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研究了３０ＣｒＭｎＳｉＡ钢中马氏体（Ｍ）＋贝氏体铁素体（ＢＦ）＋铁素体（Ｆ）＋残留奥氏体（γＲ）多相复合组织形态、微观参量对强塑性的影响。研究结果表明，纤维状多相复合组织的屈服强度与Ｆ的强化状况及可动位错数量有关。极限强度主要受控于高强度相（Ｍ＋ＢＦ），尤其是Ｍ量及其强度，而塑性则与Ｆ纤维长度、γＲ量及各相强度差大小有关。采用１０５０℃预淬火＋７６０℃临界区加热＋４００℃短时等温热处理，可以获得最佳的强塑性配合，并且最高强塑性积（σｂ·δ５）可达３３５６１ＭＰａ·％，远高于块状复合组织。
The effects of microstructure and microstructure on the ductility of martensite (M) + bainitic ferrite (BF) + ferrite (F) + retained austenite (γR) in 30CrMnSiA steel were investigated. The results show that the yield strength of the fibrous multi-phase composite structure is related to the strengthening condition of F and the number of movable dislocations. Ultimate strength is mainly controlled by the high-strength phase (M + BF), especially the amount of M and its strength, whereas the plasticity is related to the F-fiber length, γR and the difference in strength between the phases. The best plasticity is obtained by pre-quenching at 1050 ℃, heating at critical temperature of 760 ℃ and isothermal heat treatment at 400 ℃ for short time, and the highest plasticity (σb · δ5) is up to 33561MPa ·% organization.