大线能量焊接对不同Ti含量石油储罐钢性能影响
Effect of High Heat Input Welding on Properties of Oil Storage Tank Steel with Different Ti Content
刘学利1， 蔡庆伍1， 武会宾1， 梁国俐
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作者单位：（1.北京科技大学 高效轧制国家工程研究中心，北京 100083 ；2.唐山学院 机电工程系，河北 唐山 063000）
中文关键字：石油储罐； 大线能量焊接； CGHAZ； 韧性
英文关键字：oil storage tank; high heat input welding; CGHAZ; toughness
中文摘要：采用Gleeble3500并结合SEM、TEM等实验方法研究了大线能量焊接对不同Ti含量690MPa级石油储罐用钢粗晶热影响区（CGHAZ）组织、性能的影响。结果表明，提高Ti含量可显著提高母材的强度和低温冲击性能，但会严重恶化CGHAZ的冲击性能。随线能量的升高，高Ti钢CGHAZ的冲击性能急剧下降，而低Ti钢CGHAZ冲击性能则下降较小，低Ti钢CGHAZ的冲击性能逐渐明显大于高Ti钢。分析认为这是由于高Ti钢大线能量焊接时粒状贝氏体增多、TiN显著粗化及（Ti,Nb)N成分演变所致。
英文摘要：The effects of high heat input welding on the microstructure and mechanical properties of coarse grain heat-affected-zone (CGHAZ)of 690MPa oil storage tank steel with different Ti content were studied by Gleeble-3500，SEM and TEM. The results show that, with the increase of Ti content, the base metal strength and low temperature impact toughness significantly improve, but there is a serious deterioration in CGHAZ impact property. With increasing heat input, the CGHAZ impact property of high-Ti steel sharply declines, while low-Ti steel reduces small, the CGHAZ impact property of low-Ti steel is higher than high-Ti steel. This is due to the increase of granular bainite in high-Ti steel, coarsening of TiN and composition change of (Ti,Nb) N during high heat input welding.