不同冷却速度对PQ600组织的影响

Different Cooling Rate on the Impact of the Organization PQ600

采用膨胀法测定机械工程用的高强度PQ600Nb-Ti微合金化钢的CCT曲线,采用金相显微镜观察不同冷速下的显微组织。分析发现:当冷速低于10.00℃/s,得到的组织为铁素体(F)+珠光体(P);中速冷却时(冷速大于16.67℃/s),得到的组织为比较细小的铁素体(F)+贝氏体(B);高速冷却时(冷速大于40.00℃/s),铁素体(F)+贝氏体(B)组织进一步细化,且贝氏体组织为板条状。

Determinate the CCT of high-intensity PQ600Ni-Ti-alloy steel use for Mechanical Engineering by Expansion, Metallographic microscope was analysised using different cooling rate under the microstructure. Analysis： in cooling rate lower than the 10.00℃ / s, by the Organization for ferrite （F） ＋ pearlite （P）; medium-speed cooling （cooling rate higher than 16.67℃/s）, the organization received for the relatively large ferrite （F） ＋ Pui＇s Body （B）; rapid cooling when the （cooling rate higher than 40.00 ℃ / s）, ferrite （F） ＋ bainite （B） further refinement. Further use of scanning electron microscopy analysis of microstructure, found a large quantity of lath bainite organizations.