By Mei Li, Carelyn Campbell, Katsuyo Thornton, Elizabeth A. Holm, Peter Gumbsch
This ebook represents a suite of papers offered on the 2d global Congress on built-in Computational fabrics Engineering (ICME), a forte convention geared up by way of The Minerals, Metals & fabrics Society (TMS), and held in 2013.
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28 Before machining Part iMI in B'liri Fig. 3 The mesh for a cylindrical extrusion billet and a Final machined compressor wheel Fig. 4 Residual stress evolution in quenching and machining processes (no stretching) S. fi . / 1* • 171 67 | 3J W W i "*"*" «*P After quenching ' Symmrlric BC m lot rhu end \ Fig. 5 Residual stress evolution in quenching, 1% stretching and machining processes 100 MPa Befoie machlntng Part mil m biitel Fig. 6 Residual stress evolution in quenching, 2% stretching and machining processes 29 Summary A computational model for residual stress analysis has been used in aluminum wrought alloy to understand and optimize heat treatment and stretching processes.
In this paper, however, the possibilities of using ICME to achieve a higher process stability and reliability are documented. Especially for aluminum and its alloys, very early process stages, such as the pre-heating before hot rolling already take severe influence on processability and final properties of the strip. Two industrial cases were calculated. In hot rolling it was shown, that the condition of the alloy combined with non-optimal processing parameters can lead to failures of coils after winding.
Thus an accurate representation of the material behavior at different temperatures and strain rates is extremely important to the simulation results. To accurately predict the residual stress and distortion during quenching, the temperature- and strain rate-dependent material constitutive behavior needs to be modeled. Following Newman et al, a material constitutive model called Mechanical Threshold Stress (MTS), was adapted in this work for water quenching process . A. MATERIAL CONSTITUTIVE MODEL During quenching, the total thermal strain can be simply divided into elastic and plastic strains.