Influence of homogenisation treatments on the hot ductility of cast ATI® 718Plus®: Effect of niobium and minor elements on liquation characteristics

The Effects of Chemistry Variations on Hot Cracking Susceptibility of Haynes® 282® for Aerospace Applications

“…The segregation of B along the grain boundaries lowered the incipient melting temperature therefore leading to increase of cracking. The increase of cracking after high temperature homogenization is in agreement with previously reported research on liquation cracking of standard cast Haynes 282 and other Ni-based superalloys [4,5,8,[42][43][44][45][46].…”

“…The cracking susceptibility of pre-weld homogenization heat treat at 1190 °C/4h was found to be higher than that of 1120 °C/4h heat treatment to grain boundary segregation of B, which suppresses the incipient melting temperature. Other than B, the segregation of P, S and Si are also known to promote the liquation cracking susceptibility of Ni and Ni-Fe based superalloys [7,8].…”

Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys

“…At the eutectic temperature, the Nb‐rich liquid phase transforms into (Laves + γ) eutectic phase by eutectic reaction. [ 5 ] The concentrations of Nb in γ phase, eutectic phase, and Laves phase are 5.36, 23.75, and 27.41 wt% in Pt‐free alloy, respectively. However, the concentrations of Nb in γ phase, eutectic phase, and Laves phase in Pt‐containing alloy is 10.12, 25.00, and 28.61 wt.%, respectively.…”

“…ATI 718Plus (hereafter referred to as 718Plus) is a newly developed polycrystalline nickel-based superalloy that is designed for use in modern aeroengine compressor discs as a replacement for Inconel 718. [1][2][3][4][5][6][7] ATI 718Plus has improved high temperature performance compared with the Inconel 718, giving it a 54 C higher operating temperature. [1,[8][9][10] The processing of alloy 718Plus, especially solidification, hot working and heat treatment practices, has to be carefully controlled to generate a desirable microstructure and therefore the required mechanical properties.…”