Microstructure and Mechanical Properties of Joints of X100 Line Pipe by Submerged Arc Welding

Min Zhang; Liang Yang

doi:10.4028/www.scientific.net/AMM.310.139

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 310Microstructure and Mechanical Properties of Joints...

Microstructure and Mechanical Properties of Joints of X100 Line Pipe by Submerged Arc Welding

Abstract:

The microstructure, mechanical properties, fracture morphology and crystal texture of pipeline steel X100 welded joints were investigated using optical electron microscope, scanning electron microscope, tensile and impact testing machine. The results show that, the texture of X100 line pipe mainly consists of acicular ferrite and granular bainite in weld zones, the microstructure of HAZ is coarser, which lead to softening and embrittlement. The fusion line is clear between outer weld and inner weld. The tensile strength of welded joint gets to 803 MPa, which is about 94.81% of the base materials. The impact energy at -10°C is more than 120J, and the average of percent shear fracture appearance at -10°C is up to 85%, is ductile fractures.

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Periodical:

Applied Mechanics and Materials (Volume 310)

Pages:

139-144

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.310.139

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Online since:

February 2013

Authors:

Min Zhang, Liang Yang

Keywords:

Microstructure, Property, Submerged Arc Welding, X100

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References

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