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Effect of Cooling Condition on Microstructure and Mechanical Properties in Large Line Energy Welded Joints of Ultra-Fine Grained Steel

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Abstract:

The medium and heavy plate of 800 MPa grade ultra-fine grained steel was welded by CO2 gas shielded welding using large line energy. The effect of cooling condition on microstructure and mechanical properties of welded joints was investigated. The results showed that the cases about significant grain size increasing and strength decreasing do exist in the heat affected zone of large line energy welded joints of 800 MPa grade ultra-fine grained steel. Grain growth and softening in the heat affected zone could be suppressed effectively by water cooling in the course of welding. The mechanical properties of welded joints could be significantly increased by water cooling, and the process of CO2 gas shielded welding under water cooling is practical for joining ultra-fine grained steel using large line energy.

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Info:

Periodical:

Advanced Materials Research (Volumes 189-193)

Pages:

3345-3350

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.189-193.3345

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Cite this paper

Online since:

February 2011

Authors:

Hong Yun Zhao, Li Zhou, Bo Chen, Guo Dong Wang

Keywords:

Large Line Energy Welding, Mechanical Property, Microstructure, Ultra-Fine Grained Steel, Water Cooling

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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