Abstract：The high temperature plasticity of 30MnVS was measured by Gleeble 3800 thermal simulator, when the sample was broken, it was sprayed with water and cooled rapidly;then the fracture was observed by JMS-6490 scanning electron microscope, the section shrinkage curve, tensile strength curve and stress-strain curve were drawn using 0rigin8.0 drawing software,Microstructure near the fracture of the spray-cooled sample was observed using a Zeiss metallurgical microscope. The results showed that the temperature range of the third brittle zone of 30MnVS steel was 650-900 ℃,since manganese sulfide, vanadium carbide, etc. was precipitated at the austenite grain boundary, the formation of the ferrite film was promoted. The reticulated ferrite film deposited along the austenite grain boundaries was the main reason for the presence of the brittle zone. In actual production, straightening should be carried out above 900 ℃ in order to effectively reduce cracks caused by straightening.
ZHAO X M,MAO X Y,CAI L,et al.Effect of controlled cooling after forging on intragranular ferrite and toughness for a 38MnVS steel[J].Transactions of materials & Heat trestment,2013,34(11):114.
2020, Vol. 39 
