The influence of aging treatment on the microstructural and mechanical behavior by ultra-micro hardness tester in Ni-rich NiTi alloy

Autores/as

  • Naiara Vieira Le Sénéchal Instituto Militar de Engenharia http://orcid.org/0000-0003-4992-5656
  • Rodolfo Teixeira Instituto Militar de Engenharia
  • Patrícia Freitas Rodrigues Faculdade de Ciência e Tecnologia da Universidade de Coimbra
  • Shimeni Baptista Ribeiro Centro Universitário de Volta Redonda
  • Andersan dos Santos Paula Instituto Militar de Engenharia

DOI:

https://doi.org/10.47385/cadunifoa.v16.n47.3810

Palabras clave:

Shape Memory alloys. NiTi. Thermomechanical Process. Synchrotron Radiation. Heat Treatments.

Resumen

The present study aims to assess the superelasticity behavior in Ni-rich NiTi alloy wire produced by rotary forging process. The thermomechanical process involved four steps of hot working at 800ºC, two steps of cold working with solution heat treatment at 800ºC between them, and subsequently a solution heat treatment (950ºC during 2 hours) followed by aging treatment at 350, 400 and 450 ºC during 30 minutes. X-ray diffraction (XRD) and instrumented ultra-micro hardness testers evaluated the present phase at each aged sample and were compared with their mechanical behavior. The results put in evidence the work-hardening effect on a forged condition associated with the final step of cold rotary forging. The solution treatment promotes stress relaxation and precipitate dissolution. The sample heat-treated shows the presence of the precipitated (Ni4Ti3) and R phase. The presence of these precipitates is beneficial because precipitation-hardening increases the yield strength of austenite, which in turn contributes to better functional stability.

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Biografía del autor/a

Naiara Vieira Le Sénéchal, Instituto Militar de Engenharia

Departamento de Ciência dos Materiais - Área: Materiais Metálicos

Rodolfo Teixeira, Instituto Militar de Engenharia

Departamento de Ciência dos Materiais - Área: Materiais Metálicos

Patrícia Freitas Rodrigues, Faculdade de Ciência e Tecnologia da Universidade de Coimbra

CEMMPRE Departamento de Engenharia Mecânica

Andersan dos Santos Paula, Instituto Militar de Engenharia

Departamento de Ciência dos Materiais - Área: Materiais Metálicos

Citas

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Publicado

2021-11-26

Cómo citar

LE SÉNÉCHAL, Naiara Vieira; TEIXEIRA, Rodolfo; RODRIGUES, Patrícia Freitas; RIBEIRO, Shimeni Baptista; PAULA, Andersan dos Santos. The influence of aging treatment on the microstructural and mechanical behavior by ultra-micro hardness tester in Ni-rich NiTi alloy. Cadernos UniFOA, Volta Redonda, v. 16, n. 47, 2021. DOI: 10.47385/cadunifoa.v16.n47.3810. Disponível em: https://unifoa.emnuvens.com.br/cadernos/article/view/3810. Acesso em: 21 nov. 2024.

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Sección

Tecnologia e Engenharias

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