technology
	2011
卷号	27 期号:1 页码:145-155
关键词	Bainite Cracks Fracture Fracture mechanics Grain boundaries Steel testing Temperature Austenite grain boundaries Crack configuration Crack opening displacements Effects of temperature Fracture behaviour Fracture mechanisms Microscopic observations of fracture Very low temperatures
ISSN号	02670836
DOI	10.1179/174328409X439169
英文摘要	The fracture behaviour of 8%Ni 980 MPa grade high strength steel is investigated by combining experimental results of crack opening displacement (COD) tests at various temperatures with detailed microscopic observations of fracture surfaces and crack configurations in unloaded specimens. The results reveal that this high strength steel possesses high toughness with a transition temperature around -150°C. Even though at a very low temperature (-196°C), cleavage cracking dominates the fracture process and the crack does not propagate immediately through the entire ligament: a 'pop-in' extension is observed in macroscopic tests, and the microscopic fracture mode is quasi-cleavage. It is found that resistance to crack propagation is provided by three barriers: original austenite grain boundaries, bainite colony boundaries and interlayers between bainite laths. These barriers manifest themselves by tear ridges with dimples on the fracture surfaces. At higher temperatures, the fracture mechanism is dominated by fibrous rupture, associated with a 'dimpled' fracture surface and some individual quasi-cleavage facets. © 2011 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute.
资助项目	Foundation for Doctorate of Education Ministry[20060731001]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Maney Publishing
WOS记录号	WOS:000285870400026
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111561]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
通讯作者	Cao, R.
作者单位	1.Lanzhou Univ Technol, Minist Educ, Key Lab Nonferrous Met Alloys, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China 3.Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Cao, R.,Yan, Y. J.,Du, W. S.,et al. Fracture behaviour of 8%Ni 980 MPa high strength steel at various temperatures Part 2 - COD tests[J]. Materials Science and Technology,2011,27(1):145-155.
APA	Cao, R.,Yan, Y. J.,Du, W. S.,Tian, Z. L.,Peng, Y.,&Chen, J. H..(2011).Fracture behaviour of 8%Ni 980 MPa high strength steel at various temperatures Part 2 - COD tests.Materials Science and Technology,27(1),145-155.
MLA	Cao, R.,et al."Fracture behaviour of 8%Ni 980 MPa high strength steel at various temperatures Part 2 - COD tests".Materials Science and Technology 27.1(2011):145-155.