【摘 要】
：
Microstructure evolution during deformation of undercooled austenite at 760 ℃ was investigated in Nb-microalloyed steel by using SEM (scanning electron microsc
【机 构】
：
State Key Laboratory for Advanced Metals and Materials,Materials Science and Engineering School
论文部分内容阅读
Microstructure evolution during deformation of undercooled austenite at 760 ℃ was investigated in Nb-microalloyed steel by using SEM (scanning electron microscope),TEM (transmission electron microscope),and EBSD (electron backscattered diffraction).It is indicated that during deformation-enhanced ferrite transformation (DEFT) in Nb-microalloyed steel,the incubation period is prolonged,and the higher strain is needed to accomplish ferrite transformation.Therefore,the transformation kinetics curves move to high strain parallelly; and the transformation kinetics curves of Nb-microalloyed steel can be divided into three stages.At the first stage,the solute drag effect of Nb and the consumption of strain energy for the dynamic precipitation of Nb(CN) led to a long incubation period,and at the second stage,ferrite transformation was accelerated significantly and fine Nb(CN) precipitates restrict the grain growth of ferrite effectively.The results also showed that DEFT in Nb-microalloyed steel is still a nucleation dominated process,and during the microstructure evolution the interchange of and texture was obtained.
其他文献
A new analysis based on Airy stress function method is presented for a functionally graded piezoelectric material cantilever beam.Assuming that the mechanical a
A sensitive and selective kinetic spectrophotometric method for the determination of Ⅴ(Ⅴ) was developed based on the catalytic oxidation of thionine by KBrO3
A new sufficient conditions for the global exponential stability of the equilibrium point for delayed cellular neural networks (DCNNs) is presented. It is shown
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
Theoretical calculations are performed to study the nature of the hydrogen bonds in complexes HCHO…HNO, HCOOH…HNO, HCHO…NH3, HCOOH…NH3, HCHO…NH2F and HCOOH
The finite strip controlling equation of pinned curve box was deduced on basis of Novozhilov theory and with flexibility method, and the problem of continuous c
The effects of Ce and Ti additions on the microstructures and mechanical properties of an Al-Cu-Mg-Ag alloy have been studied. It has been shown that either Ce
The photooxidation damage of lysozyme under 315-375 nm irradiation in the presence of riboflavin was studied by using sodium dodecyl sulfate-polyacrylamide gel
Based on the commercial CFD software CFX-4.3, two-phase flow of electrolyte in 156 kA drained aluminum reduction cells with a new structure was numerically simu
Four optimal approaches of high-order finite-impulse response(FIR)digital filters were developed for designing four types filters using neural network algorithm