ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Effects of solution treatment on the microstructure and mechanical properties in wroughtAlloy 718 were investigated. For the improvement of tensile and fatigue properties of wroughtAlloy 718, a modified solution heat treatment(MSHT), heating at 1000[removed info] for 3 minutes followed byfurnace cooling at the rate of 3[removed info]/minute and holding at 985[removed info] for 8 minutes, was proposed. Thistreatment was performed repeatedly 3 times and the samples were subject to the standard agingtreatment. For the purpose of comparison, a standard heat treatment(SHT) was also performed. Themicrostructures of modified solution heat treated specimens showed that small spherical shaped δ-phases were precipitated without grain growth, and the amount of δ-phases was smaller than that ofstandard heat treated specimens. However, the δ-phases of the standard heat-treated specimenshowed needle-like morphologies. Tensile and low cycle fatigue tests were performed on bothmodified heat-treated and standard heat-treated specimens at room temperature, 350[removed info] and 650[removed info].Low cycle fatigue tests on the modified heat treated specimens showed promising results withoutreduction of strength. However, the tensile properties of modified solution treated specimens wasalmost the same as those of standard heat treated materials both at room temperature and 650[removed info]
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.71.pdf
