UDIMET Alloy D-979 (UNS N09979)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Applications

Introduction

UDIMET alloys are a category of super alloys, whose base metal varies from iron, cobalt and nickel. High-performance alloys that are capable of functioning under elevated temperatures and high mechanical stress are called super alloys. The hardening techniques used on the alloys varies from one alloy to another, depending on the composition. Some of the UDIMET alloys available commercially are UDIMET alloy D979, 250, 720, D-979, L-605 and R41.

UDIMET alloy D-979 is a super alloy of iron-nickel. This alloy is capable of functioning even under temperatures of 649-760°C (1200-1400°F). The hardening of this alloy is done through complex precipitation of inter-metallic phases. Some of the characteristics of this alloy are corrosion resistance, stress rupture strength and very good tensile strength.

This datasheet will look into the chemical composition, properties and applications of UDIMET alloy D979.

Chemical Composition

The chemical composition of UDIMET alloy D979 is given in the following table.

Physical Properties

The following table discusses the physical properties of UDIMET alloy D979.

Mechanical Properties

The mechanical properties of UDIMET alloy D979 are tabulated below.

Other Designations

Some of the other designations that are used to denote UDIMET alloy D979 are as below:

• UNS N09979
• AMS 5746

Applications

The UDIMET alloy D979 is used in gas turbine disc applications.