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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。
Gleeble3500 and SEM, TEM and other experimental methods were used to study the effects of large-wire energy welding on the CGHAZ structure and properties of 690MPa-grade oil storage tanks with different Ti contents. The results show that increasing the Ti content can significantly improve the strength and low temperature impact properties of the base metal, but will seriously deteriorate the impact properties of CGHAZ. With the increase of line energy, the impact performance of high-Ti steel CGHAZ sharply decreased, while the impact performance of low-Ti steel CGHAZ decreased slightly, the impact performance of low-Ti CGHAZ steel was significantly greater than the high Ti steel. It is believed that this is due to the increase of granular bainite, significant coarsening of TiN and the evolution of (Ti, Nb) N composition during the welding of large wire energy in high Ti steel.