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采用热膨胀仪和差示扫描量热仪(DSC)研究了过共析钢在连续加热条件下奥氏体化过程,测定了不同阶段的临界温度点,通过Thermo-Calc与Dictra软件进行了理论计算,并且研究了加热速率、初始组织以及含C量对其的影响.结果表明,整个连续加热过程可以分为5个阶段,临界温度点的实验结果与计算结果基本吻合.提高加热速率可以提高逆共析转变的起始和终了温度,增大逆共析转变温度区间,残余渗碳体溶解终了温度不变,奥氏体均匀化终了温度升高.粗大的珠光体初始组织使得逆共析转变起始和终了温度提高,增大了逆共析转变的温度区间,残余渗碳体溶解和奥氏体均匀化阶段的终了温度也有所提高.增大含C量对逆共析转变几乎没有影响,但是会明显提高残余渗碳体和奥氏体均匀化阶段终了的温度.
The austenitizing process of hypereutectoid steel with continuous heating was studied by means of dilatometer and differential scanning calorimeter (DSC). The critical temperature points in different stages were determined and calculated theoretically by Thermo-Calc and Dictra software The results show that the whole continuous heating process can be divided into five stages, and the experimental results at the critical temperature point are in good agreement with the calculated results. Increasing the heating rate can increase the adverse effect of heating rate Eutectoid transformation of the beginning and end of the temperature, increase the inverse eutectoid transformation temperature range, residual cementite dissolution temperature remains unchanged, austenite homogenization temperature finally increased.Of the coarse pearlite initial organization makes the inverse eutectoid transformation The initial and final temperature increase, increasing the temperature range of inverse eutectoid transformation, residual cementite dissolution and austenite homogenization phase of the end of the temperature has also increased. Increasing the amount of C has almost no effect on the inverse eutectoid transformation , But significantly increases the temperature at the end of the residual cementite and austenite homogenization phase.