Specific Features of Static, Impact, and Fatigue Fracture of the 0.09%C-0.08%Mo-0.03%Nb-0.06%V Steel with Ultrafine-Grained Structure

L.R. Botvina; Marat R. Tyutin; V.P. Levin; Y.A. Demina; I.A. Panteleev; Sergey V. Dobatkin

doi:10.4028/www.scientific.net/MSF.584-586.281

Paper Titles

Applications of Differential Scanning Calorimetry on Materials Subjected by Severe Plastic Deformation
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Texture Evolution of Magnesium Single Crystals Deformed by High-Pressure Torsion
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Structure of Triple Junctions of Grains, Nanoparticles in them and Bending - Torsion in Metal Nanopolycrystals
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Workability Limits of Commercial Purity Titanium Subjected to Equal Channel Angular Pressing
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Specific Features of Static, Impact, and Fatigue Fracture of the 0.09%C-0.08%Mo-0.03%Nb-0.06%V Steel with Ultrafine-Grained Structure
p.281

Compressive Behavior of Ultrafine-Grained Mg-Zn-Y-Zr Alloy Containing Quasicrystalline Phase
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Shear Induced Low- and High-Angle Boundary Characterization Using Kikuchi Bands in Transmission Electron Microscopy
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Microstructure Evolution during High Pressure Torsion of AZ80 Magnesium Alloy
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Microstructure of a Metal-Polymer Composite Processed by Severe Plastic Deformation
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Specific Features of Static, Impact, and Fatigue Fracture of the 0.09%C-0.08%Mo-0.03%Nb-0.06%V Steel with Ultrafine-Grained Structure

Abstract:

The mechanical properties and fracture mechanisms of the 0.09%C-0.08%Mo-0.03%Nb- 0.06%V steel in the initial state and with the ultrafine-grained (UFG) structure obtained by equalchannel angular pressing (ECAP) have been estimated. The investigation included the static and cyclic tensile tests, the impact tests at room and lower temperatures with automatic recording of force-displacement diagram, and the analysis of both the fracture surface microrelief and the evolution of plastic deformation zone by replica method. It is established that the grain refinement increases the ultimate strength and yield strength, but decreases plasticity and impact toughness and raises fatigue growth rate and the critical temperature of ductile–brittle transition. The dynamic fracture toughness of the material after ECAP as compared with that of the material with the initial structure decreases due to the raising of the critical brittleness temperature.