Effects of Two Different Cyclic Heat Treatments on Microstructure and Mechanical Properties of Ti-V Microalloyed Steel

In this work the effects of two different cyclic heat treatments (traditional route and new-designed route, named as Route 1 and Route 2, respectively) on microstructure and mechanical properties of Ti-V microalloyed steel were investigated. The results showed that the mean grain size initially decreased on execution of 1-cycle (~13.9 μm) and then remained almost constant during the subsequent cycles for Route 1. By contrast, the mean grain size decreased continuously with cyclic numbers and reached ~4.6 μm at 7-cycle for Route 2. For Route 1, with cyclic numbers UTS decreased continuously a...