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

作　　者：Weihua Sun Guodong Wang Jiming Zhang Dianxiu Xia Hao Sun 

机构地区：[1]State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China [2]R & D Center, Jinan Iron and Steel Group Co., Ltd., Jinan 250101, China

出　　处：《Journal of Materials Science & Technology》2009年第6期857-860,共4页材料科学技术（英文版）

摘　　要：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 heatinput. 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 M23E6 precipitates restrain structure growing in HAZ and strengthen the weldment together with dislocations in the welded joint.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 heatinput. 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 M23E6 precipitates restrain structure growing in HAZ and strengthen the weldment together with dislocations in the welded joint.

关 键 词：Weld joint Microstructure PRECIPITATES High-heat-input welding Vibratory electrogas arc welding On-line accelerated cooling Off-llne tempering 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TQ174.1[金属学及工艺—金属材料]