B元素对药芯焊丝焊缝金属针状铁素体形成的影响

刘政军,武丹,苏允海

doi:10.12073/j.hjxb.2018390291

B元素对药芯焊丝焊缝金属针状铁素体形成的影响

刘政军,武丹,苏允海

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出版历程
- 收稿日期: 2017-12-15

Effect of boron element on formation of acicular ferrite in weld metal with flux cored wire

LIU Zhengjun, WU Dan, SU Yunhai

摘要

摘要: 利用金相组织观察、冲击试验和热膨胀试验，研究了B元素含量变化对高强钢药芯焊丝焊缝金属中针状铁素体形成的影响，得到了不同试验温度下焊缝金属冲击吸收功. 结合透射电镜分析和分级淬火试验从热力学和动力学的角度对B元素影响机理进行了分析. 结果表明，焊缝金属组织晶界中含有自由状态的B元素具有抑制晶界铁素体形核利于针状铁素体生成的作用；N元素含量增加会降低晶界B元素含量，并提高奥氏体向铁素体转变的温度，减少针状铁素体含量；针状铁素体是在以Ti元素和Mn元素的氧化物为核心，以Cu元素和Mn元素的硫化物为外层，以BN为过渡层的复杂结构上形核并长大的；针状铁素体含量的增加有利于提高焊缝金属冲击吸收功，–60 ℃冲击吸收功最大为70 J.
- B元素|药芯焊丝|针状铁素体|N元素|冲击吸收功
Abstract: Influence of different boron contents on the formation of acicular ferrite in weld metal which was welded by flux cored wire for high strength steel was analyzed. Impact energies of weld metals at different test temperatures were acquired by metallographic observation, impact test and dilatometric test. Through thermodynamics and dynamics view, the influencing mechanism of the boron element on the formation of acicular ferrite was analyzed by transmission electron microscopy analysis and interrupted quench experiments methods. The results showed that the free boron element in weld metal grain boundaries suppressed the grain boundary ferrite formation and was beneficial to acicular ferrite nucleation. The free boron contents in the grain boundaries reduced with increasing nitrogen contents in weld metal. The transformation temperature of austenite to ferrite increased. The acicular ferrite content reduced. The acicular ferrite nucleated and grew on multiphase inclusions which took the titanium oxide and manganese oxide as the core, the copper sulfide and manganese sulfide as the hull, and the boron nitride as the transition layer. Increasing the acicular ferrite contents in weld meal was beneficial to improving the impact energy of weld metal. The maximum impact energy at -60 °C was 70 J.
- boron element|flux cored wire|acicular ferrite|nitrogen element|impact energy

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