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采用DIL805L型膨胀仪研究了弹簧钢52Cr Mo V4连续冷却相变组织变化规律,分析了合金元素和冷却速度对CCT曲线、相变组织和显微硬度的影响。结果表明:Cr、Mo、V、Mn等元素的加入使得弹簧钢52Cr Mo V4珠光体和贝氏体转变曲线完全分离,可以在较宽的冷却速度范围内得到马氏体+贝氏体组织,当冷却速度大于等于5℃/s时,连续冷却转变获得单一的马氏体组织。冷却速度增加,促使了连续冷却转变后的组织细化,显微硬度增大。
The phase transformation microstructure of 52Cr Mo V4 steel was studied by DIL805L dilatometer. The effects of alloying elements and cooling rate on CCT curve, phase transformation microstructure and microhardness were analyzed. The results show that the addition of Cr, Mo, V, Mn and other elements makes the 52Cr Mo V4 pearlite and bainite transformation curves of spring steel completely separated, and the martensite + bainite structure can be obtained in a wide range of cooling rate. When the cooling rate is greater than or equal to 5 ℃ / s, continuous cooling transformation to obtain a single martensite. Cooling rate increases, prompting the continuous cooling transformation of the organization refinement, increased microhardness.