ADI (Austempered Ductile Iron)
Structure
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The Austenitic Matrix of Acicular Ferrite known as Ausferrite which makes up the microstructure of ADI.
Properties
Austempered Ductile Iron [ADI] provides a range of high strength irons with higher ductility and toughness. Through the work hardening characteristics of the matrix these irons have an exceptional blend of wear properties and toughness. These irons have the advantage that the base iron is readily machinable before heat treatment allowing hard wearing close tolerance and mating parts to be produced.
- Tensile
- Twice the tensile strength of Ductile Iron.
- Work Hardens.
- Wear
- Wear resistance superior to Steel at any hardness level.
- Ideal for high abrasion applications.
- Weight
- 10% lighter than Steel.
- Cost
- Energy savings over Steel.
- Easier to machine than Steel reduced macining allowances.
- Near net shaped castings means even less machining.
Applications & Examples
The properties of ADI coupled with the cost and flexibility benefits of ductile iron castings means the potential for ADI applications is vast.
Agriculture - excelent resistance to soil wear.
Digger/Grab Teeth - high strength and wear resistance.
Industrial - wear components, pumps, etc.
Gears - for wear resistance and better vibration damping than Steel.
Construction - crushing, grading and wear components etc.
Food & Feed milling - grinding, mixing, pelletising etc.
| Mechanical Properties measured on test pieces from separately cast samples. | ||||
|---|---|---|---|---|
| Material Symbol | Number | Tensile Strength N/mm2 (min) | 0.2% Proof Stress N/mm2 (min) | Elongation % (min) |
| Refer to relevant Standard for full details | ||||
| EN-GJS-800-8 | EN-JS1100 | 800 | 500 | 8 |
| EN-GJS-1000-5 | EN-JS1110 | 1000 | 700 | 5 |
| EN-GJS-1200-2 | EN-JS1120 | 1200 | 850 | 2 |
| EN-GJS-1400-1 | EN-JS1130 | 1400 | 1100 | 1 |
| Grade | Tensile Strength (min) | Yeild Strength (min) | Elongation % | Impact Energy * | Typical Hardness BHN |
|||
|---|---|---|---|---|---|---|---|---|
| Ksi | Nmm2 | Ksi | Nmm2 | Ft-lbs | Joules | |||
| * Un-notched charpy bars tested @ 22'C (+/-4'C) Refer to relevant Standard for full details |
||||||||
| 1 | 125 | 850 | 80 | 550 | 10 | 75 | 100 | 269-321 |
| 2 | 150 | 1050 | 100 | 700 | 7 | 60 | 80 | 302-363 |
| 3 | 175 | 1200 | 125 | 850 | 4 | 45 | 60 | 341-444 |
| 4 | 200 | 1400 | 155 | 1100 | 1 | 25 | 35 | 388-477 |
| 5 | 230 | 1600 | 185 | 1300 | - | - | - | 444-555 |