delta phase microstructural parameters such as delta content, and useful parameters for the forger as far as sensitive enough delta phase evaluation methodology can be used. Two approaches have been successively carried out to determine the individual geometry of delta particles and the delta content.
Though Alloy 718 is strengthened by γ′′ precipitation, the nucleation of δ phase is used to stabilize grain size and also to improve its high temperature stress rupture properties. Large body of work has been reported in the literature on the precipitation of the γ′′ phase.
Influence of the Delta Phase in the Microstructure of the Inconel …
2015年1月1日 · Stable δ phase with acicular morphology weakens the IN718, however, it has been found that a spherical morphology distributed in the grain boundaries acts as an anchor preventing grain growth during hot deformation.
δ Phase precipitation in Inconel 718 and associated mechanical ...
2017年1月2日 · Microstructures generated by δ phase precipitation in Inconel 718 (IN718) and related mechanical properties were investigated in this paper. Several heat treatments enabling the precipitation of the δ phase in various proportions and morphologies were conducted.
Acicular Delta Phase in Inconel Alloys: Formation ... - LinkedIn
2024年3月14日 · Inconel 718 fortified with Delta Phase exhibits improved strength, creep resistance, and fatigue performance, making it indispensable in high-temperature and high-stress environments. This...
Delta phase precipitation in Inconel 718 - ScienceDirect
2004年9月1日 · For ageing times of less than 100 h, the δ-phase precipitates between about 700 °C and its solvus temperature (≈1000 °C). The rate of its precipitation is highest at around 900 °C. It normally precipitates by nucleation at grain boundaries followed by the growth of thin plates extending into the grains.
Precipitate and dislocation-density interactions affecting strength …
2023年8月16日 · While the role of the acicular δ phase in EAC of PH nickel alloys is documented, the role of discrete δ phase presence on the grain boundary is not fully understood. Acicular δ was shown to be detrimental to EAC for 718 leading to a significantly lower ratio of strain to failure compared to a microstructure that did not show any acicular δ ...
acicular delta phase (G). Recrystalization during subsequent thermomechanical working below the G solvus promotes a uniform fine grain structure and the acicular G morphology
Hot Forging of IN718 with Solution-Treated and Delta ... - Springer
2016年7月29日 · Significant research has been directed toward characterizing the precipitation and dissolution kinetics of the δ phase in IN718 during heat treatment and aging, e.g., [1 – 5], and several experimental investigations have explored recrystallization associated with high-temperature compressive flow in solution-treated material, e.g., [6 – 10], but...
Effect of process parameters and heat treatments on delta-phase ...
2022年1月24日 · Based on the location of precipitation, δ-phase can be distinguished as intergranular- or intragranular-δ. Morphologically, intergranular-δ appears as discrete globular or blocky particles, whereas the intragranular-δ appears as acicular precipitates [4].