Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation

Bin Fang; Gao-feng Tian; Zhen Ji; Meng-ya Wang; Cheng-chang Jia; Shan-wu Yang

doi:10.1007/s12613-019-1774-0

Volume 26 Issue 5

May 2019

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International Journal of Minerals, Metallurgy and Materials > 2019 > 26(5): 657-663. > DOI: 10.1007/s12613-019-1774-0

Bin Fang, Gao-feng Tian, Zhen Ji, Meng-ya Wang, Cheng-chang Jia, and Shan-wu Yang, Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp.657-663. https://dx.doi.org/10.1007/s12613-019-1774-0

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Research Article

Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation

Bin Fang¹⁾,
Gao-feng Tian²⁾,
Zhen Ji^1), ,,
Meng-ya Wang¹⁾,
Cheng-chang Jia¹⁾ and
Shan-wu Yang¹⁾

Author Affilications

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Beijing Institute of Aeronautical Materials, Beijing 100095, China

Funds:

Financial support from the National Natural Science Foundation of China (No. 51471023) and the Ministry of Science and Technology of the People's Republic of China (National 973 Program, No. 2014GB120000) are gratefully acknowledged.

Received: 13 July 2018; Revised: 14 October 2018; Accepted: 18 October 2018;

Graphical Abstract

Abstract

Abstract

The change rules associated with hot deformation of FGH96 alloy were investigated by isothermal two-pass hot deformation tests in the temperature range 1050-1125℃ and at strain rates ranging from 0.001 to 0.1 s^-1 on a Gleeble 3500 thermo-simulation machine. The results showed that the softening degree of the alloy between passes decreases with increasing temperature and decreasing strain rates. The critical strain of the first-pass is greater than that of the second-pass. The true stress-true strain curves showed that single-peak dynamic recrystallization, multi- peak dynamic recrystallization, and dynamic response occur when the strain rate is 0.1, 0.01, and 0.001 s^-1, respectively. The alloy contains three different grain structures after hot deformation:partially recrystallized tissue, completely fine recrystallized tissue, coarse-grained grains. The small-angle grain boundaries increase with increasing temperature. Increasing strain rates cause the small-angle grain boundaries to first increase and then decrease.
- FGH96 super-alloy,
- two-pass hot deformation,
- microstructure,
- grain orientation

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References (16)

References

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