Nonisothermal Austenite Grain Growth Kinetics in a Microalloyed X80 Linepipe Steel |
| |
Authors: | Kumkum Banerjee Matthias Militzer Michel Perez Xiang Wang |
| |
Affiliation: | 1.Research & Development Department,Tata Steel Ltd.,Jamshedpur,India;2.The Centre for Metallurgical Process Engineering,The University of British Colombia,Vancouver,Canada;3.Université de Lyon, INSA Lyon, MATEIS, UMR CNRS 5510,Lyon,France;4.Materials Science and Engineering Department,McMaster University,Hamilton,Canada |
| |
Abstract: | Nonisothermal austenite grain growth kinetics under the influence of several combinations of Nb, Ti, and Mo containing complex
precipitates has been studied in a microalloyed linepipe steel. The goal of this study is the development of a grain growth
model to predict the austenite grain size in the weld heat affected zone (HAZ). Electron microscopy investigations of the
as-received steel proved the presence of Ti-rich, Nb-rich, and Mo-rich precipitates. The steel has then been subjected to
austenitizing heat treatments to selected peak temperatures at various heating rates that are typical for thermal cycles in
the HAZ. Thermal cycles have a strong effect on the final austenite grain size. Using a mean field approach, a model is proposed
for the dissolution of Nb-rich precipitates. This model has been coupled to a Zener-type austenite grain growth model in the
presence of pinning particles. This coupling leads to accurate prediction of the austenite grain size along the nonisothermal
heating path simulating selected thermal profiles of the HAZ. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|