【摘要】 用DIL805L相变淬火膨胀仪测定了Ni-Cu-Nb复合60Si2Cr弹簧钢的奥氏体连续冷却转变曲线,结合金相-硬度法对其组织转变和硬度进行了分析.结果表明,当冷却速度小于2.00℃/s时,得到铁素体+珠光体混合组织;当冷却速度在3.50～20.00℃/s时,得到马氏体+珠光体混合组织;冷却速度大于20.00℃/s时,只有马氏体组织,冷却过程中不产生贝氏体组织.随着冷却速度加大,铁素体消失,珠光体含量增加,最后才出现马氏体组织,且随着冷却速度的增加,组织逐渐细化,硬度逐渐提高.更多还原

【Abstract】 The continuous cooling curving of Austenite in Ni-Cu-Nb60si2Cr spring steel is measured by DIL805 L dilatometer, and its microstructure hardness analyzed by metallographic hardness method. When the cooling rate is less than 2.00℃/s, ferrite and pearlite can be obtained; while the cooling rate is 3.50～20.00℃/s, martensite and pearlite can be obtained; and when the cooling rate is greater than 20.00℃/s, only martensite obtained without bainite.The increase of cooling rate helps with increase or appearance of pearlite and martensite, but disappearance of ferrite. Likewise, cooling rate increases the refinery and hardness of the structures.更多还原