氮对低碳微合金非调质钢组织和性能的影响

来源期刊：钢铁2010年第5期

论文作者：安航航 包燕平 李太全

文章页码：38 - 43

关键词：氮微合金化； 析出强化； 低碳微合金非调质钢

Key words：nitrogen microalloy； precipitation strengthening； low carbon unquenched micro-alloyed steel

摘    要：通过热力学计算和试验,研究了对Nb-V-Ti-N系低碳微合金非调质钢增氮,以及在液态和凝固过程中TiN夹杂物的析出规律,并且根据氮微合金化原理,确定了低碳微合金非调质钢中最佳的钛含量和氮含量的浓度范围。研究证明,通过调整钢中的氮含量,可以控制TiN夹杂物质量分数和尺寸,从而得到细小弥散的TiN作为针状铁素体的形核中心,细化钢的组织,增强钢的强度和韧性。

Abstract: By thermodynamic calculation and experiment,after nitrogen absorption on Nb-V-Ti-N low carbon unquenched micro-alloyed steel,precipitation regularity of inclusions of TiN in the process of liquid condition and solidification was studied.According to nitrogen microalloy principle,optimum titanium content and nitrogen content in the low carbon unquenched micro-alloyed steel was determined.The results show that volume fraction and size of TiN inclusion can be controlled through adjusting nitrogen content in the steel,and the fine and dispersive inclusions of TiN act as nucleating center of ferrite,which is helpful to refine structure and to improve strength and toughness.