超低碳贝氏体钢埋弧焊焊缝金属的组织与力学性能
Microstructure and Mechanical Properties of Submerged Arc Welding Weld Metal for Ultra-low Carbon Bainitic Steel
摘 要
针对超低碳贝氏体钢HQ785DB的焊接特点, 在低碳钢焊丝的基础上设计了一种埋弧焊用焊丝, 将该焊丝匹配氟碱型SJ101焊剂对该钢进行焊接, 研究了焊缝金属的显微组织、力学性能及冲击断口形貌。结果表明: 焊缝金属组织以针状铁素体和板条贝氏体为主, 另有少量弥散分布的粒状贝氏体; 焊缝金属的抗拉强度为806.25 MPa, 伸长率为16.78%, 20 ℃时的冲击吸收功为183.25 J; 冲击断口上存在大量韧窝, 以微孔聚集型的韧性断裂为主。
埋弧焊
焊缝金属
ultra-low carbon bainitic steel
submerged arc welding
weld metal
Abstract
According to welding characteristics of ultra-low carbon bainitic steel HQ785DB, a submerged arc welding wire was developed on the basis of low carbon steel wire. Thus, the steel was welded with the welding wire and fluorine alkali SJ101 flux. The microstructure, mechanical properties and impact fracture morphology of weld metal were studied. The results show that the microstructure of the weld metal was mainly acicular ferrite and lath bainite mainly, and a small amount of granular bainite precipitated and dispersed in the weld metal. The tensile strength of weld metal was 806.25 MPa, the elongation was 16.78% and the impact toughness at 20 ℃ was 183.25 J. There were a large number of dimples in impact fracture surface, which mainly exhibited micro-void accumulation ductile fracture.
中图分类号 TG422.3 DOI 10.11973/jxgccl201601011
所属栏目 新材料 新工艺
基金项目 国家自然科学基金资助项目(51274162); 国家高技术研究发展计划(“863”计划)项目(2013AA031303); 陕西省教育厅专项科学研究项目(14JK1539)
收稿日期 2014/11/27
修改稿日期 2015/8/31
网络出版日期
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备注李继红(1971-), 男, 河南洛阳人, 讲师, 博士。
引用该论文: LI Ji-hong,CHEN Yang-yang,REN Xiao-long,ZHANG Min. Microstructure and Mechanical Properties of Submerged Arc Welding Weld Metal for Ultra-low Carbon Bainitic Steel[J]. Materials for mechancial engineering, 2016, 40(1): 43～46
李继红,陈阳阳,任晓龙,张敏. 超低碳贝氏体钢埋弧焊焊缝金属的组织与力学性能[J]. 机械工程材料, 2016, 40(1): 43～46
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参考文献
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【2】薛小怀, 钱百年, 国旭明, 等.高强高韧性管线钢埋弧用焊丝的研制［J］.焊接学报, 2002, 23(5):23-27.
【3】李冉, 魏金山, 彭云,等.X80管线钢气体保护焊用焊丝的研制［J］.焊接学报, 2007, 28(7):97-100.
【4】OH D W, OLSON D L, FROST R H. The influence of borron and titanium on low-carbon steel weld metal［J］. Welding Journal, 1990,69(4):151-158.
【5】EVANS G M. The effect of titanium in manganese-containing SMA weld deposits［J］. Welding Journal,1993,72(3):123-133.
【6】FARRAR R A, HARRISON P L. Acicular ferrite in carbon-manganese weld metals［J］.J Mater Set,1987,22(12):3812-3820.
【7】张敏, 吕金波, 王超.一种X100管线钢埋弧焊丝的研究与开发［J］.焊接学报, 2011,32(1):1-4.
【8】宋杰, 王哲, 曹睿,等.低碳贝氏体高强钢焊接接头的组织与拉伸性能［J］.机械工程材料, 2013,37(4):87-92.
【9】EVANS G M. The effects of manganese on the microstructure and properties of C-Mn all-weld deposits［J］. Welding Journal, 1980,59(3):67-75.
【10】程俊静, 贲能军, 梁文萍.TC4钛合金表面等离子渗钼后的摩擦磨损性能［J］.机械工程材料, 2013,37(9):59-63.
【11】BABU S S. The mechanism of acicular ferrite in weld deposits［J］. Current Opinion in Solid State & Materials Science, 2004,8(3/4):267-278.
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