Jul 24 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Cold Working
Annealing
Aging
Applications
Introduction
Super alloys are high performance alloys that can withstand extreme temperatures and are corrosion resistant. Super alloy Pyrotool W is a nickel-based high temperature, high strength alloy. It has been designed with hardness and strength at temperatures up to 816°C (1500°F). The following sections will discuss in detail about super alloy Pyrotool W.
Chemical Composition
The chemical composition of Pyrotool W is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
18 - 21 |
|
Cobalt, Co |
12.5 - 14 |
|
Molybdenum, Mo |
3.8 - 4.6 |
|
Titanium, Ti |
2.5 - 3.5 |
|
Iron, Fe |
2 max |
|
Aluminum, Al |
1.2 - 1.6 |
|
Manganese, Mn |
1 max |
|
Silicon, Si |
0.75 max |
|
Copper, Cu |
0.5 max |
|
Zirconium, Zr |
0.05 - 0.07 |
|
Sulfur |
0.03 max |
|
Phosphorus, P |
0.03 max |
|
Boron, B |
0.006 min |
|
Carbon, C |
0.006 min |
|
Nickel, Ni |
Remainder |
Physical Properties
The physical properties of Pyrotool W are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8 g/cm3 |
0.29 lb/in3 |
|
Melting point |
1357°C |
2475°F |
Other Designations
Equivalent materials to Pyrotool W are provided below.
|
AISI 685 |
AMS 5544 |
AMS 5586 |
AMS 5704 |
|
AMS 5706 |
AMS 5708 |
AMS 5709 |
AMS 5828 |
|
ASTM B637 |
DIN 2.4654 |
PWA 1005 |
PWA 1006 |
|
PWA 1007 |
PWA 1030 |
PWA 686 |
PWA 687 |
|
SPS M175 |
|
|
|
Fabrication and Heat Treatment
Machinability
Super alloy Pyrotool W can be machined using all the common processes. can be machined using the common processes applied to iron based alloys. This alloy does work-harden during machining and displays higher strength and "gumminess" unlike steels.
Forming
Super alloy Pyrotool W can be formed using any of the conventional methods. Powerful equipment is required to perform forming operations as this alloy is strong.
Welding
Welding processes of super alloy Pyrotool W can be performed using all the traditional welding methods as it is very ductile. Matching alloy filler metal should be used. In case that is not available, it is advised that the nearest alloy closest to the chemical composition be used.
Forging
Hot forging can be performed in the temperature range of 1037-1204°C (1900-2200°F) and then air cooled. Liquid cooling should be avoided. In case of very heavy sections, slow furnace cooling is recommended after hot working.
Cold Working
Pyrotool W can be cold formed using common tooling.
Annealing
Pyrotool W can be solution annealed at 1079°C (1975°F) for 4 h and then air cooled.
Aging
This super alloy can be aged at 718°C (1325°F) for 16 h and air cooled to gain high strength. Prior to aging the alloy should solution heat treated. The alloy is age hardenable after solution annealing at 1975F it is given a 24 hour time at 1550F followed by air cool then 16 hours at 1400F followed by air cool.
Applications
Super alloy Pyrotool W is used in the following application areas as listed belw:
-
Gas turbines for aircraft
-
Land/marine applications