退火温度对冷轧低碳钢再结晶行为的影响

Effect of annealing temperature on recrystallization behavior of cold rolled low carbon steel

利用热感应马弗炉模拟罩式退火工艺,研究不同退火温度对冷轧低碳钢再结晶行为的影响。结果表明,退火温度为565℃时,试样以回复软化机制为主,轧后扁平状的铁素体保持不变;退火温度上升到580℃时,试样的屈服强度和抗拉强度下降明显,断后伸长率迅速上升,维氏硬度值也显著下降,表明此阶段完成再结晶,组织以片层渗碳体为主,有少量变形的铁素体;退火温度达到580℃以上时,力学性能和硬度变化不明显,表明580℃时试样充分完成再结晶。

Effect of annealing temperature on recrystallization behavior of cold rolled low carbon steel was investigated by carrying out annealing experiment in thermo-induction muffle. The results show that at 565 ℃,recovery is the main softening mechanism and the grains remain lengthened. The yield and tensile strength decrease obviously,the elongation increases clearly and vickers hardness reduces sharply until the temperature rises to 580 ℃,that means recrystallization occuer in this state. The metallographic phase is consists of plentiful lamellar cementite and rare ferrite. When the temperature rises above 580 ℃,properties change unapparently,including yield and tensile strength,elongation and hardness,meaning that complete recrystallization finishes at 580 ℃ .