Nov 16 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Introduction
Super alloys are also known as high performance alloys. They have the capacity to function under very high temperatures and severe mechanical stress, and also where high surface stability is required. They have good creep and oxidation resistance.
Strengthening of super alloys is performed by solid-solution hardening, work hardening, and precipitation hardening methods. Super alloys contain many elements in a variety of combinations so as to achieve desired results. There are three groups of alloys, namely cobalt-base, nickel-base, and iron-base. All of these can be used at temperatures above 540°C (1000°F).
Inconel 625LCF™ is specifically designed with low cycle fatigue resistance at temperatures up to 649°C (1200°F).
The following datasheet will provide more details about Inconel 625LCF™.
Chemical Composition
The following table shows the chemical composition of Inconel 625LCF™.
|
Element |
Content (%) |
|
Nickel, Ni |
≥ 58 |
|
Chromium, Cr |
20-23 |
|
Molybdenum, Mo |
8-10 |
|
Iron, Fe |
≤ 5 |
|
Niobium, Nb |
3.15 - 4.15 |
|
Cobalt, Co |
≤ 1 |
|
Manganese, Mn |
≤ 0.50 |
|
Titanium, Ti |
≤ 0.40 |
|
Aluminum, Al |
≤ 0.40 |
|
Carbon, C |
≤ 0.030 |
|
Nitrogen, N |
≤ 0.020 |
|
Silicon, Si |
≤ 0.020 |
|
Phosphorous, P |
≤ 0.015 |
|
Sulfur, S |
≤ 0.015 |
Physical Properties
The physical properties of Inconel 625LCF™ are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.44 g/cm³ |
0.305 lb/in³ |
|
Melting point |
1290-1350°C |
2350-2460°F |
Mechanical Properties
The mechanical properties of annealed Inconel 625LCF™ are provided below.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
769.5 MPa |
111600 psi |
|
Yield strength (at strain 0.200%) |
319 MPa |
46300 psi |
|
Elastic modulus |
208 GPa |
30200 ksi |
|
Shear modulus |
81.4 GPa |
11800 ksi |
|
Poisson’s ratio |
0.28 |
0.28 |
|
Elongation at break |
63% |
63% |
|
Hardness, Rockwell B |
84 |
84 |
Thermal Properties
The thermal properties of Inconel 625LCF™ are given below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (at 21-100°C/69.8-212°F) |
12.8 µm/m°C |
7.11 µin/in°F |
|
Thermal conductivity |
9.70W/mK |
67.3 BTU in/hr.ft².°F |