High temperature oxidation/sulfidation studies of γ/γ’ strengthened cobalt-based superalloys
High temperature oxidation/sulfidation studies of γ/γ’ strengthened cobalt-based superalloys
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The goal of this project is to determine the rate and mechanism of oxidation and sulfidation of γ/γ’ strengthened cobalt-based superalloys, a promising alloy for nuclear and turbine applications. Currently reported, W-added, Co-based superalloys are prone to high temperature oxidation issues. We are studying high temperature oxidation of W-free cobalt base superalloys. As a part of undergoing work, effect of different alloying addition on corrosion behaviour is also being studied. With the current state of art facilities, we are also studying the effect of different environment on oxidation behaviour of these alloys.
A view of the high temperature oxidation and sulfidation set up
In-situ and Ex-situ corrosion studies of nickel and cobalt based superalloys in molten salt environment
In-situ and Ex-situ corrosion studies of nickel and cobalt based superalloys in molten salt environment
Molten salt are the integral part of advanced concentrated solar power (CSP) plants, used as heat transfer fluid and thermal energy storage (TES) media. Molten salt systems based on chloride, fluoride or sulphate are quite corrosion above 400 C. Evaluating their rate and mechanism of corrosion on structural materials like steel and Ni-based superalloys need to be studied thoroughly to increase the life time of these plants. The goal of this project is to develop an in-situ high temperature electrochemical corrosion cell to perform molten salt corrosion testing. Parallel to that, we are also involved in studying long term isothermal corrosion of these salts on several high temperature materials.
Corrosion behaviour of structural materials under supercritical CO2 environment
Corrosion behaviour of structural materials under supercritical CO2 environment
The super critical CO2 Brayton cycle based power generation has the potential to replace the steam based nuclear and thermal power plants. Under similar conditions of pressure temperature CO2 gas is twice as dense as steam, resulting in a high power density. The new technology can enormously decrease the space requirement while increasing the efficiency of the power generation. But the interaction of structural materials at such high pressure and high temperature in CO2 environment has not been explored comprehensively. Pure, dry CO2 is almost inert at low temperatures < 500 oC. However, at high temperatures, > 600 oC steels and Ni based alloys have shown significant corrosion.
Our group is developing a high pressure high temperature loop to conduct corrosion in supercritical CO2 environment. The goal of this project is to determine the rates and mechanisms of corrosion of ferritic and austenitic steel with different processing history. Along with that commercial Ni based superalloys will also be studied.
Materials for advanced ultra-supercritical (AUSC) coal power plants.
Materials for advanced ultra-supercritical (AUSC) coal power plants.
Materials performance represents one of the major challenges in both during the performance and life cycle prediction of an advanced ultra-supercritical (AUSC) high temperature and high pressure power plant. Under severe condition of high pressure and high temperature corrosion become the major cause of material failure. We are developing facility for performing high- pressure and high-temperature supercritical steam corrosion studies.
The goal of this project is to evaluate a range of structural materials, and develop a data base of corrosion rate and their mechanism of failure/ protection in such severe conditions.
Group Members
Group Members
- Poorwa Gowre (PostDoc)
- Mahander Pratap Singh (PhD)
- Saurabh Mohan das (PhD)
- Pritha (PhD)
- Om Puri Gosain (PhD)
- Surya Teja (Project assistant)
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