Menu
Search
Filters
Close
Menu

51316-7331-Corrosion Resistance of Cast Nickel Base Superalloys in Environments Relevant to Gas-Turbines Operating on Sulfur Rich Fuels

Picture for Corrosion Resistance of Cast Nickel Base Superalloys in Environments Relevant to Gas-Turbines Operation
Available for download

 Oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases from high sulfur containing fuels. Experiments at 1050°C for up to 500 hours duration. The studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times.

Product Number: 51316-7331-SG
ISBN: 7331 2016 CP
Author: Dmitry Naumenko
Publication Date: 2016
Industry: Materials Selection and Design
$0.00
$20.00
$20.00

Future power generation requires gas turbines with high efficiency and fuel flexibility. The latter requirement implies that the turbine components will be exposed to more aggressive service environments. In the present work the oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases originating from high sulfur containing fuels.

The experiments were performed at 1050°C for various times up to 500 hours duration. For elucidating the mechanisms of corrosion attack, the studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times. In the investigated material, internal sulfidation was observed underneath the oxide scale, which led to non-protective, breakaway oxidation after extended exposure times. The corrosion resistance of the studied material in the presence of SO2 could not be explained in terms of the concentrations of the main oxide scale forming elements, Cr and Al. Apart from the latter elements, various strengthening alloying additions including Hf, C and B were found to have a profound effect on the extent of the corrosion attack. The latter element was found to be rapidly enriched in the oxide scale thereby promoting internal oxidation and sulfidation. 

Key words: downloadable, Ni-base superalloys, SO2-induced corrosion, Hf, C, B

 

Future power generation requires gas turbines with high efficiency and fuel flexibility. The latter requirement implies that the turbine components will be exposed to more aggressive service environments. In the present work the oxidation behavior of a commercial, cast Ni-base superalloy was studied in air-SO2 mixture, simulating combustion gases originating from high sulfur containing fuels.

The experiments were performed at 1050°C for various times up to 500 hours duration. For elucidating the mechanisms of corrosion attack, the studied alloy was characterized with a number of analytical methods including SEM / EDX and GDOES after different oxidation times. In the investigated material, internal sulfidation was observed underneath the oxide scale, which led to non-protective, breakaway oxidation after extended exposure times. The corrosion resistance of the studied material in the presence of SO2 could not be explained in terms of the concentrations of the main oxide scale forming elements, Cr and Al. Apart from the latter elements, various strengthening alloying additions including Hf, C and B were found to have a profound effect on the extent of the corrosion attack. The latter element was found to be rapidly enriched in the oxide scale thereby promoting internal oxidation and sulfidation. 

Key words: downloadable, Ni-base superalloys, SO2-induced corrosion, Hf, C, B

 

Product tags
Also Purchased
Picture for Comparing Environmental Resistance of UNS R55400 Tubulars to Other Oilfield Ttianium Alloys
Available for download

51316-7328-Comparing Environmental Resistance of UNS R55400 Tubulars to Other Oilfield Titanium Alloys

Product Number: 51316-7328-SG
ISBN: 7328 2016 CP
Author: Ronald Schutz
Publication Date: 2016
$20.00

This paper presents an expanded laboratory test database on critical corrosion modes for UNS R55400 pipe exposed to relevant oilfield production environments which include sour well fluid brines, a heavy chloride/bromide brine well completion fluid, injected methanol, organic acid- and HCl-based well acidizing solutions, and seawater.
Picture for Estimation of Critical Localized Corrosion Potentials of Duplex SS with Galvele's Model
Available for download

51316-7326-Estimation of Critical Localized Corrosion Potentials of Duplex SS with Galvele's Model

Product Number: 51316-7326-SG
ISBN: 7326 2016 CP
Author: Mariano Kappes
Publication Date: 2016
$20.00

Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated.
Picture for UNS N09955 Corrosion Cracking Resistance
Available for download

51316-7355-UNS N09955 Corrosion Cracking Resistance

Product Number: 51316-7355-SG
ISBN: 7355 2016 CP
Author: Carlo Malara
Publication Date: 2016
$20.00

The UNS N09955 is a precipitation hardened Ni-alloy which exhibits a good combination of mechanical strength, ductility, toughness and resistance to hydrogen embrittlement
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support