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| Effect of tempering temperature on microstructure and properties of medium carbon alloy steel 4Cr5MoSiV1Nb |
| LIN Guo-biao， ZHAO Pan， AO Wei |
| （School of Materials Science and Engineering， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract The effect of tempering temperature on microstructure and properties of medium carbon alloy steel 4Cr5MoSiV1Nb was studied in order to optimize properties of the alloy. The results show that the secondary hardening temperature of 4Cr5MoSiV1Nb alloy steel ranges from 300-550 ℃ and the peak value appears at 550 ℃. The hardness of 4Cr5MoSiV1Nb steel reaches 56.3HRC and meanwhile，its impact toughness decreases markedly. The reason for the decrease of impact toughness is that the fine and short bar cementite containing Cr precipitates at grain boundary during tempering. It can be speculated that reducing the segregation of Cr in its parental quenched alloy steel will reduce the precipitation at grain boundaries of the tempered alloy and improve its impact toughness. The addition of trace Nb forms strengthening particles of （V，Nb）C phase. The alloy tempered at 250-350 ℃ can reach the best comprehensive properties higher than 15 J/cm2 impact toughness and 55HRC hardness.
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Received: 29 September 2018
Published: 09 May 2019
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2019, Vol. 54 
