Resumo

MORALES, Iván; HORMAZA, Wilson  e  MENDEZ, Luis. Influence of Post Heat Treatment on the Microstructure and Abrasion Resistance of a High Chromium White Cast Iron. rev.ing. [online]. 2009, n.30, pp.41-48. ISSN 0121-4993.

The heat treatments used to improve abrasion resistance of High-Chromium white casted irons (WCI) tend to ease the retained austenite/martensite transformation temperature and favor carbide precipitation within the metallic matrix. In this paper, the effect of four different destabilization heat treatment temperatures was examined for a 26Cr2.5C2Mo WCI under means of optical microscopy. The specimens were obtained under two different casting process, regular sand-casting and permanent molding. The abrasion resistance was measured as mass loss in a dry sand/rubber wheel abrasion test according to ASTM G65. The results show that the solidification speed has a direct effect on the abrasion resistance; manly due to both the eutectic carbide size and its distribution. As predicted, the abrasion resistance of both samples was maximized under certain destabilization temperature, for which carbide size and hardness was optimized.

Palavras-chave : Heat treatment; high chromium; wear; white iron.

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