Dec 17 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Super alloys are also known as high performance alloys. They contain a number of elements in different combinations to obtain the desired result. They have the capacity to function at very high temperatures and severe mechanical stress, and also where high surface stability is required. Solid-solution hardening, work hardening, and precipitation hardening are performed for strengthening the super alloys. There are three types of super alloys such as cobalt-based, nickel-based, and iron-based alloys. Cobalt-based super alloys have higher melting points than nickel-based or iron-based alloys.
Incoloy DS™ is a heat resistant iron-nickel-chromium alloy. The following datasheet gives more details about Incoloy DS™.
Chemical Composition
The following table shows the chemical composition of Incoloy DS™.
|
Elements |
Content (%) |
|
Iron, Fe |
40 |
|
Nickel, Ni |
34.5-41 |
|
Chromium, Cr |
17-19 |
|
Silicon, Si |
1.90-2.60 |
|
Manganese, Mn |
0.80-1.50 |
|
Copper, Cu |
0.50 |
|
Titanium, Ti |
0.20 |
|
Carbon, C |
0.10 |
|
Sulfur, S |
0.030 |
Physical Properties
The physical properties of Incoloy DS™ are highlighted in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
7.86 g/cm³ |
0.284 lb/in³ |
|
Melting point |
1372°C |
2500°F |
Mechanical Properties
The mechanical properties of Incoloy DS™ are given in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (solution annealed, value at room temperature) |
580 MPa |
84100 psi |
|
Yield strength (@ strain 0.200%, precipitation hardened, value at room temperature) |
215 MPa |
31200 psi |
|
Elongation at break (solution annealed) |
60% |
60% |
Thermal Properties
The thermal properties of Incoloy DS™ are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 20-100°C/68-212°F) |
15 µm/m°C |
8.33 µin/in°F |
|
Thermal conductivity |
12 W/mK |
83.3 BTU in/hr.ft².°F |
Other Designations
Other designation equivalent to Incoloy DS™ is DIN 1.4864.
Fabrication and Heat Treatment
Machinability
Incoloy DS™ can be machined using conventional machining methods which are usually used for iron-based alloys. Machining operations are performed using commercial coolants. High-speed operations such as grinding, milling or turning, are performed using water-base coolants.
Forming
Incoloy DS™ can be formed using all conventional techniques.
Welding
Incoloy DS™ is welded using gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding, and submerged-arc welding methods
Heat Treatment
Incoloy DS™ does not respond to heat treatment
Forging
Incoloy DS™ is forged at 1094°F (2000°F).
Hot Working
Incoloy DS™ is hot worked at 1038°C (1900°F).
Cold Working
Incoloy DS™ is cold worked using standard tooling.
Annealing
Incoloy DS™ is annealed at 1066°C (1950°F) followed by cooling.
Hardening
Incoloy DS™ can be hardened only by cold working.
Applications
Incoloy DS™ is mainly used in industrial heat-treating furnaces.