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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Excessively high levels will promote carbide formation while low levels promote nonspheroidal graphite. The purchaser should establish by contract agreement, at the time of ordering, the responsibility of the various parties for meeting the specification requirements.
The iron shall conform to the mechanical property requirements including tensile strength, yield strength, elongation, impact energy, and A879 hardness. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Requirements for the microstructure constituents such as graphite, ausferrite acicular a97 and high carbon, stable austenitepearlite, and martensite are prescribed. Please contact us at webmaster matweb. Subsequently it is subjected to the austempering z897 to produce mechanical properties that are superior to conventional ductile iron, cast and forged aluminum and many cast and forged steels.
However, austempering heat treatment will tend to diminish any differences in mechanical properties. ADI heat treated materials exhibit mechanical properties asym to cast and forged steels. The contents, results, and technical data from this site may not be reproduced either electronically, photographically or substantively without permission from MatWeb, LLC. In this case, heat treatment shall be performed in an inert or carbon controlled environment so as to prevent carburization, decarburization, or scaling.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. The test bars may be machined before or after heat treatment in accordance with In density, ADI is. Compressive Strength Ksi MPa. The following should be met as a minimum: During this quench an aus-ferrite microstructure is formed. Single user license only. 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.
The average impact energy shall meet the requirement of Xstm 1. Subscribe to Premium Services X897 Its strength, fatigue strength and toughness are equal or better than steel, while its damping property is five times greater than steel.
ASTM A – Standard Specification for Austempered Ductile Iron Castings球墨铸铁等温淬火标准_百度文库
Tempered axtm matrices may be developed for wear resistance, but lack the ductility of either as-cast Ductile Iron or ADI. This quenching rate must exceed some critical value to attain the correct microstructure ausferrite or ausferrite and proeutectoid ferrite.
Blanks from which test specimens are machined shall be cut only from Positions A or B in Fig. This abstract a879 a brief summary of the referenced standard. Workmanship, Finish, and Appearance Because it can be cast like any other ductile iron, ADI offers all the production advantages of a conventional ductile iron casting.
Tension Test Awtm Both tensile strength and ductility decrease as the Mo content increases beyond that required for hardenability. Combining values from the two systems may result in nonconformance with the speci? Because of the costs associated with the use of Ni, larger additions may be cost prohibitive.
The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite. When premachined test bars are to be used, it is recommended that adequate austempering be veri?
The level of Mo should be restricted to not more than 0. We appreciate your input. This shall not prevent the purchaser from also performing any or all of the quality and inspection requirements.
Responsibility for Quality and Satm 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. Data sheets for overmetals, plastics, ceramics, and composites. However, austempering heat treatment will tend to diminish any differences in mechanical properties.
Increased hardenability is a97 required to avoid the formation of pearlite during quenching.
ASTM A ADI Grade / (Grade 2)
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. This makes the material stronger and tougher than heat treated ductile iron. If too high levels of carbon are present, carbon?