Abstract
Mechanical and fluid assisted (hydro-mechanical) deep drawing operations were performed on drawing quality (DQ) and interstitial free (IF) steels at various forming depths. The evolving microstructure in terms of textural developments, in-grain misorientations and residual stresses measurements were significantly different between the two grades and deep drawing processes. In all the deformed microstructures, however, clear formation of near boundary gradient zones (NBGZs) was observed, quantified from electron backscattered diffraction (EBSD) data. The effective presence and extent of the NBGZs appeared to be the primary source of differences in deformed microstructure developments leading to changes in strain distributions between two different forming processes. It was observed that the formation of NBGZ was lower in hydro mechanical deep drawing (HMDD) operations. Moreover, the estimated statistical parameter strain non-uniformity index (SNI) confirmed the development of uniform strain distributions during HMDD operations. The determined correlation coefficient R2 values showed best fit for HMDD operations.
Published Version
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