采用金相显微镜、电子显微镜等手段研究控轧控冷工艺对Ti微合金化高强钢的组织和性能的影响.结果表明:在低温终轧(800℃)、600℃保温1h的试验钢的屈服强度和抗拉强度最高,分别为670.7 MPa和752 MPa.高温终轧(1 030℃)的试验钢组织主要为准多边形铁素体、针状铁素体和粒状贝氏体,组织粗大;低温终轧(800℃)的组织主要为多边形铁素体,晶粒较细小.在600℃保温1h的试验钢中存在大量的纳米尺寸TiC粒子,沉淀强化效果明显,未在600℃保温1h的试验钢中,TiC的析出受到限制,沉淀强化效果明显减弱.
The effects of controlled rolling and cooling process on the microstructure and properties of Ti micro-alloyed high strength steel were investigated by metalloscope,SEM and TEM,etc.The results show that the highest yield strength and tensile strength of the steel sample are respectively 670.7 MPa and 752 MPa at 800 ℃ of low temperature final rolling and 600 ℃ for 1 h of insulation.The steel sample at high rolling temperature (1 030 ℃) has coarse microstructures of quasi-polygonal ferrite,acicular ferrite and granular bainite,and the sample at low rolling temperature (800 ℃) has fine grains of polygonal ferrite.Large amounts of nanometer TiC particles exist in the tested steel at 600 ℃ for 1 h of insulation with significant precipitation strengthening,while the precipitation of TiC particles in the steel sample without insulation is inhibited with obvious decrease of precipitation strengthening effectiveness.
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