Calculating Model of Mean Strain in Rod Rolling Process

Kim

et al. 2000

Metals and Materials

Self Cite

This paper presents an experimental study that investigates the validity of the analytical model [9] for predicting the mean effective strains associated with bar (or rod) rolling. Designed for this purpose were plate and bar rolling experiments which consist of a four-pass groove (oval and round) rolling sequences, which have material at each pass that experience the same amount of mean effective strain. The microstructure and mechanical behaviors of specimens acquired from two types of roiling experiments at 650~ were compared. A parallelism between the mechanical behaviors of a plate-rolled specimen and a bar-rolled specimen has tx~en found at each pass. We therefore concluded that the analytical model has the underlying rationale to be used in the analysis of the rod (or bar) rolling process.

Section: Calculation Of Mean Effective Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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See 3 more Smart Citations

An experimental study of the mean effective strain in rod (or bar) rolling process

Lee

Kim

et al. 2000

Metals and Materials

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A study of the influence of strain path change on the microstructure and mechanical properties of low carbon steel using plate and bar rolling

Lee

2001

Met. Mater. Int.

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This paper presents an experimental study of the effect of strain path changes with reference to rolling. The fundamental idea considered is to utilize the characteristics of plate rolling and bar rolling. Plate rolling is characterized as monotonic compressive loading while bar rolling is characterized as cross compressive loading. A four-pass plate rolling and bar rolling experiment was designed so that the material experiences the same amount of strain at each pass during rolling. The rolling experiment was carried out at moderately high temperatures (450, 550 and 650 o C). The microstructures and mechanical properties of a low carbon steel acquired from two types of rolling experiments were compared. The results revealed that the differences in strain path attributed to monotonic loading (plate rolling) and cross loading (bar rolling) significantly influenced microstructures and mechanical properties.

A study of the effect of the deformation parameters on recrystallization behavior in the rod rolling process

Yoo

Choo

2000

Metals and Materials

Rod rolling is a process in which the deformation of the workpiece between the work rolls is quite different from the rod drawing process, but the area strains (natural logarithm of area reduction ratio) multiplied by a constant have been used in the calculation of the pass-by-pass evolution of austenite grain size in rod (or bar) rolling without any verification. Considering that the deformation parameters (strain and strain rate) at a given pass play a crucial role in determining recrystallization behavior, the calculation method for the deformation parameters associated with rod rolling should be examined. In this study, a series of numerical simulations has been carded out using an area strain model [5] and an analytic model [6] which calculate the pass-by-pass strain in the rod rolling process, focusing on the effect of the calculation method for the pass-by-pass strain on the recrystallization behavior and evolution of AGS (austenite grain size) during a given pass. These have been investigated for a six-pass rolling sequence (oval-round or round-oval) designed for this study by incorporating the recrystallization and AGS evolution model being widely used in hot rolling. It was found that the re, crystallization behavior and evolution of AGS during a given pass were significantly influenced by the calculation methods for deformation parameters. The area strain model lacks mathematical grounds to be used as input to the equations for recrystallization and AGS evolution.