Solution Treatment Effect On Haynes282 Heat-resistant Alloy Microstructure And Hardness

Publish Time: 06/23 2021 Author: Site Editor Visit: 14430

Haynes alloy is a Ni-Cr-Co-Mo aging-strengthened high-temperature heat-resistant alloy developed by Haynes in the United States. The alloy has good hot workability, corrosion resistance, long-term aging structure stability and excellent creep strength. , Is one of the candidate materials for the steam turbine rotor of 700℃ ultra-supercritical thermal power unit in the United States. The current researches on this alloy are mostly focused on steam oxidation, weldability and fatigue properties.

There are few reports on the effect of solution treatment process on alloy structure and properties. For this reason, the researchers studied the influence of the solution treatment process on its structure and hardness, and provided a test reference for the selection of the 700℃ ultra-supercritical steam turbine rotor in my country, and also provided a basis for the localization and practical application of the alloy.

The main chemical composition of Haynes alloy used in the test (mass fraction, %): C0.06, Cr19.64, Co10.04, Mo8.18, Al1.48, Ti2.15, Si≤0.1, Mn≤0.1, Fe≤0.1 , Ni margin. The test alloy was smelted in a 25kg vacuum induction furnace, and after homogenization, forged into a Φ16mm round rod. The original forged structure of the test alloy is fine and uniform, and there are more undissolved carbides in the grains and grain boundaries, and the carbides are continuously distributed in the grain boundaries.

The test alloys were subjected to solution treatment at 1060, 1090, 1120, 1150, and 1180°C for 2 hours to observe the structure and hardness of the alloy at different solution temperatures. Another group of samples were solution treated at 1120°C for 30, 60, 90, and 120 minutes respectively to observe the effect of solution time on the structure and hardness of the alloy.

A metallographic sample is taken from the alloy after solution treatment, and the microstructure observation and analysis and hardness test are carried out after grinding, polishing, and corrosion. The test results show:

(1) The grain size of Haynes282 heat-resistant alloy gradually increases with the increase of the solution temperature and the extension of the holding time. The calculation results show that the grain growth activation energy of the test alloy is about 382kJ/mol.
(2) When the solution is held at 1060～1150℃ for 2h, the undissolved MC and M23C6 carbides in the test alloy gradually re-dissolve with the increase of the solution temperature. After the solution temperature exceeds 1150℃, the carbides in the alloy are basically Dissolve. During the solution treatment at 1120℃, the carbides in the alloy dissolve quickly with the extension of the holding time.
(3) When the solid solution temperature range of 1060～1150℃ is maintained for 2h and 1120℃ is maintained for 30～120min, the hardness of the test alloy gradually decreases with the increase of the solution temperature and the extension of the holding time, while the grains grow and not The dissolution of dissolved carbides is the main reason that causes the hardness of the alloy to decrease.

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