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Chinese Journal of Materials Research  2012, Vol. 26 Issue (6): 567-571    DOI:
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Effects of Welding Heat Input on Properties of Joints of X100 Pipeline Steel
ZHANG Min, YANG Liang, LI Jihong
College of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048
Cite this article: 

ZHANG Min YANG Liang LI Jihong. Effects of Welding Heat Input on Properties of Joints of X100 Pipeline Steel. Chinese Journal of Materials Research, 2012, 26(6): 567-571.

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Abstract  

The effect of welding heat input on the microstructure and properties of X100 pipeline steel was studied. The results show that with the increase of heat input, the strength and toughness of X100 pipeline steel decrease due to the decrease of acicular ferrite in the weld zone and the coarser grains in HAZ. The smaller heat input can reduce the width, and increase the hardness in HAZ. The impact energy and the shear area of joints decrease with increasing heat input. The impact fracture is quasi-cleavage fracture. The microstructure of weld zone is mainly made up of acicular ferrite and granular bainitic which could bring excellent strength and toughness. The microstructure of HAZ has larger changes because of difference of the cooling rate under different welding heat input.

Key words:  metallic materials      X100 pipeline steel      welding heat input      properties     
Received:  28 September 2012     
ZTFLH:  TG407  
Fund: 

Supported by National Nature Science Foundation of China No. 51274162, the Natural Science Foundation of Shaanxi Province No. 2012JM6003 and the Science and Technology Program of Xi'an No.CX1250②.

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2012/V26/I6/567

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