CSP热轧工艺对Ti微合金化钢组织和性能的影响

来源期刊：钢铁钒钛2010年第2期

论文作者：霍向东 毛新平 杨青峰 柴毅忠 陈康敏

文章页码：26 - 31

关键词：紧凑式带钢生产； 轧制工艺； 碳化钛； 沉淀强化； 晶粒细化

Key words：compact strip production(CSP)； rolling parameters； titanium carbides； precipitation strengthening； grain refinement

摘    要：采用金相显微镜、电子显微镜、化学相分析等手段研究了CSP热轧工艺对Ti微合金化高强钢组织和性能的影响。结果表明:880℃终轧、620℃卷取试验钢的屈服和抗拉强度分别为825、895 MPa,钢中存在大量的纳米尺寸TiC粒子,其沉淀强化效果超过150 MPa;卷取温度降低到580℃,TiC的析出受到抑制,沉淀强化效果明显减弱。卷取温度显著影响钢中第二相粒子的析出过程,终轧温度和卷取温度改变对晶粒尺寸也有影响,两者综合作用的结果使Ti微合金化钢的强度和韧性发生变化。

Abstract: Experimental methods,such as SEM,TEM and chemical phase analysis,were used to study the effect of hot rolling parameters on the microstructure and properties of Ti microalloyed steel produced by compact strip production.The results show that the yield strength and tensile strength of steel were 825MPa and 895MPa respectively when finish rolling temperature 880℃ and coiling temperature 620℃.Large amount of nanometer TiC particles existed in steel,and the precipitation strengthening effect of these particles achieved to 150MPa.The precipitation of titanium carbides was inhibited and precipitation strengthening effect of nanometer particles reduced significantly as coiling temperature was decreased to 580℃.The change of coiling temperature had prominent effect on the precipitation of secondary phases in steels,and the grain size of steel strips was influenced by the change of rolling and coiling temperature.Comprehensive role of the two factors induced fluctuation of strength and toughness of Ti microalloyed steel.