"Creep-rupture Performance of a Recrystallizing Solution Treatment for " by David Newell, Anthony N. Palazotto et al. 10.2514/6.2020-1123">
 

Creep-rupture Performance of a Recrystallizing Solution Treatment for Inconel 718 Fabricated by Laser Powder-bed Fusion

Document Type

Conference Proceeding

Publication Date

1-6-2020

Abstract

Inconel 718 (IN718) is an excellent candidate for laser powder-bed fusion (LPBF) fabrication. However, the LPBF process results in anisotropic mechanical properties in the as-built IN718. Existing heat treatments for wrought IN718 do not modify the grain structure to mitigate this directional dependence. Increasing the time and temperature of the solution treatment generated sufficient recrystallization to provide an isotropic microstructure. Tensile creep-rupture tests were performed on LPBF IN718 specimens fabricated in 1) vertical and 2) horizontal orientations. These specimens were treated with either the 1) conventional or 2) recrystallizing solution treatment. The conventional solution treatment (CST) resulted in excellent rupture life in both orientations and exceeded the wrought standard by over 100%. The recrystallizing solution treatment (RST) produced an increased anisotropy in rupture life, contrary to the isotropic tensile properties exhibited by the same treatment. The horizontal specimens with the RST displayed a small increase over the CST specimens, but the vertical RST specimens suffered a loss of 47.5% of rupture life.

Comments

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Co-author David Newell was an AFIT PhD candidate at the time of this conference. (AFIT-ENY-DS-20-M-274, March 2020)

Source Publication

AIAA Scitech 2020 Forum

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