Influence of Hot Working on Microstructure and Fatigue Property of GCr4Mo4V Steel
The high temperature bearing steel GCr4Mo4V prepared by"VIM+ESR"process was taken as research object.By adopting different forging processes,the influence of hot working on the carbide size and distribution as well as grain size of GCr4Mo4V was studied,and the influence of the distribution of carbides and grain size on the fatigue properties was further explored by rotating bending fatigue test.The results show that the increase of the total deformation and the final heat deformation is conducive to the refinement of GCr4Mo4V large carbide,and the increase of the deformation heat number can significantly improve the dispersion of carbide distribution.The increase of total forging deformation can improve the deformation energy storage of GCr4Mo4V to create conditions for recrystallization and grain refinement,reducing the deformation heat number and increasing the final heat deformation can also promote the grain size refinement.With the reduction of the carbide and grain size,the rotating bending fatigue limit of GCr4Mo4V also gradually increases,and the rotating bending fatigue limit is nearly linear with the carbide and grain size.The fatigue strength of GCr4Mo4V can be significantly improved by optimizing the forging process to achieve the refinement of large carbides and grain size,which is of great significance for improving the service performance of high temperature bearing steel.
high temperature bearing steelhot workingmicrostructurefatigue property
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