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采用膨胀法结合金相-硬度分析法测定了10B33钢的连续冷却转变(CCT)曲线,研究了连续冷却过程中冷却速率对10B33钢组织和硬度的影响。结果表明:10B33钢在较宽的冷却速率范围内(0.1~20℃/s)可获得铁素体和珠光体组织,但随着冷速的增加,珠光体含量逐渐增加,且珠光体形貌由粗片状逐渐演变为层间距小的屈氏体。当冷速达到30℃/s时,转变为马氏体、部分屈氏体和极少量铁素体。整个冷速范围未发现明显贝氏体。随着冷却速率的增加,硬度逐渐提高。通过CCT曲线分析,制定了10B33钢的优化冷却工艺,得到了利于冷镦变形的理想铁素体和珠光体组织。
The continuous cooling transformation (CCT) curve of 10B33 steel was measured by expansion method combined with metallographic - hardness analysis. The effects of cooling rate on the microstructure and hardness of 10B33 steel during continuous cooling were investigated. The results show that the ferrite and pearlite can be obtained in a wide range of cooling rate (0.1 ~ 20 ℃ / s) for 10B33 steel, but the pearlite content gradually increases with the increase of cooling rate, and the pearlite morphology Gradually evolved from the coarse sheet into a narrow layer of troostite body spacing. When the cooling rate reaches 30 ℃ / s, it turns into martensite, partial troostite and a very small amount of ferrite. No obvious bainite was found in the entire cooling rate range. As the cooling rate increases, the hardness gradually increases. Through the analysis of CCT curve, the optimized cooling process of 10B33 steel was developed, and the ideal ferrite and pearlite structure which is favorable for cold heading deformation was obtained.