Nov 25 2012
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Forming
Welding
Applications
Introduction
Super alloys or high performance alloys have an ability to function at temperatures above 540ºC(1000ºF) with deformation resistance and high surface stability. As they have good oxidation and creep resistance, super alloys can be commonly forged, rolled to sheet or produced in various shapes. Iron-base, nickel-base and cobalt-base alloys are the major types of super alloys. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. The iron-base super alloys are generally wrought alloys with stainless steel technology. These alloys can be strengthened by precipitation hardening, work hardening and solid-solution hardening.
HAVAR is a heat-treatable cobalt-base alloy, which has excellent corrosion resistance and high strength at elevated temperatures.
The following datasheet provides a detailed description of super alloy HAVAR.
Chemical Composition
The following table shows the chemical composition of super alloy HAVAR.
|
Element |
Content (%) |
|
Cobalt, Co |
41-44 |
|
Chromium, Cr |
19-21 |
|
Nickel, Ni |
12-14 |
|
Tungsten, W |
2.3-3.3 |
|
Molybdenum, Mo |
2-2.8 |
|
Manganese, Mn |
1.35-1.8 |
|
Carbon, C |
0.17-0.23 |
|
Beryllium, Be |
0.02-0.06 |
|
Iron, Fe |
Balance |
Physical Properties
The physical properties of super alloy HAVAR are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
7.7-8.03 g/cm³ |
0.278-0.290 lb/in³ |
|
Melting point |
1480ºC |
2696ºF |
Mechanical Properties
The mechanical properties of super alloy HAVAR are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1158 MPa |
16795 psi |
|
Yield strength |
1034 MPa |
14996 psi |
|
Modulus of elasticity |
190-210 GPa |
27557-30457 ksi |
|
Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
|
Elongation |
15% |
15% |
|
Reduction in area |
53% |
53% |
|
Hardness |
335 |
335 |
Thermal Properties
The thermal properties of super alloy HAVAR are displayed in the following table.
|
Properties |
Conditions |
|
T (ºC) |
Treatment |
|
Thermal conductivity |
42.7 W/mK |
100 |
- |
Fabrication and Heat Treatment
Forming
Tools with large radii are required for forming HAVAR.
Welding
Welding of HAVAR can be performed using common soldering and welding techniques.
Applications
The following are the major applications of super alloy HAVAR:
-
Springs
-
Diaphragms
-
Target foils for nuclear physics.