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Chinese Journal of Materials Research  2013, Vol. 27 Issue (3): 237-246    DOI:
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The Fracture Toughness of Butt Weld at Low Temperature of 960 MPa High-strength Steel
WANG Yuanqing LIU Xiyue** SHI Yongjiu
(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084)
Cite this article: 

WANG Yuanqing,LIU Xiyue,SHI Yongjiu. The Fracture Toughness of Butt Weld at Low Temperature of 960 MPa High-strength Steel. Chinese Journal of Materials Research, 2013, 27(3): 237-246.

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Abstract  

A series of three point bending tests of 960 MPa high- strength steel at low temperature were carried out in the present study, five temperature points were selected for the tests, and the crack tip opening displacement was taken as the fracture toughness index. The fracture behavior of butt weld of 960 MPa steel were analyzed based on the experimental phenomenon, the relationship between fracture toughness and temperature was investigated and the test data were fitted by the Boltzmann function, and the fracture micro mechanism was analyzed by electron microscope scanning. The results show that the variation trend of fracture toughness (critical CTOD valuesδm) is decline as temperature decreases, theδm values of 960 MPa steel are lower than that of Q235, Q345, Q390 and Q460 steels, and theδm values of the HAZ are lower than that for base material and weld metal, and the ductile-brittle transition temperature for HAZ(-12.45℃) is higher than that for base material and weld metal as well.
Key words:  metallic materials      high- strength steel      butt weld      low temperature      fracture toughness      crack tip opening displacement     
Received:  19 April 2013     
ZTFLH:  TU511  
Fund: 

*Supported by National Natural Science Foundation of China No.51178244.
About author:  **To whom correspondence should be addressed, Tel: (010)62792330, E-mail: Liuxy85722@163.com
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https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2013/V27/I3/237

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