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采用差示扫描量热仪分别对未添加稀土和添加稀土的30Mn钢进行连续加热实验,利用Kissinger和JMA方程计算了材料的相变激活能和动力学因子。结果表明,添加0.2%(质量分数)的稀土硅铁合金使30Mn钢奥氏体化的起始温度A_(c1)和结束温度A_(c3)提高,相变激活能增加了186 k J/mol,相变动力学因子n值减小。未添加稀土和添加稀土的30Mn钢的奥氏体化过程均可分为2个阶段,并且不同阶段具有不同的晶粒长大机制。
Continuous heating experiments were carried out on the 30Mn steel without or with rare earth and rare earth added, respectively. The Kissinger and JMA equations were used to calculate the phase transformation activation energies and kinetic factors of the materials. The results show that the addition of 0.2% (mass fraction) rare earth ferrosilicon increases the initial austenite temperature A c1 and the final temperature A c3, and increases the activation energy by 186 k J / mol. Phase change kinetic factor n value decreases. The austenitization process of 30Mn steel without addition of rare earths and addition of rare earths can be divided into two stages, and different stages have different grain growth mechanisms.