Incoloy 907 Introduction

Precipitation
Strengthened Alloy

Nickel

Iron

Cobalt

Corrosion
Resistance

63

Mechanical
Behavior

89

Purity

98

Overview

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INCOLOY® alloy 907 (UNS N19907) is a nickel-iron-cobalt alloy having high strength along with a low coefficient of thermal expansion. The alloy is strengthened by age-hardening heat treatments.

The combination of low expansion and high strength makes INCOLOY alloy 907 useful for gasturbine components. The low expansion enables closer control of clearances and tolerances for greater fuel efficiency. The high strength makes possible higher strength-to-density ratios for lower weight in aircraft engines. For those reasons, INCOLOY alloy 907 is used for gas-turbine seals, shafts, casings, and other structural parts.

The properties of INCOLOY alloy 907 are attractive for other applications including instrumentation, glass-to-metal sealing, ceramicmolding dies, and electricity generation.

Mechanical Properties

In the age-hardened condition, INCOLOY® alloy 907 has high mechanical properties. For example, when heat treated for optimum tensile properties, INCOLOY alloy 907 has yield and tensile strengths similar to those of INCONEL® alloy 718.

INCOLOY alloy 907 normally receives one of two heat treatments, depending on whether the strength requirements of the application are tensile limited or rupture limited. For tensile-limited applications, the age-hardening treatment is: 1325°F (720°C)/8 h, furnace cool at 100°F (55°C)/h to 1150°F (620°C)/8 h, air cool.

For rupture-limited applications, the treatment is: 1425°F (775°C)/12 h, furnace cool at 100°F (55°C)/h to 1150°F (620°C)/8 h, air cool.

Before either age-hardening treatment, the alloy is given a solution anneal of 1800°F (980°C)/1 h, air cool. Heat treatment of INCOLOY alloy 907 is covered by a U.S. patent.

Corrosion Resistance

INCOLOY alloy 907 contains no chromium because the presence of that element would increase thermal expansion. The absence of chromium, however, makes the alloy more susceptible to oxidation in high-temperature atmospheres. In some applications, INCOLOY alloy 907 may require a protective coating to prevent excessive oxidation. Figure 3 compares INCOLOY alloy 907 with INCONEL® alloy 718 (19% chromium) in a cyclic oxidation test at 1200°F (650°C).

A characteristic of INCOLOY alloy 907 is that unlike other alloys of comparable strength, it has good resistance to embrittlement in high-pressure hydrogen.

Physical Properties

Mechanical Properties