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研究了采用分级淬火工艺生产贝氏体球铁时硅对相变组织及机械性能的影响，发现硅对贝氏体有诱发相变作用，从而可细化组织，提高机械性能，并对此作了理论分析。
The effect of silicon on the phase transformation microstructure and mechanical properties of bainitic ductile iron produced by fractional quenching was studied. Silicon was found to induce phase transformation in bainite so as to refine the microstructure and improve the mechanical properties. The theoretical analysis.