采用扫描电镜和 X 射线衍射仪研究了淬火-配分(Q&P)工艺处理碳-硅-锰钢的显微组织，分析了配分温度对其力学性能和拉伸断口形貌的影响.结果表明：随着配分温度的升高，试验钢中的马氏体组织逐渐从淬火马氏体向回火马氏体转变，抗拉强度降低，伸长率增大，当配分温度为420℃时其强塑积达到最大，为23366．64 MPa??％；试验钢伸长率随配分温度的变化趋势与其残余奥氏体含量的变化趋势基本一致，当配分温度为420℃时残余奥氏体体积分数最大，为14．4％，此时伸长率也达到最大，为23％；随着配分温度的升高，试验钢拉伸断口纤维区不断变大而放射区不断变小，且纤维区韧窝数量不断增多.
The microstructures of C-Si-Mn steel by the quenching and partitioning (Q&P)treatment was studied by scanning electron microscopy and X-ray diffraction,and then the effects of partitioning temperatures on mechanical properties and fracture morphology of the steel were analyzed.The results show that with the increase of the partitioning temperature,the martensite in the experimental steel was gradually transformed from quenched martensite to tempered martensite,and the tensile strength of the steel decreased while the elongation increased. The product of strength and elongation reached the maximum value of 23 366.64 MPa?% at the temperature of 420 ℃.The elongation changing with partitioning temperature trend of the experimental steel coincided well with that of retained austenite content.The volume fraction of retained austenite reached the maximum value of 14.4% at 420 ℃,meanwhile the elongation reached the maximum value of 23%.With the partitioning temperature increase, the fibrous area at the tensile fracture surface of the steel enlarged while the radial area decreased,and the number of dimples at the fibrous area increased constantly.
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