Microstructure Characterization of High-heat-input Welding Joint of HSLA Steel Plate for Oil Storage Construction

Abstract

Abstract:

In this paper, microstructure and mechanical properties of welding metals in 610 MPa high strength low alloy (HSLA) were studied after high-heat-input welding. Both the base material and the weld joint proved excellent strength and toughness by vibratory electrogas arc (VEGA) welding under 90 to 100 kJ/cm heat-input. The heat-affected zone (HAZ) was comprised of fine-grain zone (FGZ) and coarse-grain zone (CGZ), which characterizes fine granular structure and lathing-bainite substructure. It has found that large quantity of dispersed TiN and M23C6 precipitates restrain structure growing in HAZ and strengthen the weldment together with dislocations in the welded joint.

Key words: Weld joint, Microstructure, Precipitates, High-heat-input welding, Vibratory electrogas arc welding, On-line accelerated cooling, Off-line tempering

Weihua Sun,Guodong Wang,Jiming Zhang,Dianxiu Xia,Hao Sun. Microstructure Characterization of High-heat-input Welding Joint of HSLA Steel Plate for Oil Storage Construction[J]. J Mater Sci Technol, 2009, 25(06): 857-860.

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