Influence of aluminium content on microstructure and mechanical properties of weld metal with flux-cored wires for high strength steel
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摘要: 采用自行研制的高强钢药芯焊丝焊接Q960钢，通过改变药芯成分中Al元素的含量获得了含有不同Al元素的焊缝金属。利用拉伸试验、不同温度下冲击试验对焊缝金属的强度和韧性进行了测试；结合金相组织、扫描电镜观察等手段分析了Al元素对焊缝金属组织和性能的影响机理。结果表明：焊缝金属中Al元素含量的变化对接头抗拉强度和断后伸长率影响不大，但对焊缝金属冲击吸收能量影响较大。随着Al元素含量的增加，冲击吸收能量呈现先增大后降低的趋势。当Al元素含量较低时，易生成Al2O3氧化物，针状铁素体易形核和长大，有利于提高焊缝金属冲击吸收能量；当Al元素含量较高时，易生成AlN氮化物，同时组织中存在着δ-铁素体组织，造成焊缝金属冲击能量降低。Abstract: Q960 high strength steel welded with self-developed flux cored wire. Weld metal with different Al element content were obtained by changing aluminium powder content in flux core composition. Tensile strength and toughness of weld metal were achieved by tensile and impact test at different test temperature. Combined with metallographic observation and scanning electron microscope observation,the influence mechanism of Al element on microstructure and properties of weld metal was analyzed. The results show that changing Al element content in weld metal has few effects on tensile strength and elongation,but has great effect on impact energy of weld metal. With Al element content being increased in weld metal,the impact energy increases firstly and then decreases. When Al content is low,Al2O3 oxides are easily formed in weld metal which is beneficial to nucleation and growth of acicular ferrite,which improve impact energy of weld metal. But when Al content is high,Al N nitride is easily formed,and δ-ferrite is formed,which results in the low impact energy of weld metal.
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Keywords:
- flux cored wire /
- acicular ferrite /
- impact energy /
- inclusion
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