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低碳Fe—Mn—Mo—V—N钢是我国研制的一种工程机械用钢,具有较高的强度和韧性。本文用分析电子显微镜,研究了此钢在不同回火温度下显微组织的变化规律和对机械性能的影响,探讨了此钢的强韧化机理。选区电子衍射测定了各种碳化物与基体的取向关系,发现Mo_2C与基体间可能存在着新的取向关系。此钢经950℃奥氏体化水淬后,强度可达100kg/mm~2以上,淬火组织为典型的位错型板条马氏体,无孪晶型马氏体。200～400℃回火,板条间和内部析出相为渗碳体。
Low-carbon Fe-Mn-Mo-V-N steel is a construction machinery steel developed in China, with high strength and toughness. In this paper, the electron microscopy was used to study the microstructure of the steel at different tempering temperature changes and the impact on the mechanical properties of the steel toughening mechanism. The electron diffraction of the selected area was used to determine the orientation relationship between various carbides and the matrix. It is found that there may be a new orientation relationship between the matrix and Mo_2C. The steel after austenitizing 950 ℃ water quenching, the strength of up to 100kg / mm ~ 2 above, the quenching organization is a typical dislocation lath martensite, no twin martensite. 200 ~ 400 ℃ tempering, between the slab and the internal precipitation of cementite.