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设计了一种低碳贝氏体型Q960工程机械用钢,在同种成分、同种轧制和淬火工艺下,研究了回火温度对Q960钢在单轴拉伸过程中的能量分布和晶界的影响机理。经分析得出,随着回火温度的升高,小角度晶界的频率先小幅度上升后逐渐降低且实验钢的强度也相应先升高后降低,大角度晶界频率逐渐升高且塑性和韧性提高,而应变硬化指数降低。单轴拉伸过程中的裂纹形成能随着回火温度的升高先降低后升高,在450℃回火时有一裂纹形成能量低谷。
A kind of low carbon bainitic steel for construction machinery Q960 was designed. Under the same composition, same rolling and quenching process, the effect of tempering temperature on the energy distribution and grain boundary The mechanism of influence. The analysis shows that with the increase of tempering temperature, the frequency of small-angle grain boundaries increases first and then decreases gradually, and the strength of experimental steel increases first and then decreases, while the frequency of large-angle grain boundaries gradually increases and plasticity And toughness increased, while the strain hardening index decreased. The crack formation in the uniaxial stretching process first decreases and then increases with the increase of tempering temperature, and a crack forms a low energy level when tempering at 450 ℃.