A microstructural evaluation technique for deformation studies in metal forming processes

✍ Scribed by B.O. Oyekanmi; T.A. Hughes; A.N. Bramley

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 807 KB
• Volume: 21
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/0924-0136(90)90031-o

✦ Synopsis

It is sometimes necessary to estimate the amount of plastic deformation resulting from a particular forming operation, or to estimate the strain distribution within the workpiece. Many analytical methods have been developed which attempt to provide this information, but it is difficult to obtain experimental evidence of their validity. Split gridded billets, for example, are not always suitable because they cannot sustain circumferential stresses. In any case, the interpretation of the distorted grids is not easy.

This paper describes an experimental technique which is generally applicable to the evaluation of strain in metal-forming processes, where information on the distribution and accumulation of strain within the workpiece at any stage during the deformation process can be obtained. Since recrystaUized grain size is a function of the amount of prior deformation, it can be used as a means of determining the strain distribution. This paper demonstrates how the technique can be used with commercially pure aluminium, and how it can be applied to closed die forging.