Nov 21 2012
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.