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含碳0.04~0.13%的钢在1220~750℃温区轧制后空冷,调查其显微组织及机械性能。钢的晶粒度最初随轧制温度的降低而细化,但随着轧制温度进一步降至铁素体区,晶粒度又迅速增大。显微组织越粗和粗细不均,则完成的奥氏体化道间再结晶越少,而轧制时存在于钢中的铁素体越多。在铁素体区轧制会产生明显的拉伸延展性各向异性。
Steel containing 0.04-0.13% of carbon was air-cooled at a temperature of 1220-750 ° C and investigated for its microstructure and mechanical properties. The grain size of steel is initially refined as the rolling temperature decreases, but as the rolling temperature further decreases to the ferrite zone, the grain size increases rapidly. The coarser the microstructure and the more uneven the thickness, the less recrystallization occurs in the completed austenitizing pass and the more ferrite present in the steel during rolling. Rolling in the ferrite zone produces pronounced tensile ductility anisotropy.