A Basic Study on Fatigue Reliability of Spheroidal Graphite Iron with High Tension and Toughness. 3rd Report. On Estimating the Fatigue Limit of Hard Shot-Peening-Treated Austempered Ductile Iron in Sand Molding.

Abstract The paper presents recent developments concerning the formation of surface layer in austempered ductile iron castings. It was found that the traditional methods used to change the properties of the surface layer, i.e. the effect of protective atmosphere during austenitising or shot peening, are not fully satisfactory to meet the demands of commercial applications. Therefore, new ways to shape the surface layer and the surface properties of austempered ductile iron castings are searched for, to mention only detonation spraying, carbonitriding, CVD methods, etc.

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Machinability and related properties of austempered ductile iron: A review

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.12.4.2018.14.0360 ◽

2018 ◽

Vol 12 (4) ◽

pp. 4180-4190

Author(s):

Ananda Hegde ◽

Sathyashankara Sharma ◽

Gowri Shankar M. C

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Wear Resistance ◽

Ductile Iron ◽

High Hardness ◽

Austempered Ductile Iron ◽

Spheroidal Graphite ◽

Light Weight ◽

Sg Iron

When the ductile iron which is also known as Spheroidal Graphite (SG) iron, is subjected to austempering heat treatment, the material is known as austempered ductile iron (ADI). This material has good mechanical properties and has various applications in different fields. This revolutionary material with its excellent combination of strength, ductility, toughness and wear resistance has the potential to replace some of the commonly used conventional materials such as steel, aluminium and other light weight alloys as it offers production advantage as well. One of the problems encountered during manufacturing is machining of ADI parts owing to its high hardness and wear resistance. Many researchers over a period of time have reported the machinability aspects of the ADI. This paper presents a review on the developments made on the machinability aspects of ADI along with other mechanical properties.

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Assessment of Machining Characteristics of Austempered Ductile Iron

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.2036 ◽

2010 ◽

Vol 97-101 ◽

pp. 2036-2039 ◽

Cited By ~ 2

Author(s):

Ashwin Polishetty ◽

Guy Littlefair

Keyword(s):

Surface Texture ◽

Ductile Iron ◽

Cutting Parameters ◽

Cutting Fluid ◽

Austempered Ductile Iron ◽

Spheroidal Graphite ◽

Surface Texture Analysis ◽

Machining Characteristics ◽

Stage Heat Treatment ◽

Cutting Speeds

Austempered Ductile Iron (ADI) is a modified Spheroidal Graphite Iron (SGI) produced by applying a two-stage heat treatment cycle of austenitising and austempering. The microstructure of ADI also known as “ausferrite” consists of ferrite, austenite and graphite nodules. Machining ADI using conventional techniques is often problematic due to the microstructural phase transformation from austenite to martensite. Machining trials consisted of drilling ADI-Grades900, 1050, 1200 and 1400 using inserted (TiAlN PVD coated) type drills. The cutting parameters selected were; cutting speeds [m/min] of 30 and 40; penetration rates [mm/rev] of 0.1 and 0.2; to a constant depth of 20mm. The machining characteristics of ADI are evaluated through surface texture analysis and microhardness analysis. These results indicate that microhardness is modified during machining and surface texture is improved using a cutting fluid.

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Low Temperature Impact Tests in Austempered Ductile Iron and Other Spheroidal Graphite Cast Iron Structures.

ISIJ International ◽

10.2355/isijinternational.41.372 ◽

2001 ◽

Vol 41 (4) ◽

pp. 372-380 ◽

Cited By ~ 10

Author(s):

P. J. J. Ratto ◽

A. F. Ansaldi ◽

V. E. Fierro ◽

F. R. Agüera ◽

H. N. Alvarez Villar ◽

...

Keyword(s):

Cast Iron ◽

Low Temperature ◽

Ductile Iron ◽

Austempered Ductile Iron ◽

Spheroidal Graphite ◽

Impact Tests ◽

Spheroidal Graphite Cast Iron ◽

Graphite Cast Iron ◽

Temperature Impact

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Effect of Shot Peening Treatment on Rolling Contact Fatigue Properties of Austempered Ductile Iron

Tribology Transactions ◽

10.1080/10402000208982590 ◽

2002 ◽

Vol 45 (4) ◽

pp. 576-582 ◽

Cited By ~ 8

Author(s):

H. Ohba ◽

S. Matsuyama ◽

T. Yamamoto

Keyword(s):

Ductile Iron ◽

Shot Peening ◽

Rolling Contact Fatigue ◽

Contact Fatigue ◽

Rolling Contact ◽

Austempered Ductile Iron ◽

Fatigue Properties

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Morphology and wear of high chromium and austempered ductile iron balls as grinding media in ball mills

Journal of Physics Conference Series ◽

10.1088/1742-6596/2070/1/012201 ◽

2021 ◽

Vol 2070 (1) ◽

pp. 012201

Author(s):

BRN Murthy ◽

Ravichandra Rangappa

Keyword(s):

Ductile Iron ◽

Research Work ◽

Milling Process ◽

Austempered Ductile Iron ◽

Spheroidal Graphite ◽

Wear Loss ◽

Ball Mills ◽

High Chromium ◽

Wear Rates ◽

Grinding Media

Abstract High chromium balls are recognized as better grinding media in terms of wear rates than forged steel balls, which are conventional grinding media in the milling process of iron ore. In this research work, the wear rate of high chromium balls and austempered ductile iron (ADI) balls as crushing media in a ball mill are compared. ADI are prepared by austenitizing the spheroidal graphite (SG) iron balls at 920 °C for one hour, and step austempering heat treatments were given, which includes the first step austenitizing at 300 °C for 15 min, followed by a second step austenitizing at 400 °C for 60 min. The wear rates were estimated when both balls were used separately by maintaining the same machining conditions and when the balls are mixed. The grinding wear conduct of both materials is evaluated for wear loss in wet grinding conditions. The experimental results reveal that the performance of ADI balls is better than high chromium balls when tested separately and mixed. Results also indicate that the wear rates/revolutions will decrease when the operating period increases.

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