低碳微合金双相钢沉淀相粒子的分析

An Analysis on Precipitated Phase Particles in Low Carbon Micro-Alloying Dual Phase Steel

采用萃取复型技术研究了实验室Φ450轧机控轧控冷后铁素体-马氏体双相钢(%:0.08C、0.22Si、1.02Mn、0.02Nb、0.013Ti、0.034Al)中沉淀相粒子。结果表明,该钢在1200℃时就存在尺寸为几十纳米的(Nb,Ti) (CN),经X-射线能谱分析得出,小颗粒中Nb含量大于Ti含量,形状不规则,大颗粒沉淀相主要含Ti,Nb含量较少,呈长方形;经控轧控冷后(Nb,Ti)(CN)为间隙析出,且主要在晶界处析出。

The precipitated phase particles in ferrite-martensite dual phase steel （0. 08C, 0. 22Si, 1.02Mn, 0. 02Nb, 0. 013Ti, 0. 034Al） rolled by Φ450 mill with control rolling and cooling process in laboratory has been studied by using carbon extraction-replica technique. Results showed that there was （Nb, Ti） （CN） precipitates with size being dozens nm at 1 200℃ ; with energy dispersive X-ray spectrometer analysis, the Nb content in smaller particles was higher than Ti content of which the shape was irregular, and in large particle of which the shape was rectangle, main content was Ti with minor Nb; and in steel by control rolling and cooling, the （ Nb, Ti） （CN） was interstitial precipitated phase and mainly precipitated at grain-boundary.