Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Use GIVING24 at checkout to save 20% on eCourses and books (some exclusions apply)!

Investigations on the Microstructural Stability after Long-term High-temperature Exposure of Alloy 699 XA

Picture for Investigations on the Microstructural Stability after Long-term High-temperature Exposure of Alloy 699 XA
Available for download

VDM Alloy 699 XA (UNS N06699, EN Alloy number 2.4842) is a new alloy, which was developed for applications in the petrochemical industry under metal dusting conditions between 400°C and 800°C. Important properties of a new material are corrosion resistance, such as to metal dusting, oxidation resistance, and workability versus high temperature strength, which are essential for industrial applications. Currently, there are material solutions which demonstrate good metal dusting resistance, but may have issues with workability. In addition, there are also minimum requirements concerning creep resistance. It is therefore of fundamental interest, in the context of alloy design, to develop materials that has these important properties and satisfies the needs of industrial users.

Product Number: 51323-18845-SG
Author: Tatiana Hentrich, Heike Hattendorf, Sabine Bellmann, Benedikt Nowak
Publication Date: 2023
$0.00
$20.00
$20.00

Knowledge of the long-term microstructural stability of a new material is a fundamental requirement for industrial applications operating at temperatures > 500°C. For this reason, microstructural investigations on samples of the newly developed Alloy 699 XA after long-term exposure at temperatures between 500 and 900°C have been performed by scanning electron microscope (SEM). One key application of the new alloy is in the petrochemical industry under metal dusting conditions at high temperatures, underlining the importance of material characterizations presented in this study.
In addition to experimental investigations, thermodynamic calculations have been performed to get an overview of the relevant phases. One focus of the study was on the γ'-precipitation behavior of Alloy 699 XA over durations up to 5000 h. The SEM results showed that the solvus temperature for the γ’-phase is slightly above 800°C, which is in good agreement with the results of mechanical tests on the samples after aging. However, this solvus temperature is higher than the value from thermodynamic calculations (770°C), highlighting the importance of long-term exposure experiments.
Another essential result was that no detrimental, incoherent phases have been found even after 5000 h of exposure at higher temperatures and no continuous occupancy of one of the phases on the grain boundaries, which could have a negative impact on the creep strength of the material.

Knowledge of the long-term microstructural stability of a new material is a fundamental requirement for industrial applications operating at temperatures > 500°C. For this reason, microstructural investigations on samples of the newly developed Alloy 699 XA after long-term exposure at temperatures between 500 and 900°C have been performed by scanning electron microscope (SEM). One key application of the new alloy is in the petrochemical industry under metal dusting conditions at high temperatures, underlining the importance of material characterizations presented in this study.
In addition to experimental investigations, thermodynamic calculations have been performed to get an overview of the relevant phases. One focus of the study was on the γ'-precipitation behavior of Alloy 699 XA over durations up to 5000 h. The SEM results showed that the solvus temperature for the γ’-phase is slightly above 800°C, which is in good agreement with the results of mechanical tests on the samples after aging. However, this solvus temperature is higher than the value from thermodynamic calculations (770°C), highlighting the importance of long-term exposure experiments.
Another essential result was that no detrimental, incoherent phases have been found even after 5000 h of exposure at higher temperatures and no continuous occupancy of one of the phases on the grain boundaries, which could have a negative impact on the creep strength of the material.

Product tags
Also Purchased
Picture for The Influence of Electrochemical Potential and Stress-Level on Trench Nucleation on Ni-Bearing Low Alloy Steels in Sour Environments
Available for download

The Influence of Electrochemical Potential and Stress-Level on Trench Nucleation on Ni-Bearing Low Alloy Steels in Sour Environments

Product Number: 51323-19030-SG
Author: Dannisa R. Chalfoun, Mariano A. Kappes, Teresa E. Perez, Mariano Iannuzzi, José Luis Otegui, Ricardo M. Carranza
Publication Date: 2023
$20.00

The presence of trenches on low alloy steels (LAS) in sour environments at the open circuit potential (OCP) has been reported since 1977. Originally, they were classified as deep and elongated localized corrosion pits. Recently, many authors have referred to them as “stress-induced grooves.
Picture for 05050 Cathodic Protection of Piping Network in
Available for download

05050 Cathodic Protection of Piping Network in Congested Areas of a Petrochemical Plant

Product Number: 51300-05050-SG
ISBN: 05050 2005 CP
Author: Abdul Hameed Mohammad and Zia Chaudhary, Saudi Basic Industrial Corp.; Saleh A. Al-Harbi, Yanpet
$20.00
Picture for 04230 Investigation of Titanium Pipe Rupture in a
Available for download

04230 Investigation of Titanium Pipe Rupture in a Chemical Production Reactor

Product Number: 51300-04230-SG
ISBN: 04230 2004 CP
Author: Abdullah Al-Refaie and Oluwatoyin Ashiru, SABIC Technology Center
$20.00
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