Determination and analysis of TTT curve of 38MnVTi non-quenched and tempered steel
This paper studies austenite transformation products of 38MnVTi non-quenched and tempered steel during isothermal cooling and the relations between transformation amount and time.The expansion curves of different isothermal temperatures are obtained by Gleeble-1 500D thermal simulation tester.The expansion curves at different isothermal temperatures are acquired by expansion method on Gleeble-1 500D thermal simulation testing machine.The isothermal transformation curve(TTT curve)of 38MnVTi non-quenched and tempered steel is calculated and fitted by Origin software.Our results show the precipitation temperature of cementite is 750 ℃,the ferrite precipitation temperature 840 ℃,the martensite precipitation temperature 360 ℃ and the martensite transformation termination temperature 212 ℃.Under the isothermal cooling conditions of 540,510,480 and 430 ℃,the maximum transformation amounts of bainite are 16.9％,26.8％,38.5％and 55.3％,respectively.
non-quenched and tempered steelTTT curveexpansion methodthermal simulation
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