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应用元胞自动机-有限元模型(CAFE),模拟了不同碳、磷含量对易切削钢9SMn28凝固组织的影响,并通过热力学计算分析结果,优化了钢中的碳、磷含量。模拟结果表明,C含量在0.09 wt%~0.16 wt%时,随C的增加,柱状晶随之而减小;C含量从0.09 wt%增加到0.15 wt%时,晶粒逐渐细化。P含量在0.02 wt%~0.10 wt%时,随P的增加,晶粒逐渐细化。同时,对C、P模拟结果进行了实验验证,实验与模拟结果吻合较好。因此,易切削钢9SMn28的C与P含量应该分别取0.15 wt%及0.10wt%,可以有效地改善9SMn28的凝固组织。
The cellular automaton - finite element model (CAFE) was used to simulate the effect of different carbon and phosphorus content on the microstructure of 9SMn28 free cutting steel. The results of thermodynamic calculation and analysis of carbon and phosphorus content in steel were optimized. The simulation results show that the columnar grains decrease with the increase of C content when the C content is 0.09 wt% ~ 0.16 wt%, while the grain size is gradually refined when the C content is increased from 0.09 wt% to 0.15 wt%. When the content of P is 0.02 wt% ~ 0.10 wt%, the grain size decreases with the increase of P content. At the same time, the C and P simulation results are verified by experiments, and the experimental and simulation results are in good agreement. Therefore, free-cutting steel 9SMn28 C and P content should be taken 0.15wt% and 0.10wt% respectively, which can effectively improve the 9SMn28 solidified tissue.