The determination of the weakest zone and the effects of the weakest zone on the impact toughness of the 12Cr2Mo1R welded joint

被引：9

作者：

Cao, Rui ^{[1
]}

Yang, Zhaoqing ^{[1
]}

Chan, Zhishan ^{[1
]}

Lei, Wanqing ^{[2
]}

Li, Jinmei ^{[2
]}

Zhang, Jianxiao ^{[3
]}

Liang, Xiaowu ^{[3
]}

Chen, Jianhong ^{[1
]}

机构：

[1] Lanzhou Univ Technol, Dept Mat Sci & Engn, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

[2] Lanzhou Ls Testing Technol Co Ltd, Lanzhou 730050, Peoples R China

[3] Lanzhou Ls Heavy Equipment Co Ltd, Lanzhou 730050, Peoples R China

来源：

JOURNAL OF MANUFACTURING PROCESSES | 2020年 / 50卷

关键词：

12Cr2Mo1R; The weakest zone of the welded joint; Coarse grain heat-affected zone; Impact toughness; HEAT-AFFECTED ZONE; SIMULATED CGHAZ; PIPELINE STEEL; MICROSTRUCTURE; INPUT; FRACTURE;

D O I：

10.1016/j.jmapro.2020.01.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For the actual welded joints, determination of the weakest zone in the welded and the effects of the weakest zone is very important in characterization of the welded joints. In this paper, microstructure feature and charpy toughness of the 12Cr2Mo1R for pressure vessels steel welded joints were systematically investigated. The standard Charpy V-notch impact test specimens were prepared on the base metal, weld metal and various zones of the heat affected zone. The weakest zone of the 12Cr2Mo1R welded joint and its effects on the impact toughness of the welded joint were studied. It shows that at - 30 degrees C, the weakest zone of the welded joint is the coarse-grained heat affected zone (CGHAZ), which impact toughness is 65 J, and its microstructure is composed of a large number of coarse granular bainite and a few blocks ferrite. With the fraction of CGHAZ on the ligament at the notch tip increases, the impact toughness decreases. The closer the CGHAZ location from the notch is, the less the impact toughness of the sample is. Above two aspects fully reflect the effect of the weakest zone on the toughness of the joint. This work reveals the effect of fraction of weakest zone in front of the notch tip on the impact toughness of the 12Cr2Mo1R welded joints.

引用

页码：539 / 546

页数：8

共 18 条

[1]

Chen J., 2014, MICROMECHANISM CLEAV

[2]

Easterling K., 2013, Introduction to the physical metallurgy of welding

[3] Effect of welding heat input on microstructures and toughness in simulated CGHAZ of V-N high strength steel [J].

Hu, Jun ;

Du, Lin-Xiu ;

Wang, Jian-Jun ;

Gao, Cai-Ru .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2013, 577 :161-168

[4] Measurement and analysis of SHCCT diagram for CLAM steel [J].

Huang, Yuming ;

Chen, Xizhang ;

Shen, Zheng ;

Madigan, Bruce ;

Yucheng, Lei ;

Zhou, Jianzhong .

JOURNAL OF NUCLEAR MATERIALS, 2013, 432 (1-3) :460-465

[5] Effects of microstructural change on fracture characteristics in coarse-grained heat-affected zones of QLT-processed 9% Ni steel [J].

Jang, JI ;

Ju, JB ;

Lee, BW ;

Kwon, D ;

Kim, WS .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 340 (1-2) :68-79

[6] Effect of heat input on impact toughness in transition temperature region of weld CGHAZ of a HY 85 steel [J].

Kumar, Sanjeev ;

Nath, S. K. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2016, 236 :216-224

[7] Mechanisms and modeling of cleavage fracture in simulated heat-affected zone microstructures of a high-strength low alloy steel [J].

Lambert-Perlade, A ;

Gourgues, AF ;

Besson, J ;

Sturel, T ;

Pineau, A .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (3A) :1039-1053

[8] Analysis of microstructural variation and mechanical behaviors in submerged arc welded joint of high strength low carbon bainitic steel [J].

Lan, Liangyun ;

Qiu, Chunlin ;

Zhao, Dewen ;

Gao, Xiuhua ;

Du, Linxiu .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 558 :592-601

[9] Microstructural characteristics and toughness of the simulated coarse grained heat affected zone of high strength low carbon bainitic steel [J].

Lan, Liangyun ;

Qiu, Chunlin ;

Zhao, Dewen ;

Gao, Xiuhua ;

Du, Linxiu .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 529 :192-200

[10] Microstructure transformation of X70 pipeline steel welding heat-affected zone [J].

Li, Hui ;

Liang, Jing-Long ;

Feng, Yun-Li ;

Huo, Dong-Xing .

RARE METALS, 2014, 33 (04) :493-498

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