Dislocation microstructures in steel during deep drawing

Abstract Simple and complex loadings are performed on low-carbon steel sheets in order to simulate deep drawing. The loading include uniaxial tension, plane strain, equibiaxial stretching, uniaxial tension followed by equibiaxial stretching, and reverse sequence. As the strain is increased dislocations tend to arrange themselves in walls delimiting cells of material in which the dislocation density is low. The cell shape and its evolution depend on the strain and the strain path. Some geometrical parameters (cell size, wall thickness) and wall orientation measurements allow the microstructure to be characterized. In each grain, dislocation walls appear to be connected with active slip planes. Cell size and wall thickness decrease with increasing strain along any strain path. During complex loadings the dislocation microstructure that develops is typical of the last loading path rather than the previous one.

[1]  J. M. Jalinier,et al.  Damage in sheet metal forming—I. Physical behavior , 1982 .

[2]  J. M. Jalinier,et al.  Damage in sheet metal forming—II. Plastic instability , 1982 .

[3]  D. Kuhlmann-wilsdorf,et al.  Low-energy dislocation cell structures produced by cross-slip , 1982 .

[4]  M. Hatherly.  Deformation at High Strains , 1982 .

[5]  U. F. Kocks,et al.  Kinetics of flow and strain-hardening☆ , 1981 .

[6]  P. Franciosi,et al.  Latent hardening in copper and aluminium single crystals , 1980 .

[7]  F. Prinz,et al.  Dislocation cell formation during plastic deformation of copper single crystals , 1980 .

[8]  P. Van Houtte,et al.  Large strain work hardening and textures , 1980 .

[9]  André Zaoui,et al.  An extension of the self-consistent scheme to plastically-flowing polycrystals , 1978 .

[10]  B. Baudelet,et al.  Microstructure and strain path in deep-drawing , 1977 .

[11]  A. Thompson.  Substructure strengthening mechanisms , 1977 .

[12]  A. Matsuda.  The Plastic Deformation of Iron Single Crystals with Shear Tests in {110}〈111〉 and {112}〈111〉 Slip Systems , 1977 .

[13]  K. Maruyama,et al.  An Analysis of Cell Formation due to Plastic Deformation Based on Dislocation Theory , 1974 .

[14]  D. Kuhlmann-wilsdorf,et al.  Stresses of dislocation cells , 1972 .

[15]  D. L. Holt,et al.  The Dislocation Cell IZE AND Dislocation Density in Copper Deformed at Temperatures between 25 and 700 Degrees C. , 1972 .

[16]  D. L. Holt,et al.  Dislocation Cell Formation in Metals , 1970 .

[17]  T. Takeuchi.  Work-Hardening of Iron Single Crystals between 25°C and 900°C , 1970 .

[18]  Y. Taneda,et al.  Correlation between Work Hardening and Dislocation Structure in Iron Crystals Deformed in Tension at 198°K and 293°K , 1970 .

[19]  S. Ikeda.  Dislocation Distribution and Work-Hardening in Iron Single Crystals Extended in the [100] and the [110] Axes , 1969 .

[20]  D. Dingley,et al.  Components of the flow stress of iron , 1967 .

[21]  U. F. Kocks.  A statistical theory of flow stress and work-hardening , 1966 .

[22]  A. Keh.  Work hardening and deformation sub-structure in iron single crystals deformed in tension at 298°k , 1965 .