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. It is informational only and not an official asttm of the standard; the full text of the standard itself must be referred to for its use and application. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Floor, manual, squeezer, cope and drag, Hunter, Sinto and Disa molding processes. The iron shall conform to the mechanical property requirements including tensile strength, yield strength, elongation, impact energy, and Brinell hardness. Machining can be done before or w897 heat treatment.
The form of this agreement depends upon which of the conditions in This specification covers ductile iron castings that are subsequently heat treated by an austempering process. This shall not prevent the purchaser from also performing any or all of the quality and inspection requirements. Blanks from which test specimens are machined shall be cut only from Positions A or B in Fig. If test bars are to be cut from castings, test bar location shall be agreed upon by the purchaser and the manufacturer and indicated on the casting drawing.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Austempered ductile iron ADI is a strong, light and wear resistant material. ADI heat treated materials exhibit mechanical properties equivalent to cast and forged steels. Lower temperature quench would give it a higher strength with abrasion resistance. We appreciate your input.
The average impact energy ast meet the requirement of Table ast. However, austempering heat treatment will tend to diminish any differences in mechanical properties. In this case, either of the test specimens shown in Fig.
It also depends on the capabilities of the speci? However, austempering heat treatment will tend to diminish any differences in mechanical properties.
Within the text, the SI units are shown in brackets [ ]. Excessively high levels of Si can suppress ausferrite in localized areas by stabilizing ferrite. The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite. Single user license only.
If you feel that your comments have not received a fair hearing you should aa897 your views known to aatm ASTM Committee on Standards, at the address shown below. The composition reported herein does not guarantee ADI properties, nor is it mandatory.
ASTM A is an alloyed nodular iron which is heat treated to achieve the desired properties. In section sizes up to 1? Appendix X2 provides guidelines for selection of coupons with mold cooling rates representative of various casting sections.
Castings shall be heat treated by an austempering process detailed in this specification. Tension test specimens shall be machined only from Positions A preferred or B in Fig. When inadequate austempering response is identi? The impact test specimens must be? Both tensile strength and ductility decrease as the Mo content increases beyond that required for hardenability. Ductile iron, with its relative ease of use and low cost of manufacture, has been one of the largest beneficiaries of the austempering process.
Grade 1 ADI would be quenched at a higher temperature range, giving it a higher toughness with abrasion resistance.
The exact procedure to be used for producing test specimens shall be agreed upon by the manufacturer and the purchaser. When premachined test bars are to be used, it is recommended that adequate austempering be veri? Link to Active This link will always route to the current Active version of the standard.
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. To see MatWeb’s complete data sheet for this material including material property data, metal compositions, material suppliers, etcplease click the button below.
Molybdenum Molybdenum is the most potent hardenability agent in ADI and may be necessary in heavy section castings to prevent the formation of pearlite.
ASTM A – Standard Specification for Austempered Ductile Iron Castings球墨铸铁等温淬火标准_百度文库
Composition guidelines are recommended in Table X1. We deal strictly in the aastm of castings and machined castings. Specimens are to be prepared unnotched to dimensions in Fig.
The grade of ADI is determined by the chemistry of the metal at the foundry level and the quench temperature utilized at the heat treating company. ADI Design Benefits Heat treating ADI involves a complicated quenching process in a liquid salt solution that is kept at a strictly controlled temperature.
Addition of alloying elements when not required does not enchance the properties of ADI and merely adds to the cost of the iron.