Correlation between microstructural features of granular bainite, roughness of fracture surface and toughness of simulated CGHAZ in QT type HSLA steels

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	Correlation between microstructural features of granular bainite, roughness of fracture surface and toughness of simulated CGHAZ in QT type HSLA steels
	D. W. Tian; L. P. Karjalainen; B. N. Qian; X. F. Chen
	1996
发表期刊	Scandinavian Journal of Metallurgy
ISSN	0371-0459
卷号	25 期号:2 页码:87-94
摘要	Background/aims. In order to understand the interrelation between microstructure and toughness in modern high-strength steels, the main attention has been paid to the role of martensite-austenite particles as a site of crack initiation in granular bainite. An effort was undertaken here to investigate the microstructural factors affecting the propagation of the cleavage fracture. Methods. Charpy-V impact testing and tensile testing were carried out at low temperatures using specimens with a microstructure of simulated coarse-grained heat-affected zone in quenched and tempered, high-strength low-alloyed steels. Electron microscopy was employed to examine the interaction between a cleavage crack and the microstructural constituents on the fracture profile. Results and conclusions. Kinks of 7 types were detected on the fracture profile. They were further classified into 3 categories by their effects on toughness. Beneficial, harmful and non-effective kinks resulted from high-angle interfaces, mariensite-austenite constituents and the intersection of 2 individual straight microcracks, respectively. All kinks increased roughness, but the beneficial kinks favored, the harmful deteriorated, and the non-effective did not affect toughness. Accordingly, it can be concluded that toughness cannot be estimated reliably from roughness measurements. (C) Munksgaard, 1996
部门归属	acad sinica,inst met res,shenyang 110015,peoples r china.;tian, dw (reprint author), univ oulu,mat engn lab,pob 444,fin-90571 oulu,finland
关键词	Granular Bainite M-a Constituents Toughness Roughness Cleavage Fracture Fracture Profile Simulated Cghaz Qt-hsla Steels Heat-affected Zones General-method Cleavage Metals
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38409
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. W. Tian,L. P. Karjalainen,B. N. Qian,et al. Correlation between microstructural features of granular bainite, roughness of fracture surface and toughness of simulated CGHAZ in QT type HSLA steels[J]. Scandinavian Journal of Metallurgy,1996,25(2):87-94.
APA	D. W. Tian,L. P. Karjalainen,B. N. Qian,&X. F. Chen.(1996).Correlation between microstructural features of granular bainite, roughness of fracture surface and toughness of simulated CGHAZ in QT type HSLA steels.Scandinavian Journal of Metallurgy,25(2),87-94.
MLA	D. W. Tian,et al."Correlation between microstructural features of granular bainite, roughness of fracture surface and toughness of simulated CGHAZ in QT type HSLA steels".Scandinavian Journal of Metallurgy 25.2(1996):87-94.