RE heavy rail steel recrystallization behavior during hot rolling and microstructure evolution of the law
Everbeen magnets supply you the rare earth magnets such as neodymium magnets,ceramic magnets,which is the strongmagnets and permanent magnets.and rubber magnets,fridge magnets,Refrigerator Magnets etc.
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In this paper, U71Mn, U75V and RE Ⅱ heavy rail as the research object, by adding rare earth smelting tests, using GLEEBLE-1500D thermal simulation testing machine, high temperature tensile test and re-crystallization of thermoplastic compression test.Test steel smelting of rare earth elements is added in the U75V observe the rare earth inclusions in heavy rail steel microstructure.The results showed that the addition of rare earth can change the amount of inclusion morphology, particle size reduction and dispersing to distribution, refined pearlite spacing.In the high temperature thermoplastic trial, the temperature variation of the plastic segment and micro-alloying elements V, Nb and RE on the heavy rail temperature thermoplastic impact, comparative analysis of the tensile specimen fracture surface.The results show that the first Ⅰ brittle zone (1200 ℃ ~ 1300 ℃), the plastic of the steel is very low, close to zero; the first plastic zone Ⅱ (850 ℃ ~ 1200 ℃), good plasticity; section Ⅲ brittle zone (850 ℃ the following), the plastic down.
V for heavy rail steel in the temperature region of brittle plastic Ⅲ have a greater impact.Section shrinkage curve shows, U75V the area reduction was less than the corresponding values of RE Ⅱ, indicating that an appropriate amount of rare earth elements in the austenite grain size is small, is conducive to improved performance.Single-pass compression test method, the Gleeble-1500D thermal simulator for U71Mn, U75V and RE Ⅱ simulation test.
By comparing the different deformation conditions in the true stress - true strain curve and the RTT curves of deformation conditions, micro-alloying elements on the U71Mn, U75V and RE Ⅱ dynamic recrystallization.The results showed that the higher the deformation temperature, strain rate, the lower, dynamic recrystallization occurred more easily; the microalloying elements V, RE role so U75V, RE Ⅱ dynamic recrystallization start time extended dynamic recrystallization of deformed austenitethe name of crystallization activation energy increased, the dynamic recrystallization of austenite can serve to.Based on the true stress - true strain curve, calculated U71Mn, U75V and RE Ⅱ dynamic recrystallization activation energy Q, temperature compensated strain rate factor Z values to verify the micro-alloying elements on the heavy rail dynamic recrystallization.By U75V and RE Ⅱ single pass and double-pass compression simulations to determine the two steel at different deformation conditions, the true stress - true strain curve and isothermal deformation at different passes clearance time, the softening rateto study the deformation conditions on the static recrystallization effects of static recrystallization were studied.Based on a single pass and double pass to adjust the deformation parameters and to develop multi-pass deformation process, inhibit the occurrence of static recrystallization and control the occurrence of dynamic recrystallization, austenite grain size refinement, to effectively improve the mechanical steelperformance.
Everbeen magnets supply you the rare earth magnets such as neodymium magnets,ceramic magnets,which is the strongmagnets and permanent magnets.and rubber magnets,fridge magnets,Refrigerator Magnets etc.
Xiamen Everbeen Magnet Electron Co.,Ltd. http://www.chinamagnets.biz
Add:Unit H, 4F Rihua Mansion, No. 8 Xinfeng 2nd road, Torch Hi-Tech Zone, Xiamen, China.
Tel:0086-592-5781916
Fax:0086-592-5123653
E-mail:sales@china-magnet.net
