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利用力学实验及微观分析手段,研究了超低碳针状铁素体管线钢的显微特征及其对强韧性的影响.结果表明,通过纯净化和热加工工艺优化,可在超低碳管线钢中获得具有以针状铁素体为主的显微组织,并在其铁素体晶界上发现有马氏体薄膜的存在,这些微观特征成为大幅度提高超低碳针状铁素体管线钢强韧性的重要因素.
The microscopic characteristics of the ultra-low carbon acicular ferritic steel and its effect on the toughness were studied by means of mechanical experiments and microanalysis.The results show that through the purification and thermal processing optimization, Steel obtained with acicular ferrite-based microstructure, and found in the ferrite grain boundaries exist martensite films, these micro-features have become greatly enhanced ultra-low carbon acicular ferrite Pipeline toughness of the important factors.