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采用电子显微分析方法及X射线衍射技术等研究了“淬火+分配”热处理工艺(Quenching and partitioning,简称Q&P工艺)对60Mn2Si Cr钢组织转变的影响。结果表明,由于Q&P工艺处理过程中少量马氏体组织所带来的晶体缺陷,有利于非均匀形核,在促进超级贝氏体生成的同时还细化了组织;同时,由于碳在α相中具有高的化学势,引起产生自少量马氏体组织中的排碳,以及贝氏体铁素体形成时碳的短程扩散,导致残留奥氏体中碳含量有所增加,稳定性提高。其效果将会有利于改善超级贝氏体组织的强韧性。
The effects of “Quenching and partitioning” (Q & P) on the microstructure transformation of 60Mn2Si Cr steel were studied by means of electron microscopy and X-ray diffraction. The results show that due to the crystal defects brought by a small amount of martensite during the Q & P process, it is in favor of heterogeneous nucleation and refinement of the super bainite while refining the microstructure. At the same time, Has a high chemical potential, causing carbon emission from a small amount of martensite and short-range carbon diffusion during formation of bainitic ferrite, resulting in an increase in carbon content in retained austenite and an increase in stability. The effect will be to improve the toughness of super bainitic tissue.