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| Characteristics of Phase Transformation in 4Cr16Mo Steel and 4Cr16MoN Steel |
| YUAN Sen1,WU Xiao��chun1,ZHUANG Yu��jian1,ZHANG Hong��kui2,LUO Yi1 |
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Abstract The large��scale production and heat treatment of 4Cr16MoN steel are provided by the equilibrium phase diagram and CCT curve of steel. The equilibrium phase diagram of 4Cr16MoN and 4Cr16Mo steel are calculated By J��Matpro simulation software. Then the CCT curves are measured by DIL805A phase change thermal expansion. Here are the test conditions:1 050 ��/s austenite, holding 5 min,cooling based on 10��3��1��2��1��0��5��0��1��0��08��0��05��0��03 ��/s. The results showed that: in calculated equilibrium phase diagram of the two test steels, over a wide high temperature range the steel was maintained to be single��phase austenite, not δ ferrite; Two experimental CCT curves of the steels have independent pearlite and bainite regions; The critical cooling rate of P and B of 4Cr16MoN steel is 0��1 ��/s and 1��2 ��/s respectively, while the critical cooling rate of P and B of 4Cr16Mo steel is less than 0��03 ��/s and 3 ��/s.
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Received: 18 January 2011
Published: 11 July 2011
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2011, Vol. 29 
