采用光学显微镜及透射电子显微镜研究了Fe-0.88C-1.35Si-1.03Cr-0.43Mn 钢在200℃短时等温获得的下贝氏体的显微形貌及其精细结构.结果表明:试验钢在 200℃短时等温可获得宽度几十纳米,而长度在微米数量级的条状下贝氏体,在下贝氏体针内沿纵向存在大体与贝氏体针侧边界垂直且平行排列的位错列;贝氏体针纵向前沿的母相中存在间断的、层片状应变场衬度;下贝氏体相变早期具有马氏体切变相变的特征.
The fine structure and micro appearance of the low bainite obtained by short isothermal time at 200 ℃ in Fe-0. 88C-1. 35Si-1. 03Cr-0. 43Mn steel had been examined by optical microscope and transmission electron microscope. The results show that the test steel obtained lath low bainite with the nanometers in width and the micron in length by short isothermal time at 200 ℃. Parallel dislocation arrays perpendicular to the side boundary of the bainite perpendicular to the side boundary of the bainite lath were formed along the longitudinal direction of the bainite lath, and discontinuous and lamellar strain field contrasts existed in the parent phase of the bainitic longitudinal frontier, the low bainite transformation showed martensitic shear characteristics.
参考文献
| [1] | 方鸿生,杨志刚,杨金波,白秉哲.钢中贝氏体相变机制的研究[J].金属学报,2005(05):449-457. |
| [2] | T. Yokota;C. Garcia Mateo;H. K. D. H. Bhadeshia .Formation of nanostructured steels by phase transformation[J].Scripta materialia,2004(8):767-770. |
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