GAO Weilin.BAI Guangrun
,
ZHOU Zhimin
,
LUAN Guifu Northeast University of Technology.Shenyang
,
ChinaLONG Chunman Anshan Iron and Steel Company
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China Lecturer
,
Post Box No.92.Northeast University of Technology.Shenyang 110006
,
China
金属学报(英文版)
Experimental investigation of hot deformation behaviour of Nb-bearing low carbon steel 14MnNb was carried out by Gleeble 1500 simulator.Regressive analysis was made of the re- lationship between deformation onditions and steady state flow stress during hot deformation and the peak fliw stress corresponding to dynamic recrystallization.Clarification was also described for the influence of strain-induced Nb(C.N)precipitation on the activation energy of deformation.On the basis of analyzing the processes of dislocation multiplication and re- coveries from cross-slip of screw dislocation and from climb of edge dislocation during plastic deformation of metals.the theoretical mpdel to predict flow stress under the condiltions of dy- namic recorery and recrystallization occirred simultancously was developed,The prediction about flow stress in practice,under various deformation conditions by the model seems in fair agreement with the experimental results.
关键词:
flow stress
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