Effect of Heating Temperature on the Grain Size and Titanium Solid-Solution of Titanium Microalloyed Steels

Jianjing Wang,Caishui Yang,Yuexiang Wang,Yonglin Kang

doi:10.4236/msa.2019.108040

Jianjing Wang, Caishui Yang + Show 2 more

Open Access

https://doi.org/10.4236/msa.2019.108040

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Abstract

Through studying on the heating process of titanium microalloyed steels, the influence of heating temperature on the austenite grain size and the solid dissolution, precipitation law of Ti microalloying element were analyzed, and the results showed that, the austenite grain size increased with the increase of heating temperature, When the heating temperature reached 1050°C and 1250°C, the austenite grains appeared the obvious coarsening process twice. TiC particles dissolved gradually as the heating temperature increased. When the heating temperature rose to 1100°C, TiC particles disappeared basically, When the heating temperature rose to 1250°C, TiN particles began to be dissolved and grow up.

Highlights

In the rolling process of titanium microalloyed steels, the heating system has an important effect on the original austenite grains and solid solution of Titanium microalloying
Through studying on the heating process of titanium microalloyed steels, the influence of heating temperature on the austenite grain size and the solid dissolution, precipitation law of Ti microalloying element were analyzed, and the results showed that, the austenite grain size increased with the increase of heating temperature, When the heating temperature reached 1050 ̊C and 1250 ̊C, the austenite grains appeared the obvious coarsening process twice
The austenite grain size prediction model can be expressed by the following formula: R = A·r ƒ

Summary

Introduction

In the rolling process of titanium microalloyed steels, the heating system has an important effect on the original austenite grains and solid solution of Titanium microalloying. The study on the heating process of titanium microalloyed steels and the establishing of a reasonable heating system has an important influence on the controlled rolling and cooling processes. Through further analysis on the Zener model [1], Gladman [2] And Hillert [3] studied the effect of precipitation particles on the size of austenite grains, and proposed a method for predicting the size of austenite grains. The growth of austenitic grain size for the microalloyed steels with Ti content of 0.05% were studied in the paper

Test Materials and Methods

Effect of Heating Temperature on Austenite Grain Size

Analysis and Discussion

Conclusions