Modelling Microstructure and Its Effects during Multipass Hot Rolling.

Hot Deformation of Austenitic Stainless Steel Type 316 up to Strain Rates of 100 s-1

“…The rolling schedule typical of each of these products can be described in terms of a few processing variables such as the reheating temperature and the starting grain size prior to the first pass, the temperature, reduction and strain rate given in each pass and the time spent in between passes. [1][2][3] The data can be used as inputs to computational models that take into account the microstructure evolution during and after each rolling pass in an attempt to predict the austenite grain size and accumulated strain before the initiation of transformation. Microstructure evolution equations are available in the literature for a number of alloys 4) and the state of the austenite grains during a given pass will determine, on the other hand, the rolling loads required.…”

Current Trends in Cross Wedge Rolling for Part Forming

“…And based on this prediction, to optimize the products chemistry and processing routes can also be realized. Most of the physical metallurgical models usually used are based on the concept developed by Sellars and Jonas 62) at Sheffield University. These metallurgical models are considered to consist of four models, i.e.…”

The Coupled Model of a Microstructure Evolution and a Flow Stress Based on the Dislocation Theory

“…The density of nuclei (number of nuclei per volume unit) corresponds to the grain density after full recrystallization, whereas the grains density can be easily calculated from the final grain size. The grain size after a metadynamic and a static recrystallization, as discussed elsewhere, [23][24][25][26][27][28][29][30] depends on the abovementioned parameters. According to this theory, while the deformation increases, firstly it does not cause the recrystallization or the time of recrystallization is too long.…”