Influence of fraction of coarse-grained heat affected zone on impact toughness for 09MnNiDR welded joint

doi:10.12073/j.hjxb.20190818003

	Influence of fraction of coarse-grained heat affected zone on impact toughness for 09MnNiDR welded joint
	Cao, Rui 1; Yang, Zhaoqing 1; Li, Jinmei 3; Lei, Wanqing 3; Zhang, Jianxiao 2; Chen, Jianhong 1
刊名	Hanjie Xuebao/Transactions of the China Welding Institution
	2020-05-25
卷号	41 期号:5 页码:7-13
关键词	Bainite Fracture toughness Microstructure Submerged arc welding Temperature Welded steel structures Coarse grain heat affected zone Coarse grained heat affected zone Fine grain heat affected zone Fracture surfaces Granular bainites Impact absorbed energy Low temperatures Pressure vessel steels
ISSN号	0253360X
DOI	10.12073/j.hjxb.20190818003
英文摘要	The impact absorbed energy of various regions of the heat affected zone(HAZ) of submerged arc welding actual welded joint for 09MnNiDR low temperature pressure vessel steel was measured, the microstructures, fracture surface were observed and anlyzed. Based on the experimental results, the microstructures of all regions of HAZ, the weakest region can be determined, and the effects of the weakest region on impact toughness of the welded joint were further discussed. The results show that at-70, the average impact absorbed energy of the base metal, subcritical heat affected zone, intercritical heat affected zone, and fine grain heat affected zone of the welded joint is above 270 J, which all show good toughness. The average impact absorbed energy of the weld metal is 139 J. The coarse grain heat affected zone (CGHAZ) is the weakest region of the welded joint. When the notch tip is completely composed of CGHAZ, the impact absorbed energy of 20 J is reached. The impact energy of CGHAZ decrease to 92.7% of the base metal. The microstructure of CGHAZ is composed of coarse granular bainite, lath bainite and block ferrite. With the increase of the fraction of CGHAZ in front of the notch tip, the closer from notch location is, the lower the impact absorbed energy of the specimen is, which fully reflects the influence of the weakest region on the impact toughness. © 2020, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
语种	中文
出版者	Harbin Research Institute of Welding
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115481]
专题	材料科学与工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Lanzhou Ls Heavy Equipment Co., Ltd., Lanzhou; 730314, China 3.Lanzhou Ls Testing Technology Co., Ltd., Lanzhou; 730000, China;
推荐引用方式 GB/T 7714	Cao, Rui,Yang, Zhaoqing,Li, Jinmei,et al. Influence of fraction of coarse-grained heat affected zone on impact toughness for 09MnNiDR welded joint[J]. Hanjie Xuebao/Transactions of the China Welding Institution,2020,41(5):7-13.
APA	Cao, Rui,Yang, Zhaoqing,Li, Jinmei,Lei, Wanqing,Zhang, Jianxiao,&Chen, Jianhong.(2020).Influence of fraction of coarse-grained heat affected zone on impact toughness for 09MnNiDR welded joint.Hanjie Xuebao/Transactions of the China Welding Institution,41(5),7-13.
MLA	Cao, Rui,et al."Influence of fraction of coarse-grained heat affected zone on impact toughness for 09MnNiDR welded joint".Hanjie Xuebao/Transactions of the China Welding Institution 41.5(2020):7-13.