The effect of heat treatment on the microstructure and mechanical properties of Ni-base superalloy Haynes 282 was investigated. Applying a standard two-step ageing (1010 °C/2 h +788 °C/8 h) to the as-received, mill annealed, material resulted in a the presence of discrete grain boundary carbides and finely dispersed intragranular γ′, with an average size of 43 nm. This condition showed excellent room temperature strength and ductility. The introduction of an additional solution treatment at 1120 °C resulted in grain growth, interconnected grain boundary carbides and coarse (100 nm) intragranular γ′. The coarser γ′ led to a significant reduction in the strength level, and the interconnected carbides resulted in quasi-brittle fracture with a 50% reduction in ductility. Reducing the temperature of the stabilization step to 996 °C during ageing of the mill annealed material produced a bi-modal γ′ distribution, and grain boundaries decorated by discrete carbides accompanied by γ′. This condition showed very similar strength and ductility levels as the standard ageing of mill-annealed material. This is promising since both grain boundary γ′ and a bi-modal intragranular γ′ distribution can be used to tailor the mechanical properties to suit specific applications. The yield strength of all three conditions could be accurately predicted by a unified precipitation strengthening model.

http://publications.lib.chalmers.se/records/fulltext/245117/local_245117.pdf

Influence of heat treatment on the microstructure and tensile properties of Ni-base superalloy Haynes 282

The aim of this work is to characterize the precipitation kinetics in Haynes® 282® superalloys using in-situ high-energy Small Angle X-ray Scattering (SAXS) together with Wide Angle X-ray Scatterin ...

/pdf/correlation-of-precipitate-evolution-with-vickers-hardness-2n4eqi4d3x.pdf

Correlation of precipitate evolution with Vickers hardness in Haynes® 282® superalloy : In-situ high-energy SAXS/WAXS investigation

Stress Relief Cracking Susceptibility in High Temperature Alloys

ICME framework to simulate microstructure evolution during laser powder bed fusion of Haynes 282 nickel-based superalloy

A study on laser weldability improvement of newly developed Haynes 282 superalloy

The effect of alloying elements on the mechanical properties and weldability of wrought gamma prime strengthened nickel based superalloys is well known. An understanding of the basic guidelines concerning alloying additions has led to the invention and development of HAYNES 282 alloy for applications in aircraft and land based gas turbines and other high performance high temperature environments. The alloy combines exceptional high temperature properties with good weldability and fabricability. At high temperatures (∼900°>C), the alloy is stronger in creep strength than Waspaloy alloy (UNS N07001) and it approaches the creep strength of R-41 alloy (UNS N07041). Because the alloy has better thermal stability, fabricability and weldability than Waspaloy and R-41 alloys, it is currently being considered as a candidate universal consumable for welding/repair welding of gamma prime strengthened nickel based superalloys and it is also being considered as a suitable replacement for applications where R-4...

Weldability of HAYNES 282 alloy for new fabrications and after service exposure

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Weldability of HAYNES 282 alloy for new fabrications and after service exposure