Paper Title:
Modelling and Experiments Concerning Dendrite Re-Melting and Its Role in Microstructural Evolution in Spray Formed Ni Superalloys
  Abstract

This paper presents a combined experimental and modelling approach to understand dendrite fragmentation of atomised metal alloy droplets during deposition in spray forming, and to study quantitatively the relationship between this dendrite fragmentation behavior and subsequent microstructural evolution. A Gleeble 3500 physical simulator was used to create controlled thermal shock conditions in solid-liquid mixtures of Ni superalloy IN718 atomised powders, which simulated the environment of droplet deposition during the twin-atomiser spray forming of large diameter IN718 alloy billets at BIAM. The experiments were complemented by phase field modelling studies at Oxford. Experiment and modelling supported the hypothesis that the characteristic equiaxed spray formed microstructure depends critically upon the rapid remelting and thermal shock of fine-scale dendrites in solid particles in the spray to provide a high density of embryonic grains.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
1363-1366
DOI
10.4028/www.scientific.net/MSF.654-656.1363
Citation
Y. Zhang, Z. Guo, G. Q. Zhang, J. W. Mi, P. S. Grant, "Modelling and Experiments Concerning Dendrite Re-Melting and Its Role in Microstructural Evolution in Spray Formed Ni Superalloys", Materials Science Forum, Vols. 654-656, pp. 1363-1366, 2010
Online since
June 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: Bin Li, Qing Yan Xu, Bai Cheng Liu
Abstract:A modified Cellular Automaton model was presented to simulate the evolution of dendritic microstructure in low pressure die casting of Al-Si...
1787
Authors: H. Wang, Q. Li
Abstract:A model based on the cellular automaton (CA) technique for the simulation of solidification microstructure has been developed. An improved...
271
Authors: Hsiun Chang Peng, Long Sun Chao
Abstract:Rather than designated directly as solid if the micromesh (or cell) larger than a nucleus is chosen as the nucleation site, the growth of a...
22
Authors: Zhong Wei Chen, Pei Chen, Li Fan
Abstract:The Dendrite Coherency Point (DCP) of A357 alloy was determined after different melt treatments by double thermocouples, and the coherency...
3886
Authors: Heng Min Ding, Tie Qiao Zhang, Lv Chun Pu
Chapter 10: Alloys, Steel Materials and Technologies
Abstract:In the paper, a model basing on solute conservative in every unit is developed for solving the solute diffusion equation during...
870