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.
|Published (Last):||19 October 2009|
|PDF File Size:||6.40 Mb|
|ePub File Size:||3.66 Mb|
|Price:||Free* [*Free Regsitration Required]|
It should be controlled as follows in Table X1. The 10 mm ball and kg load shall be used unless otherwise speci? The purchaser should establish by contract agreement, at the time of ordering, the responsibility of the various parties for meeting the speci? We appreciate your input.
Link to Active This link will always route to the current Active version of the standard. Workmanship, Finish, and Appearance Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
This makes the material stronger and tougher than heat treated ductile iron.
Even though ADI has great abrasion resistance properties it can also be machined. The composition reported herein does not guarantee ADI properties, nor is it mandatory. Consequently it is subjected to the austempering process to produce mechanical properties that are superior to conventional ductile iron, cast and forged aluminum and many cast and forged steels. Castings shall be heat treated by an austempering process detailed in this specification.
Grade 1 ADI asrm be quenched at a higher temperature range, giving it a higher toughness with abrasion resistance. Blanks from which test specimens are machined shall be cut only from Positions A or B in Fig. Machining can be done before or after heat treatment. Check out our austempered ductile iron webpage for more information. Its strength, fatigue strength and toughness are equal a8997 better than steel, while its damping property is five times greater than steel.
This specification covers ductile iron castings that are subsequently heat treated by an austempering process. The average impact energy shall meet the requirement of Table 1.
The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite. It also depends on the capabilities of asmt speci?
Excessively high levels of Si can suppress ausferrite in localized areas by stabilizing ferrite. ADI is a 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.
Austempered Ductile Iron can be successfully produced from ductile iron castings with a wide range of chemical compositions and con? When separately cast test coupons are used, selection shall be as outlined in Questions or comments about MatWeb? When inadequate austempering response is identi? Appendix X2 provides guidelines for selection of coupons with mold cooling rates representative of various casting sections.
Silicon Silicon is one of the 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. ADI offers one of the best combinations when it comes to lower costs, design flexibility, machinability and strength-to-weight ratio.
Responsibility for Quality and Inspection The iron shall conform to the mechanical property requirements including tensile strength, yield strength, elongation, impact energy, and Brinell hardness. In section sizes over 1? To see MatWeb’s complete data sheet for this material including material property data, metal compositions, material suppliers, etcplease click the button below.
We offer highly specialized expertise in austempered ductile iron. The standard specimens for tension and Charpy impact tests are illustrated.
Copper Copper may be added to ADI to increase hardenability in additions up to 0. Combining values from the two systems may result in non-conformance with the standard.
The z897 is uniformly formed with aus-ferrite and graphite nodules. Above this level, Cu creates a diffusion barrier around the graphite nodules, thus inhibiting carbon mobility asfm austenitizing. Impact Test Specimens Pouring molten grey iron metal from holding furnace into pouring ladle at a grey iron casting company. Magnesium Magnesium is added to create the conditions for graphite nodules to form.
Acceptable quantities of martensite may be established by agreement between the manufacturer, heat treater, and the purchaser. Compressive Strength Ksi MPa.
ASTM A – Standard Specification for Austempered Ductile Iron Castings球墨铸铁等温淬火标准_百度文库
For this reason, some manufacturers prefer to machine the test bars to size or near net size with some? Test coupons should be selected upon agreement between the producer and the purchaser. Addition of alloying elements when not required does not enchance the properties of ADI and merely adds to the cost of the iron.
Any of the aforementioned nonconforming conditions will reduce the toughness of an ADI component, even if adequate for conventional ductile iron.
However, austempering heat treatment will tend to diminish any differences in mechanical properties.