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51315-5754-Carburization Resistance of High-Temperature Ni- and Fe-Based Alloys

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Product Number: 51315-5754-SG
ISBN: 5754 2015 CP
Author: Joseph Meyer
Publication Date: 2015
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The carburization resistance of several wrought commercial Ni- and Fe-based alloys were tested at 982oC in Ar-5%H2-2%C3H8 for 215 hours. To avoid variability in test results often found when using CH4 as the carburizing gas this study used C3H8 to simulate the carburizing atmosphere. The analysis focused on metal recession measurements and characterization of the external and internal corrosion products using SEM/EDS. Included in the test matrix were HAYNES® HR-224® and HR-235™ two recently-developed Ni-based alloys. HR-224 alloy is an Al2O3-scale forming alloy that was developed for high-temperature oxidation resistance; while HR-235 was developed for metal dusting resistance. It was found that Al2O3-scale forming N07214 and HR-224 alloys and the Si-containing Cr2O3-scale forming N12160 outperformed the rest of the alloys tested. The Cr2O3-scale forming HR-235 also showed a relatively low amount of internal carburization.

The carburization resistance of several wrought commercial Ni- and Fe-based alloys were tested at 982oC in Ar-5%H2-2%C3H8 for 215 hours. To avoid variability in test results often found when using CH4 as the carburizing gas this study used C3H8 to simulate the carburizing atmosphere. The analysis focused on metal recession measurements and characterization of the external and internal corrosion products using SEM/EDS. Included in the test matrix were HAYNES® HR-224® and HR-235™ two recently-developed Ni-based alloys. HR-224 alloy is an Al2O3-scale forming alloy that was developed for high-temperature oxidation resistance; while HR-235 was developed for metal dusting resistance. It was found that Al2O3-scale forming N07214 and HR-224 alloys and the Si-containing Cr2O3-scale forming N12160 outperformed the rest of the alloys tested. The Cr2O3-scale forming HR-235 also showed a relatively low amount of internal carburization.

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