Estudio del comportamiento de fundición CADI sometida a FCR

AUTOR(ES)
FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

19/07/2018

RESUMO

ABSTRACT Ductile Iron (DI) is a development of the iron alloys introduced in the ´50s, with free graphite in the form of nodules. Austempered Ductile Iron (ADI) is a development of DI later introduced, consisting on austempering heat treatment in order to obtain a high strength and high toughness material. Carbidic Austempered Ductile Iron (CADI) is a more recent development of DI, modified by the presence of stabilized carbides (hard particles) in order to improve its abrasion resistance but with lower impact toughness than ADI. Until now, the research on CADI was mainly related with its application as an abrasion resistant material. Its performance facing other wear mechanisms has not been fully evaluated. Therefore, for the first time, in this paper CADI Rolling contact fatigue (RCF) resistance is evaluated in order to relate the microstructure to the response under cyclic loading in point or line contacts. Samples were manufactured to a disk shape by machining cast plates and then were heat treated by austempering. The wear tests were performed in a flat washer type RCF tester. The results show that both, ADI and CADI, have similar nodularity and nodule size but when the nodule count was lower for CADI. The RCF resistance of CADI was higher than that of ADI even though both material variants had very similar hardness.

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