Paper Title:
Precipitation Kinetics of Aluminium Nitride in Austenite in Microalloyed HSLA Steels
  Abstract

In this work, the thermodynamic information on aluminium nitride formation and experimental precipitation kinetics data are reviewed. A revised expression for the Gibbs energy of AlN is developed with special emphasis on microalloyed steel. Using the software package MatCalc, computer simulations of AlN precipitation kinetics are performed and compared to several independent experimental results from literature. To mimic the geometrical arrangement of AlN precipitates along austenite grain boundaries, a new model for precipitation at grain boundaries is used, which takes into account fast short-circuit diffusion along grain boundaries as well as the slower bulk diffusion of atoms from inside the grain to the grain boundaries. This is essential for the calculation of AlN precipitation in austenite where nucleation occurs predominantly on grain boundaries. By studying the AlN precipitation at grain boundaries numerically, and by comparison with experimental data, it is demonstrated that the precipitation kinetics of AlN differs significantly from the simulated precipitation kinetics of randomly distributed precipitates assuming spherical diffusion fields.

  Info
Periodical
Materials Science Forum (Volumes 636-637)
Edited by
Luís Guerra ROSA and Fernanda MARGARIDO
Pages
605-611
DOI
10.4028/www.scientific.net/MSF.636-637.605
Citation
R. Radis, E. Kozeschnik, "Precipitation Kinetics of Aluminium Nitride in Austenite in Microalloyed HSLA Steels ", Materials Science Forum, Vols. 636-637, pp. 605-611, 2010
Online since
January 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Woo Gwang Jung, Hoon Kwon
Abstract:BN/Al(-Mg) metal matrix composite (MMC) was fabricated by the pressureless infiltration technique. The phase characterizations of the...
301
Authors: Dong Bok Lee
Abstract:Metal matrix composites (MMCs) consisting of an Al matrix reinforced with initially added BN particles and newly formed AlN dispersoids were...
657
Authors: Qing Tao, Yan Wei Sui, Sun Zhi, Wei Song
Chapter 3: Optical and Electronic Materials
Abstract:AlN and TiN thin films are widely used in electronic devices and acoustic material and other fields because of its unique merit, the...
274
Authors: Gui Li Yin, Deng Li Yi, Cheng Lin
Abstract:Based on the empirical electron theory of solids and molecules (EET), the phase interface electron structure of...
151
Authors: Peng Liu, Hao Ran Geng, Zhen Qing Wang, Jian Rong Zhu, Fu Sen Pan, Xiao Bin Dong
Abstract:Effects of AlN addition on the microstructure and mechanical properties of as-cast Mg-Al-Zn magnesium alloy were investigated using optical...
1095