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研究了 30CrMnSiA钢中回火温度对M (马氏体 ) +F(铁素体 )双相组织 ,M+F +B(贝氏体 ) +AR(残余奥氏体 )多相复合组织 ,及其强度的影响。结果表明 :经预淬火的多相复合组织 ,随回火温度的提高 ,强度和塑性同时增加 ,直到 4 50℃以上才明显降低。这与该组织中纤维形态复相区的残留奥氏体的稳定性、分解过程、以及延缓碳化物的沉淀和聚集有关。而未经预淬火的块状多相复合组织、M +F双相组织经回火后的强度主要与M性能变化有关。而屈服强度则取决于复相中塑性相经回火后的性能变化。
The effects of tempering temperature on the microstructures of M (martensite) + F (ferrite) duplex, M + F + B (bainite) + AR (retained austenite) in 30CrMnSiA steel were investigated. The effect of its intensity. The results show that the strength and ductility of the pre-quenched multi-phase composite structure increase with the increase of tempering temperature, but it is not obvious until it is over 450 ℃. This is related to the stability of the retained austenite in the fibrous phase of the tissue, the decomposition process, and the delay in the precipitation and accumulation of carbides. Without pre-quenched massive polyphase composite structure, the strength of M + F dual-phase structure after tempering is mainly related to the change of M performance. The yield strength depends on the plastic phase in the complex after tempering the performance changes.