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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
W. El-Ghazaly1, A. Y. Shash2 and S. El-Ghazaly3*
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DOI:10.17265/2161-6221/2016.9-10.005
Affiliation(s)
1. Researcher at Central Metallurgical Research and Development Institute, P. O. Box 87, Helwan 11421, Egypt
2. University Teacher Faculty of Engineering Cairo University, Giza 12316, Egypt
3. Emeritus Professor at Central Metallurgical Research and Development Institute, P. O. Box 87, Helwan 11421, Egypt
ABSTRACT
Heat resistant stainless steel castings are widely used in several industrial sectors working at high temperatures like cement, chemical, heat treatment, metal enameling and other several industries. The purpose of this investigation is to examine the influence of changing microstructures and intermetallic precipitates (Ni3Al, Ni3Ti) by heat treatment on the mechanical properties of heat resistant steel castings of type 11Ni-23Cr-0.35C used at temperatures more than 950 ºC. Aluminum and Titanium were added to the steel melt before tapping the heat into the casting moulds. The change in microstructures after aging heat treatment (850-900 ºC, 85 to 200 h) was detected using scanning as well as optical microscopy. The mechanical properties (high temperature tensile and hardness and creep tests) were measured for all the microstructures obtained in as cast, solution treated and aged conditions. The results showed improved mechanical properties as compared to that for plain heat resistant steel castings, assuring enhancement of life time of treated and aged parts.
KEYWORDS
Heat resistant steel castings, solution treatment, gamma prime, chromium carbides, sigma phase, aging, change in microstructure, hot tensile strength, creep strength.
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