Effects of tensile prestrain on the notch toughness of low-alloy steel

doi:10.1007/s11661-003-0126-9

	Effects of tensile prestrain on the notch toughness of low-alloy steel
	Chen, JH; Li, Z ; Wang, GZ
	2003-05
发表期刊	METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN	1073-5623
卷号	34A 期号:5 页码:1055-1068
摘要	Tensile prestrains of various levels were applied to blank steel specimens. Four-point bend tests of notched specimens at various temperatures revealed an appreciable drop in the notch toughness of the specimens, which experienced 3 pct tensile prestrain. Further prestrains of up to 20 pet had a negligible effect on the notch toughness despite additional increases in the yield strength. Microscopic analyses combined with finite element method (FEM) calculations revealed that the decrease in toughness resulted from a change of the critical event controlling the cleavage fracture. The increase in yield strength provided by prestraining allowed the normal tensile stress at the notch tip to exceed the local fracture stress sigma(f) for propagating a just-nucleated microcrack. As a result, for the coarse-grained steel with low sigma(f) tested presently, the critical event was changed from tensile stress-controlled propagation of a nucleated microcrack to plastic strain-controlled nucleation of the microcrack at the notch tip. A reduction of toughness was induced as a result of this. The increase in yield strength provided by decreasing the test temperature acted in the same way.
DOI	10.1007/s11661-003-0126-9
收录类别	SCI ; SCIE
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000182676700003
出版者	MINERALS METALS MATERIALS SOC
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/35885
专题	材料科学与工程学院_特聘教授组
通讯作者	Chen, JH
作者单位	1.Gansu Univ Technol, State Key Lab New Nonferrous Met Mat, Gansu 730050, Peoples R China 2.Dalian Univ Sci & Engn, Inst Engn Mech, Dalian 116000, Peoples R China
推荐引用方式 GB/T 7714	Chen, JH,Li, Z,Wang, GZ. Effects of tensile prestrain on the notch toughness of low-alloy steel[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2003,34A(5):1055-1068.
APA	Chen, JH,Li, Z,&Wang, GZ.(2003).Effects of tensile prestrain on the notch toughness of low-alloy steel.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,34A(5),1055-1068.
MLA	Chen, JH,et al."Effects of tensile prestrain on the notch toughness of low-alloy steel".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 34A.5(2003):1055-1068.

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