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通过对高碳５５ＳｉＭｎ２Ｍｏ贝氏体钢连续冷却转变曲线测定及转变组织研究发现，实验用钢的奥氏体连续冷却转变曲线显著右移，且珠光体转变区被强烈推迟，而贝氏体转变区被推迟较小，在较宽的冷却速度范围内可得到贝氏体转变组织。实验用钢的下贝氏体组织有典型的针状下贝氏体和非典型的针状下贝氏体两种形态，利用透射电镜对空冷条件下的非典型下贝氏体组织进行了观察和分析并探讨了其形成过程。
Through the continuous cooling transformation curve of high-carbon 55SiMn2Mo bainitic steel and the transformation of the microstructure, it was found that the continuous cooling transformation curve of the experimental steel significantly shifted to the right and the pearlite transformation zone was strongly delayed, while the bainite transformation zone Was delayed to a lesser extent and bainite transformed tissue was available over a wide range of cooling rates. The lower bainite of the experimental steel is characterized by two types of acicular inferior bainite and atypical acicular inferior bainite. The atypical lower bainite tissue under air cooling was observed by using transmission electron microscope And analyzed and discussed its formation process.