Intrinsic mechanisms of ductile-brittle transition for F460 steel welding coarse grained heat affected zones with different heat inputs

doi:10.11868/j.issn.1001-4381.2016.08.012

	Intrinsic mechanisms of ductile-brittle transition for F460 steel welding coarse grained heat affected zones with different heat inputs
	Li, Jing 2; Cao, Rui 2; Mao, Gao-Jun 2; Liu, Dong-Sheng 1; Chen, Jian-Hong 2
刊名	Cailiao Gongcheng/Journal of Materials Engineering
	2016-08-20
卷号	44 期号:8 页码:70-76
关键词	ABAQUS Aluminum sheet Austenite Bainite Ductility Fracture Microstructure Temperature Welding Cleavage fracture Coarse grain heat affected zone Coarse grained heat affected zone Critical events Ductile brittle transition Ductile-to-brittle transition temperature Scanning electronic microscopy (SEM) Thermomechanical simulator
ISSN号	10014381
DOI	10.11868/j.issn.1001-4381.2016.08.012
英文摘要	Coarse grain heat affected zone (HAZ) of F460 steel was simulated by a Gleeble 3800 thermo-mechanical simulator. The microstructure, critical event of the HAZ formed at various heat inputs (E) were characterized and determined by optical microscopy (OM) and scanning electronic microscopy (SEM), and cleavage fracture stress σf was also calculated by ABAQUS software. Based on above systematic analysis, the intrinsic mechanism of ductile-brittle transition for F460 steel heat affected zones with different heat inputs were revealed. The results indicate that: with the improvement of heat input, the microstructures in sequence are a minority of lath martensite and massive fine lath bainite, more lath bainite with less granular bainite, more granular bainite with less lath bainite, bulky of granular bainite; and the maximum size of the original austenite grain and bainite packet becomes bigger with the improvement of heat input. The size of bainite packet is critical event of the cleavage fracture for coarse grain heat affected zone specimens with various heat inputs by comparing the relationships among residual crack length, original austenite grain size and bainite packet size. With the decreasing of the bainitic packet, the ductile to brittle transition temperature decreases. In addition, cleavage fracture stress σf is also calculated by ABAQUS software, σf gradually decreases with the increase of the heat input, which can explain the intrinsic mechanism of ductile to brittle transition temperature Tk with the change of the heat input. © 2016, Journal of Materials Engineering. All right reserved.
语种	中文
出版者	Beijing Institute of Aeronautical Materials (BIAM)
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112766]
专题	材料科学与工程学院
作者单位	1.Institute of Research of Iron and Steel, Shasteel, Zhangjiagang; Jiangsu; 215625, China 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Li, Jing,Cao, Rui,Mao, Gao-Jun,et al. Intrinsic mechanisms of ductile-brittle transition for F460 steel welding coarse grained heat affected zones with different heat inputs[J]. Cailiao Gongcheng/Journal of Materials Engineering,2016,44(8):70-76.
APA	Li, Jing,Cao, Rui,Mao, Gao-Jun,Liu, Dong-Sheng,&Chen, Jian-Hong.(2016).Intrinsic mechanisms of ductile-brittle transition for F460 steel welding coarse grained heat affected zones with different heat inputs.Cailiao Gongcheng/Journal of Materials Engineering,44(8),70-76.
MLA	Li, Jing,et al."Intrinsic mechanisms of ductile-brittle transition for F460 steel welding coarse grained heat affected zones with different heat inputs".Cailiao Gongcheng/Journal of Materials Engineering 44.8(2016):70-76.