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采用电子背散射衍射技术(EBSD)研究12 T磁场作用下硅锰铸钢磁诱发珠光体(MIP)的形核与生长。结果表明:低转变量的相变初期,组成相之一的珠光体铁素体相(PF)主要沿着<110>//ND方向生长,具有<111>//ND和<100>//ND等其他位向所占比例相对较低,表现出一定的择优形核与生长;随着转变量的增加,初期成核的PF维持其择优晶向长大,新生相的晶体学位向除受到界面能、体积自由能以及磁自由能等的综合影响外,还将受到母相中逐渐累积的弹性应变能的限制,空间取向趋于多向化,表现为中后期形成的MIP的择优生长趋势变弱,其他取向的MIP相对比例也有所降低,失去了<110>//ND的择优性;将100%转变量的试样继续延长磁处理时间,表现为无微织构特征。
The electron backscatter diffraction (EBSD) was used to study the nucleation and growth of magnetically induced pearlite (MIP) in Si-Mn cast steel under the action of 12 T magnetic field. The results show that the pearlite ferrite phase (PF), one of the constituent phases, mainly grows in the direction of <110> // ND with the phase transition of <111> // ND and <100> // ND and other bits accounted for a relatively low proportion, showing some preferred nucleation and growth; with the increase of the amount of transformation, the initial nucleation of PF maintain its preferred crystal growth, except for the crystallographic orientation of the nascent phase Interface energy, volumetric free energy and magnetic free energy, it will also be limited by the gradual accumulation of elastic strain energy in the parent phase. The spatial orientation tends to be multi-directional, showing the trend of preferential growth of MIP formed in the middle and later stages Weakened, the relative orientations of other orientations also decreased, losing the <110> // ND preponderance. The specimens with 100% transitions were prolonged for the duration of magnetic treatment, showing no texture features.