Introduction

Precipitation
Strengthened Alloy

Cobalt

Nickel

Iron

Corrosion
Resistance

65

Mechanical
Behavior

87

Purity

92

Overview

As a leading supplier & manufacturer in China, AEETHER supply cost-effective Inconel 783 Products.

The newest of the high-performance superalloys invented by Special Metals Corporation, INCONEL® alloy 783 (UNS R30783 / U.S. Patent 5,478,417), is an oxidation-resistant, low expansion, nickel-cobalt-iron alloy with aluminum, chromium, and niobium additions. The new alloy is of considerable interest to aircraft gas turbine engine designers and materials engineers for containment and clearance control components such as rings, casings, shrouds and seals for compressors, turbines and exhaust systems. The three-phase age hardenable alloy offers a range of improvements for these applications over alternative alloys in current use:

• A coefficient of thermal expansion approximately 20% lower than that of INCONEL alloy 718.
• Excellent resistance to oxidation, demonstrated in cyclic tests, at temperatures up to and beyond 1300°F (704°C).
• Resistance to SAGBO (stress accelerated grain boundary oxidation) comparable to that of INCONEL alloy 718, and significantly better than that of INCOLOY alloy 909.
• A density of 0.282 lb/in3 (7.81 g/cm3), 5% less than INCONEL alloy 718 or INCOLOY® alloy 909, contributing to an important potential improvement in strength-to-weight ratios.
• Manufacturing/processing characteristics comparable to those of INCONEL alloy 718, and less limiting than those of INCOLOY alloy 909.
• Special Metals’ INCONEL alloy 783 is available as forging billet (AMS 5940), rod and bar for machining, extruded section, and wire rod. Sheet product is currently under development.

Mechanical Properties

In the age-hardened condition, INCONEL alloy 783 has high mechanical properties at room temperature and retains much of its strength at temperatures to about 1300°F (704°C). All mechanical properties given here are for the standard heat treatment:
Solution anneal at 2050°F (1121°C)/1 hr, air cool, plus “beta age” at 1550°F (845°C)/4 hr, air cool to room temperature, plus age harden at 1325°F (718°C)/8 hr, furnace cool at 100°F (55°C)/ hr to 1150°F (621°C)/8 hr, and air cool.

Oxidation and Salt Spray Resistance

To achieve low CTE, alloys based on Ni-Fe-Co compositions require the chromium content be maintained at low levels. Added Cr lowers the Curie temperature and thereby increases thermal expansion rate over a wider temperature range. The necessary lack of Cr reduces resistance to both general oxidation and stress accelerated grain boundary oxygen enhanced cracking (SAGBO). Increased amounts of Al in alloys strengthened by γ´alone promotes SAGBO. Alloy 783 is the culmination in the development of an alloy system with very high aluminum content that, in addition to forming γ´, causes β aluminide phase precipitation in the austenitic matrix. It was discovered that this type of structure could be processed to resist both SAGBO and general oxidation, while providing low thermal expansion and useful mechanical properties up to 700°C.

Physical Properties

Mechanical Properties

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