Závislost mezi složením striktury matrice a únavovými vlastnostim ADI

The Relation Between Microstructure Composition and Fatigue Properties of ADI

článek v časopise - ostatní, Jost

en

The presented work deals with a high-strength variant of nodular cast iron, so-called ADI (austempered ductile iron). This material ranks among prospective structural materials and is more and more applied in all important branches of machine industry. Recently it has even been applied to castings for cyclically loaded components, i.e. gears and traversing wheels, crankshafts of motor-cars, vans and trucks, swivel pins, rail brakes, pressure pipes in oil industry etc. The microstructure composition of an ADI matrix consists especially of bainitic ferrite and stabilized austenite. However, in dependence on transformation dwell some amount of martensite can appear as well. In this work the relation between mechanical properties and microstructure composition of the matrix mixture was studied in detail for the case of ADI transformed at 380 C, with emphasis on fatigue properties.

Práce se zabývá vysokopevnostní variantou litiny s kuličkovým grafitem tzv. ADI. Tento materiál se řadí mezi perspektivní konstrukční materiály a je využíván i cyklicky namáhané součásti. Složení strukturní směsi matrice ADI sestává většínou z bainitckého feritu a stabilizovaného austenitu. Nicméně, v závislosti na délce izotermické transformace se ve struktuře matrice může objevit také určitý podíl martenzitu. V této práci byla studována závislost mezi mechanickými vlastnostmi a složením strukturní směsi matrice pro případ ADI vyrobené pomocí izotermické transformace při teplotě 380C.

The presented work deals with a high-strength variant of nodular cast iron, so-called ADI (austempered ductile iron). This material ranks among prospective structural materials and is more and more applied in all important branches of machine industry. Recently it has even been applied to castings for cyclically loaded components, i.e. gears and traversing wheels, crankshafts of motor-cars, vans and trucks, swivel pins, rail brakes, pressure pipes in oil industry etc. The microstructure composition of an ADI matrix consists especially of bainitic ferrite and stabilized austenite. However, in dependence on transformation dwell some amount of martensite can appear as well. In this work the relation between mechanical properties and microstructure composition of the matrix mixture was studied in detail for the case of ADI transformed at 380 C, with emphasis on fatigue properties.

Fatigue, ADI, stabilized austenite

2006

01.11.2006

EDIS - Žilinská univerzita

Žilina

1335-4205

Communications

8

4/2006

47–50

4