卷取温度对Ti-IF钢热轧卷组织和性能的影响

Effect of Coiling Temperature on Microstructures and Mechanical Properties of Hot-rolled Bands of Ti-IF Steel

对不同卷取温度生产的典型成分的Ti-IF钢热轧卷进行了显微组织、织构和力学性能测试,研究了卷取温度对其组织和性能的影响。试验结果表明,试验钢热轧卷具有细小的铁素体晶粒,晶粒度在11．0级左右,卷取温度对铁素体晶粒度无显著影响；热轧卷表现为较强的择优取向,在{115}〈110〉、{223}〈110〉和{332}〈110〉附近的取向分布密度较高,且不随卷取温度的升高而发生变化,但随着卷取温度的升高,热轧卷晶粒均匀性提高,上述取向的密度都降低；随着卷取温度的升高,强度降低,但延伸率表现为先增加后降低的趋势。

Effect of coiling temperature on microstructures and mechanical properties of hot - rolled bands of Ti - IF steel was studied by means of optical microscopy, X - ray texture measurement and tensile property testing. The results show that the hot bands not only exhibit fine - grained ferrite measured to be approximately ASTM grade 11.0 but also show obvious textures. The main texture components were {115}〈 110 〉 , {223}〈 110 〉 and {332 } 〈 110 〉 along a fiber. The coiling temperatures during hot rolling seems to have little effect on the ferrite grain size, whereas the microstructure seems to be more homogeneous and the density of all above - mentioned texture orientations seemed to decrease ing temperature causes strength to drop and elongati with the increasing of coiling temperature. Increasing coilon to increase at first and then to decrease.