Grain Refinement of GH4169G Alloy by the Combination of Heat Treatment and Cold Deformation

Abstract:

The precipitating behavior of δ phase in GH4169G alloy at 910°C was investigated and a novel process for achieving fine-grained GH4169G sheet with average grain size of ASTM13 was proposed. Globular δ phase precipitation precedes that of the plate-like δ phase, forming at grain boundary first and later in grain. After globular δ phase reaches a peak volume, it begins to transform into plate-like in grain boundary, and then the plate-like δ phase forms in grain in certain direction. The grain-fined process includes the following steps:(1) solution treated at a proper temperature, then air cooled; (2) soaked for δ phase precipitation; (3) cold rolled; (4) annealed for recrystallization. Microstructure analysis from optical microscopy (OM) and scanning electron microscopy (SEM) revealed that both plate-like and globular δ phase remarkably restrained the grain growth during annealing recrystallization. The optimum parameters for the grain refinement were determined finally.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 543-548
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.543
• Online since: April 2014
• Authors: Lin Jie Huang, Feng Qi, Wen Ru Sun, Pei Tao Hua, Fang Liu, Lian Xu Yu, Xin Xin, Zhuang Qi Hu
• Keywords: Annealing Crystallization, Cold Rolled, GH4169G, Grain Refinement, δ Phase

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