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研究了19.8 T强磁场下中碳硅锰钢的高温珠光体等温相变。测定了不同工艺条件下马氏体(M)和珠光体(P)的显微硬度变化。采用EDS分析了各组织中合金元素的分布,表面Fe、Si、Mn在不同组织中存在一定成分起伏,但变化不大,M硬度主要受P转变量及C原子分布的影响。对组织转变量、P片间距、粒状P量进行统计分析,解释了P的显微硬度随等温温度升高先升后降,在995 K达到最大值,随等温时间延长,显微硬度下降的现象。
The high-temperature pearlite isothermal transformation of medium-carbon Si-Mn steels at 19.8 T magnetic field was studied. The changes of microhardness of martensite (M) and pearlite (P) under different technological conditions were measured. The distribution of alloying elements in each structure was analyzed by EDS. The surface Fe, Si and Mn had some composition fluctuation in different structures, but the changes were insignificant. The hardness of M was mainly affected by the amount of P transformation and C atom distribution. The results show that the microhardness of P increases first and then decreases with the increase of isothermal temperature, reaches the maximum at 995 K, and the microhardness decreases with the increase of isothermal time.