Comparison of microstructure stability and corrosion resistance of nickel based alloys Inconel 740H and 617B

doi:10.13251/j.issn.0254-6051.2023.05.004

Abstract

Abstract: Nickel based superalloys Inconel 740H and 617B were aged at 750 ℃ and 780 ℃ for 5000 h, and then corroded in simulated coal-fired environment. The surface and cross sectional microstructures were characterized by TEM, EDS and SEM. The results show that the size of intragranular γ′ phase in the Inconel 740H alloy is about 5 nm before aging, while after aging at 750 ℃ and 780 ℃ for 5000 h, the average size of γ′ phase is about 70 nm and 95 nm, respectively. The intragranular γ′ phase in the 617B alloy is not observed before aging, while after aging, the γ′ phase is precipitated and grows to about 100 nm and 130 nm, respectively, which shows that the microstructure stability of the Inconel 740H alloy is better than that of the 617B alloy. The corrosion test results in simulating coal-fired environment at 750 ℃ and 780 ℃ show that the Inconel 740H alloy has better corrosion resistance than 617B alloy, so the 617B alloy cannot replace Inconel 740H alloy at present.

Key words: Inconel 740H alloy, 617B alloy, aging, microstructure stability, corrosion resistance

CLC Number:

TG146

Hou Shixiang, Liu Yan, Liu Dongyu. Comparison of microstructure stability and corrosion resistance of nickel based alloys Inconel 740H and 617B[J]. Heat Treatment of Metals, 2023, 48(5): 18-24.

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