B.Zhang
,
H.B.Zhang
,
X.Y.Ruan
,
Y.Zhang
金属学报(英文版)
The isothermal single-stage compression of 35CrMo stuctural steel has been carried out by using Gleeble 1500 simulator at the temperature range of 950℃ to 1150℃ and strain rate range of 0.01s^-1 to 10s^-1.The effect of hot deformation parameters,such as strain rate,deformed temperature and initial grain size on the flow stress behavior was investigated.The activation energy of tested alloy was calculated,which is 378.16kJ/mol;The relationships between the peak stress(σp),the peak stain (εp),the critical strain(εc)and Z parameter were established.The microstructure evolution shows the pre-existing austenite grain boundaries constitute the principal nucleation sites for dynamic recrystallization (DRX),and the initial austenite grain size affects the grain size of DRX slightly.The kinetic mathematical model of DRX of 35CrMo is:XDRX=1-exp(-3.23·(ε-εc/εs-εc)^2.28)and Ddyn=2.252×10^4Z^-0.22。
关键词:
dynamic recrystallization
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null
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null
X.P.Lin
,
Y.Dong
,
X.M.Cao
,
Y.Zhang
,
N.J.Gu
,
X.L.Ma
金属学报(英文版)
Habit plane rotation of lath martensite transformation in Fe-Ni-Mn alloy was predicted by means of Displacement Vector Theory. Its surface relief effect was observed and a math model for the quantitative analysis of habit plane rotation of lath martensite transformation was established by means of atomic force microscopy (AFM). The experiment showed that the largest rotation of habit plane of lath martensite transformation predicted by means of Displacement Vector Theory is 13.50°, and it's incompatible with the concept of invariant plane strain (IPS); surface relief of lath martensite revealed no character of IPS, i.e. it exhibited irregular “N”-shaped “surface relief packet”, and “surface relief packet” was composed of layers of several small surface reliefs, the AFM quantitative analysis of habit plane rotation of lath martensite transformation was 11.11°, which was in agreement with the prediction of Displacement Vector Theory (13.50°) and it firmly confirmed the habit plane rotation of lath martensite transformation and the correctness of Displacement Vector Theory.
关键词:
atomic force microscope (AFM)
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null
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null
