Super Alloy Haynes(r) R-41 (UNS N07041)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Cold Working
     Annealing
     Aging
     Hardening
Applications


Introduction

Super alloys or high performance alloys have good creep and oxidation resistance, and are formed in different shapes. They are classified into three types such as cobalt-based, nickel-based, and iron-based super alloys. They have the ability to function at very high temperatures and under mechanical stress. They can be strengthened by performing solid-solution hardening, work hardening, and precipitation hardening. The cobalt-based and nickel-based super alloys can be in the form of wrought or cast based on their application or composition.

Haynes(r) R-41 is a wrought nickel base high temperature and strength alloy. Double aging and solution heat treating are performed at low temperatures in order to increase its strength.

Chemical Composition

The following table shows the chemical composition of Haynes(r) R-41.

Element Content (%)
Chromium, Cr 17.5-20
Cobalt, Co 10-12
Molybdenum, Mo 9-10.5
Iron, Fe 5 max
Titanium, Ti 3-3.3
Aluminum, Al 1.4-1.8
Silicon, Si 0.5 max
Manganese, Mn 0.1 max
Carbon, C 0.04-0.12
Boron, B 0.003-0.01
Sulfur, S 0.015 max
Nickel, Ni Remainder

Physical Properties

The physical properties of Haynes(r) R-41 are given in the following table.

Properties Metric Imperial
Density 8.25 g/cm3 0.298 lb./in3
Melting point 1333°C 2430°F

Thermal Properties

The thermal properties of Haynes(r) R-41 are outlined in the following table.

Properties Metric Imperial
Thermal conductivity (@149°C/300°F) 11.5 W/mK 80 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to Haynes(r) R-41 are included in the following table.

       
AISI 683 AMS 5800 GE B50T94 GE B50TF210
AMS 5545 DIN 2.4973 GE B50TF109 GE B50TF59
AMS 5712 GE B50T44 GE B50TF11 GE B50TF75
AMS 5713 GE B50T59 GE B50TF110 GE B50TF76

Fabrication and Heat Treatment

Machinability

Haynes(r) R-41 can be machined using conventional methods which are used for iron-based alloys. Commercial coolants are used for performing machining operations. Water-based coolants are used for performing high-speed operations such as milling, grinding or turning. Heavy lubricants are preferred for tapping, drilling, boring or broaching.

Forming

Haynes(r) R-41 can be formed using all conventional techniques.

Welding

Haynes(r) R-41 is welded using gas-tungsten arc welding, gas metal-arc welding, shielded metal-arc welding and submerged-arc welding methods.

Heat Treatment

Haynes(r) R-41 is heat treated by annealing at 1080°C (1975°F) for 4 h followed by cooling. After this process, aging heat treatment is done at 760°C (1400°F) for 16 h followed by cooling.

Forging

Haynes(r) R-41 can be forged in the solution annealed condition.

Cold Working

Haynes(r) R-41 is cold worked using standard tooling.

Annealing

Haynes(r) R-41 is annealed at 1066 to 1080°C (1950 to 1975°F) for 4 h followed by cooling.

Aging

Haynes(r) R-41 is aged at 760°C (1400°F) for 16 h followed by cooling.

Hardening

Haynes(r) R-41 can be hardened only by cold working.

Applications

Haynes(r) R-41 is used in high temperature and strength environments which require high oxidation resistance. It is also used in aircraft, gas turbine and land/marine, applications.

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