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研究了稀土对Mn-RE系贝氏体钢在连续冷却转变过程中贝氏体相变及组织形貌的影响。结果表明,稀土使CCT曲线右移和下移,提高了钢的淬透性,降低了马氏体和贝氏体转变点(Bs),而且使贝氏体组织明显细化。在贝氏体转变区,随冷速增加,稀土含量低的1号钢铁素体量急速下降,粒状贝氏体增多;当冷速超过40℃/min时,这两种钢的贝氏体形态由粒状向条状转变。冷速对稀土含量高的2号钢中贝氏体体积分数影响不大,主要是影响贝氏体的形态。
The effect of rare earth on bainite transformation and microstructure of Mn-RE bainitic steel during continuous cooling transformation was studied. The results show that the rare earth makes the CCT curve shift right and down, which improves the hardenability of steel, decreases the martensitic and bainitic transformation point (Bs), and significantly refine the bainite structure. In the bainite transformation zone, with the increase of cooling rate, the amount of 1 # ferrite with a low RE content decreased rapidly and the granular bainite increased. When the cooling rate exceeded 40 ℃ / min, the bainite morphology of both steels From granular to bar-like transition. The cooling rate has little effect on the volume fraction of bainite in No.2 steel with high RE content, mainly affecting the morphology of bainite.