austempered ductile iron processing window

Austempered Ductile Iron Processing Window

The Processing Window for Austempering Ductile Iron

A PC-controlled vacuum heat treating system was used to austemper an alloyed ductile iron with 0.77%Cu and 0.5%Ni at 400°C after austenitizing at 850°C. During the progress of isothermal transformation, the resistivity of austempered ductile iron vs. time was recorded and then analyzed to determine the processing window.

The Concept of an Austempered Heat Treatment Processing Window

Austempering kinetics, microstructural changes and mechanical properties are reported for a ductile iron containing 3.52%C, 2.64%Si, 0.25%Mo, 0.25%Cu and 0.67%Mn after single and stepped austempering treatments. It is shown that optimum mechanical properties are achieved with a fully ausferrite structure of ferrite and high C austenite.

Model for prediction of processing window for austempered ...

A computer model has been developed to predict the processing window (austempering window) for austempered ductile iron (ADI). The model is a modification of an existing model for the isothermal...

A Novel Step-Up Austenitization and Austempering Heat ...

Austempered Ductile Iron (ADI) has emerged as a very important engineering material in recent years. Ductile cast iron when austenitized and isothermally heat treated in the bainitic temperature range (austempered), it produces a unique microstructure consisting of bainitic ferrite and high carbon austenite. This material is referred to as ADI.

(PDF) A Novel Step-Up Austenitization and Austempering ...

This process window depends upon austempering temperature as well as the alloy content of the ductile iron. As a result of this conventional austempering process, the …

THE AUSTEMPERING PROCESS - Applied Process

In Austempered Ductile Iron and Austempered Gray Iron, the structure is Ausferrite while Bainite forms in steel. Austempering is an isothermal heat treatment that, when applied to ferrous materials, produces a structure that is stronger and tougher than comparable structures produced with conventional heat treatments.

Carbidic Austempered Ductile Iron (CADI™) - Applied Process

Carbidic Austempered Ductile Iron (CADI™) CADI™ is a new treatment that uses a matrix of ausferrite and carbides to add strength and wear resistance to ductile iron parts. The result is a premium, engineered iron with longer life, and more wear-resistant than Grade 5 ADI.

Austempered Ductile Iron and ADI Castings

Austempered ductile iron castings, or more commonly ADI castings, is a ductile iron casting which is processed by a special heat treatment. The austempering process, with ductile iron’s superior castability, results in a material which can be used to cast complex shapes, with a greater consistency of quality, and often at less cost.

Wear Properties of Austempered Ductile Irons - Applied …

AR irons. However, CADI and Q&T ductile iron can rival the performance of some of these irons. Hardness, Rc 20 25 30 35 40 45 50 55 60 65 Volume Loss, mm 3 0 5 10 15 20 As-cast ductile iron Q&T Ductile Iron ADI ADI - interrupted quench As-cast Gray Iron AGI Austempered Steel Q&T Steel Q&T 4140 Ni-Hard Carbidic ADI Abrasion Resistant Irons CADI ...

Trattamenti termici

The austempering kinetics of a ductile iron (ADI) was studied by means of dilatometry. Small samples (10mm length, 4mm diameter) were austenitized between 850-900°C and austempered at different temperatures in the range 320-370°C.

Austempered Ductile Iron (ADI) - Applied Process

Austempered Ductile Iron (ADI) has found successful applications across many industries, including Construction and Mining, Agriculture, Automotive, Heavy Truck, and Railroad. Typical applications include: Timing Gears. CV Joints. Steering Knuckles. Sprockets, Rollers, Idlers. Suspension Housings and brackets. Wear Plates.

Successfully Machining Austempered Ductile Iron (ADI)

Austempered Ductile Iron (ADI) is a form of ductile iron that enjoys high strength and ductility as a result of its microstructure controlled through heat treatment. While conventional ductile iron was discovered in 1943 and the austempering process had been around since the 1930s, the combination of the two technologies was not commercialized until the 1970s.

Austempered Compacted Graphite Iron — Influence of ...

The austempering time between the first and second reactions is termed the ‘process window’, and can be made longer by the addition of alloying elements such as molybdenum, nickel, and copper. Austempering results in the formation of an alternate microstructure of acicular ferrite and retained austenite known as an ausferrite (bainite) matrix.

Castings in a Variety of Iron Grades and Types - Baker ...

austempered ductile iron Ductile (or nodular) iron is valued for its enhanced elasticity and high strength properties that serve even heavier loads than plain ductile iron. It is easily cast and machined, and it is as corrosion resistant as gray iron.

The Effects of Molybdenum and Manganese on the …

The standard processing window depends on the austempering parameters and alloying elements, as well as the method used to produce ADI. Keywords: alloying elements; austempered ductile iron; austempering parameters; ductile iron; mechanical properties

The role of chromium during austempering of ductile iron ...

Dec 01, 2020 · The present work analyzes the effect of small additions of chromium in the final structure of a commercial Austempered Ductile Iron (ADI). The study is made with emphasis on the effect of this element on the processing window. The results indicate that chromium addition decreases the stability of austenite promoting the martensitic transformation during cooling …

Investigating the Austempering Parameters of Ductile Iron ...

The optimum mechanical properties for austempered ductile iron can be achieved if the heat treatment is conducted in a restricted time and temperature frame called the “processing window”. Determining the processing window by experiments is time consuming and expensive, and hence it is attractive to utilize non-destructive techniques.

The austempering study of alloyed ductile iron - ScienceDirect

Austempered ductile iron (ADI) proved to be an excellent material as it possesses attractive properties: high strength, ductility and toughness are combined with …

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