Microstructural Characterization of Custom Age 625 Plus Alloy

Abstract

Metallographic procedures and microstructural characterization results for Carpenter's Custom Age 625 PLUS@ alloy, an age-hardenable, highly corrosion resistant Ni-base alloy, are presented. Characterization was performed by light and electron microscopy techniques as a function of solution annealing and aging temperatures and times. The extremely high corrosion resistance of the alloy makes good etch delineation difficult to obtain. Gamma double prime is the main strengthening phase and it is liner in size than in alloy 718. Dark field TEM imaging is required to observe and identify gamma double prime. Observation of coarse gamma double prime is possible with a field emission scanning electron microscope.

A metallurgical and thermal analysis of Inconel 625 electron-beam welded joints

“…Niobium carbides and Leave's precipitates are also found in the PM as shown in Fig. 6 [30,33]. No other type of precipitate has been found in the parent material.…”

“…The dark precipitate contains mostly Titanium and Niobium (Fig. 5c) and is therefore classified, according to literature [30], as MC (TiC) carbide. The smaller precipitates (Label 2) are distributed along the grain boundaries and have a fine globular aspect.…”

In Situ Alloying of a Modified Inconel 625 via Laser Powder Bed Fusion: Microstructure and Mechanical Properties

“…In particular, higher Ti content with respect to IN625 alloy leads to the activation of a more prominent formation of phases during aging treatments. These alloys are the perfect candidates for working in the oil and gas, marine, and chemical processing industries due to corrosive resistance similar to IN625 combined with superior tensile strengths [9,[24][25][26][27]. The quantity of added Ti content must be carefully controlled, considering that a high Ti concentration can reduce the weldability of the alloy, thus promoting crack formations [28].…”