ADI; ASTM AM, ASTM (in-lb units) ASTM M (SI units) Austempered Ductile Iron (ADI) offers low cost, design flexibility. ASTM A is an alloyed nodular iron which is heat treated to achieve the desired properties. Austempered ductile iron (ADI) is a. This standard is issued under the fixed designation A/AM; the number 1 This specification is under the jurisdiction of ASTM Committee A04 on Iron.

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This makes the material stronger and tougher than heat treated ductile iron. Another benefit of designing with ADI is the improved abrasion resistance properties.

The heavier the effective section aastm and the more massive the casting, the slower will be the cooling or quenching rate in the austempering cycle. The standard specimens for tension and Charpy impact tests are illustrated.

The impact test specimens must be? The values stated in each system are not exact equivalents; therefore, each atm shall be used independently of the other.

ASTM A897-A897M-16

Austempered Ductile Iron ADI offers low cost, design flexibility, good machinability, high strength-to-weight ratio and good toughness, wear resistance and fatigue strength because it can be cast like any other member of the Ductile Iron family, thus offering all the production advantages of a conventional Ductile Iron casting. Test coupons should be selected upon agreement between the producer and the purchaser. Originally approved in For this reason, some manufacturers prefer to machine the test bars to size or near net size with some?

Acceptable quantities of martensite may be established by agreement between the manufacturer, heat treater, and the purchaser. Excessively high levels of Si can suppress ausferrite in localized areas by stabilizing ferrite. Please read our License Agreement regarding materials data and our Privacy Policy. Copying and networking prohibited. If too high levels of carbon are present, carbon? Historical Version s – view previous versions of standard.

Addition of alloying elements when not required does not enchance the properties of ADI and merely adds to the cost of the iron. Current edition approved Feb. ADI is astj group of materials whose mechanical properties can be varied over a wide range by a suitable choice of heat treatment, as seen in the various entries in MatWeb.


When premachined test bars are to be used, it is recommended that adequate austempering be veri?

Check out our austempered ductile iron webpage for more information. In some cases, the maximum acceptable quantities of these microconstituents and the location s within the casting may be established by agreement between the manufacturer, heat treater, and the purchaser.

Austempered ductile iron ADI is a strong, light and wear resistant material. Floor, manual, squeezer, cope and drag, Hunter, Sinto and Disa molding processes. Austempered Ductile Iron ADI has all the advantages of a ductile iron casting plus mechanical properties which are superior to all cast irons and most steel forgings and castings, thanks to a special heat treat process. Combining values from the q897 systems may result in non-conformance with the standard.

In those cases where removal of test bars from actual castings has been agreed upon see Ast is not mandatory and is shown for information only. Wstm represent the best austempered ductile iron foundries in the USA and back it up with professional and ongoing service.

Its strength, fatigue strength and toughness are equal or better than steel, while its damping property is five times greater than steel.

Austempered Ductile Iron Case Study. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. This does not prevent an agreement wherein any one manufacturer in the chain of sequential operations can agree to assume full responsibility for all quality and inspection requirements.

Because of the costs associated with the use of Ni, larger additions may be cost prohibitive. Molybdenum Molybdenum is the most potent hardenability agent in ADI and may be necessary in heavy section castings to prevent the formation of pearlite.

Markets that are heavy users of this technology include: However, austempering heat treatment will tend to diminish any differences in mechanical properties.


The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite. The level of Mo should be restricted to not more than 0. Machining can be done before or after heat treatment. Silicon Silicon is one of awtm most important elements in ADI because it promotes graphite formation, decreases the solubility of carbon in austenite, increases the eutectoid temperature and inhibits the formation of bainitic carbide.

ASTM A Grade 3 () Austempered Ductile Iron

Lot size can be de? Tempered martensitic matrices may be developed for wear resistance, but lack the ductility of either as-cast Ductile Iron or ADI. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

It should be controlled as follows in Table X1. The proper alloy composition should be determined jointly by the foundry and the heat treating source. The matrix in conventional Ductile Iron is a controlled mixture of pearlite and ferrite. In section sizes over 1? The response to heat treatment is affected by the effective section size, graphite nodule count, and chemical composition. The average impact energy shall meet the requirement of Table 1.

Please contact us at webmaster matweb. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee astk Standards, at the address shown below. Austempered Ductile Iron q897 be successfully produced from ductile iron castings with a wide range of chemical compositions and con? Workmanship, Finish, and Appearance Commonly used in fabrication-to-casting conversion projects, ADI grade 2 offers mechanical performance that is often comparable to steels, without the added cost.

This agreement should include a de?