Abstract
A model to quantitatively predict ferrite (α) textures in hot-rolled steel sheets has been developed. In this model, the crystal plasticity model, called “Grain Interaction model (GIA)”, and the transformation texture model, called “Double K-S relation (DKS)”, are linked together. The deformed austenite (γ) texture is predicted by GIA with taking not only the standard {111}<110> slip system but also non-octahedral slip systems into account. Then the transformed a texture is calculated by DKS, in which a nucleated α prefers to have orientation relationship near the Kurdjumov-Sachs relation with both of two neighboring γ grains. For validation, single pass hot-rolling tests on a C-Si-Mn steel were carried out. The comparison between the predicted and the experimental textures shows that the linked model (GIA & DKS) can lead to a remarkable reproduction of the texture of hot-rolled steel sheets.
Highlights
It is important to understand the texture development during hot-rolling processes because the texture strongly influences the material properties, and the texture of hot-rolled steel is known to largely influence the texture even after cold-rolling and annealing
The transformed α texture is calculated by Double K-S relation (DKS), in which a nucleated α prefers to have orientation relationship near the Kurdjumov-Sachs relation with both of two neighboring γ grains
For instance it was reported that the Taylor-type crystal plasticity model, such as “Grain Interaction model (GIA) [1]” in which the interaction of the deformation of neighboring grains can be considered, could make a reasonably quantitative prediction for the deformation texture of cold-rolled fcc alloys [2]
Summary
It is important to understand the texture development during hot-rolling processes because the texture strongly influences the material properties, and the texture of hot-rolled steel is known to largely influence (or inherited to) the texture even after cold-rolling and annealing. There is still much difficulty in predicting the texture development throughout the manufacturing process, since the influence of deformation and recrystallization of γ as well as phase transformation from γ to α on the texture evolution have not been thoroughly clarified. GIA and DKS have been linked together to construct the through-process prediction model for hot-rolling processes in which deformed γ directly transforms to α without recrystallization, and the model has been experimentally examined. To avoid recrystallization of γ, the finish-rolled steel sheets were cooled immediately to 750°C at a rate of about 1000°C s-1 to promote precipitation of α They were kept at 400°C for 10 minutes to promote bainite transformation and stabilize the retained γ.
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