Effect of Alloying Modification in Arc Melted Hastelloy X on Microstructures and Oxidation Resistance at Elevated Temperatures

Pajaree Srigiofun; Panyawat Wangyao; Tanaporn Rojhirunsakool

doi:10.4028/www.scientific.net/KEM.658.8

Paper Titles

Preface, Scientific Committee, Organizers and Sponsors

Development of Forming Processes for MoNiCr Alloy
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Effect of Alloying Modification in Arc Melted Hastelloy X on Microstructures and Oxidation Resistance at Elevated Temperatures
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Effect of Pre-Weld Heat Treatment Temperatures on TIG Welded Microstructures on Nickel Base Superalloy, GTD-111
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Effect of Thermal Exposure on Long-Term Heated Microstructures at 900°C of Nickel Base Superalloy Turbine Blade, Grade Inconel 738
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Effect of Thermal Exposure on Long-Term Heated Microstructures at 900°C of Nickel Base Superalloy Turbine Blades, Grade Udimet 500
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Effects of Isothermal Aging on Microstructure Evolution of Biomedical Co-Cr-Mo Alloy
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Direct Observation of Liquation in Ni-Base Superalloy by Using Confocal Laser Scanning Microscopy
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Atmospheric Corrosion Behavior Assessment of Carbon Steel Pipes Using Cyclic Salt Spray Test
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 658Effect of Alloying Modification in Arc Melted...

Effect of Alloying Modification in Arc Melted Hastelloy X on Microstructures and Oxidation Resistance at Elevated Temperatures

Abstract:

The present research work has an aim to modify microstructure and oxidation behavior of Hastelloy X, a solid solution nickel base alloy, by both aluminium and titanium additions by mean of arc melting process. The Hastelloy X was added both Al and Ti (50:50) for 2% 4% and 6% by weight and casted by vacuum arc melting furnace. Then all received specimens were performed heat treatment, which consist of solutioning treatment at 1175°C for 4 hours and aging temperatures for 760°C, 800°C and 845°C for 24 hours. From the obtained results, it was found that the amount of both Al and Ti additions as well as precipitation aging temperature provided significant effect on both final microstructure and oxidation behaviors at 900°C and 1000°C. Widmanstatten type of microstructure was found in many case. Intermetallic phase formation of molybdenum and chromium was also found in all cases by element mapping. This phase should be γ’-phase. Both aluminium and titanium additions could not provide beneficial effect on oxidation resistance tests at temperature of 900°C and 1000°C. However, with 4%wt. of both aluminium and titanium addition, it resulted in slightly increasing of oxidation resistance at temperature of 1000°C

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Periodical:

Key Engineering Materials (Volume 658)

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8-13

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https://doi.org/10.4028/www.scientific.net/KEM.658.8

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Online since:

July 2015

Authors:

Pajaree Srigiofun, Panyawat Wangyao*, Tanaporn Rojhirunsakool

Keywords:

Hastelloy X, Microstructure, Nickel Base Alloy, Oxidation Resistance

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