Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20212348
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário

Gregory de Oliveira Miranda, Vinicius Silva dos Reis, Carlos Vinicius de Paes Santos, Fábio Alves Rabelo Júnior, Edgar Costa Cardoso, José Maria do Vale Quaresma

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Resumo

Dentre os defeitos provenientes de fadiga de contato de rolamento (RCF) nos trilhos ferroviários, o spalling se apresenta como um dos mais severos devido às suas características morfológicas. Este trabalho envolve a análise de um amostra de solda aluminotérmica de trilho ferroviário contendo um defeito do tipo spalling, nas caracterizações buscou-se fazer a correlação entre o defeito, a microestrutura e as propriedades mecânicas na região do trilho. Foram realizados ensaios de dureza e microdureza, além da caracterização microestrutural e fractográfica via microscopia óptica. Os resultados mostraram que o spalling possui uma forte tendência em ocorrer na região da Zona Termicamente Afetada (ZTA), expressa pela variação microestrutural e dureza ao longo da amostra e as trincas são influenciadas pela microestrutura deformada da superfície do trilho

Palavras-chave

Defeitos em trilhos; Caracterização; Fadiga de contato de rolamento; Spalling.

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Submetido em:
27/05/2020

Aceito em:
19/10/2020

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