Jominy end quenching test were carried out on 52CrMoV4 large specification leaf spring steel to investigate the effects of normalizing pretreatment at 900 ℃ for 1 h and austenitizing at 850 ℃ and 900 ℃ on Jominy end quenching characteristic of the 52CrMoV4 leaf spring steel.The results show that the end-quenching hardness of hot-rolled steel after austenitizing at 850 ℃ is lower and banded microstructure is more obvious and the end-quenching curve fluctuates greatly,which can reflect the uniformity of chemical composition distribution to some degree.Hot-rolled steel austenitized at 900 ℃ can reach higher hardness and normalizing before quenching can stabilize the overall hardness of 52CrMoV4 leaf spring steel.During 52CrMoV4 steel leaf spring manufacturing process,900 ℃ austenitizing temperature is adopted to acquire higher hardness around 60 HRC,displaying better quenching properties.
leaf spring steelhardenabilitymicrostructure uniformityhardness
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