铝对微合金钢奥氏体分解动力学的影响

Effect of Al on Austenite Decomposition Kinetics in Microalloyed Steel

摘要: 通过实验室热模拟和轧制实验研究了添加0.21%Al对成分为0.05%C-1.7%Mn-0.4%Si-0.05%Nb-0.03%Ti(质量分数)的微合金钢奥氏体分解动力学的影响.结果表明:加入0.21%Al在冷速为10℃/s范围内明显抑制奥氏体向先共析铁素体的转变,提高了贝氏体的淬透性;对于780℃终轧后在600℃等温20min的钢板,Al通过提高碳的活度减轻或避免了带状组织的形成,明显提高了轧制钢板的力学性能.

Abstract: The influence of 0.21% Al (mass fraction) on the kinetics of austenite decomposition in microalloyed steel containing 0.05%C-1.7%Mn-0.4%Si-0.05%Nb-0.03%Ti was studied. The results show that the hardenability of the experimental steel increases apparently by adding 0.21% Al when the cooling rate is in the range of 1~30 ℃/s. For isothermal treated plates at 600 ℃ for 20 min after rolling process, the banding microstructure of the plates containing 0.21% Al is abated or avoided and the overall mechanical properties of the plates is promoted greatly.