Evolution of dislocation structures and deformation behavior of iron at different temperatures: Part II. dislocation density and theoretical analysis

1992 ◽  
Vol 23 (2) ◽  
pp. 545-549 ◽  
Author(s):  
Y. Lan ◽  
H. J. Klaar ◽  
W. Dahl
Keyword(s):  
Dislocation Density ◽  
Theoretical Analysis ◽  
Deformation Behavior ◽  
Different Temperatures

Determination of Recrystallization Kinetics Model of 30Cr2Ni4MoV Steel Based on Dislocation Density

2017 ◽  
Vol 263 ◽  
pp. 59-66
Author(s):  
Peng Zhou ◽  
Qing Xian Ma
Keyword(s):  
Dislocation Density ◽  
Model Comparison ◽  
Kinetics Model ◽  
Structure Evolution ◽  
Metallographic Analysis ◽  
Recrystallization Kinetics ◽  
Proposed Model ◽  
Different Temperatures ◽  
Predicted Values ◽  
Experimental Values

A new model to predict the structure evolution of 30Cr2Ni4MoV steel is proposed based on the dislocation density in this research. Hot compression of 30Cr2Ni4MoV steel is carried out on Gleeble 1500 at different temperatures from 1233 K to 1473 K with a strain rate of 0.01 s-1 and the deformed samples are immediately quenched by water to frozen the austenite structure. The recrystallization kinetics model of 30Cr2Ni4MoV steel is successfully established by inverse analysis of the flow curve based on the relation between flow stress and dislocation density. In order to validate the proposed model, comparison between the predicted values and experimental values obtained by metallographic analysis is implemented. It is shown that the predicted results agree with the experimental results well.

Analysis on Diffusion Parameters of Rolling Mill Bearing Alloy-Interface

2010 ◽  
Vol 145 ◽  
pp. 177-180 ◽  
Author(s):  
Hai Bin Li ◽  
Qing Xue Huang ◽  
Jian Mei Wang ◽  
Qin Ma
Keyword(s):  
Activation Energy ◽  
Theoretical Analysis ◽  
Rolling Mill ◽  
Experimental Results ◽  
Reaction Process ◽  
Diffusion Parameters ◽  
Different Temperatures ◽  
Bearing Alloy

In this paper, the diffusion quantity of different temperatures and unit time have been investigated basing on experimental results and theoretical analysis. The diffusing parameters of molten tin in the reaction process is investigated according to diffusing formula. The results within the range of 260～350°C indicates that the diffusing activation energy is increased with the time until the reaction ceases and it is decreased with the increasing of the temperature and substrate vacancy, but the average diffusing constant of tin increased with the temperature.

Unusual Plastic Deformation Behavior in Lath Martensitic Steel Containing High Dislocation Density

2017 ◽  
Vol 905 ◽  
pp. 46-51
Author(s):  
Stefanus Harjo ◽  
Takuro Kawasaki ◽  
Yo Tomota ◽  
Wu Gong
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Lath Martensite ◽  
Strengthening Mechanism ◽  
High Dislocation Density ◽  
Random Arrangement ◽  
Plastic Deformation Behavior ◽  
In Situ Neutron Diffraction

To understand the strengthening mechanism of a metallic material with high dislocation density, the plastic deformation behavior of lath martensite was studied by means of in situ neutron diffraction measurements during tensile deformations using a 22SiMn2TiB steel and a Fe-18Ni alloy. The characteristics of dislocation were analyzed and were discussed with the relation of stress-strain curves. The dislocation densities (ρ) induced by martensitic transformation during heat-treatment in both materials were found to be originally as high as 1015 m-2 order, and subsequently to increase slightly by the tensile deformation. The parameter M value which displays the dislocation arrangement dropped drastically at the beginning of plastic deformation in both materials, indicating that the random arrangement became more like a dipole arrangement.

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