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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Ni-based Mar-M247 superalloy as a friction stir processing tool

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Autor(es):
Costa, A. M. S. [1] ; Oliveira, J. P. [2, 3] ; Pereira, V. F. [1] ; Nunes, C. A. [4] ; Ramirez, A. J. [2] ; Tschiptschin, A. P. [5]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Brazilian Nanotechnol Natl Lab CNPEM, Polo 2 Alta Tecnol Campinas, BR-13083970 Campinas, SP - Brazil
[2] Ohio State Univ, Dept Mat Sci & Engn, 1248 Arthur E Adams Dr, Columbus, OH 43221 - USA
[3] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Engn Mecan & Ind, UNIDEMI, Caparica - Portugal
[4] Escola Engn Lorena USP, Polo Urboind Gleba AI-6, Caixa Postal 116, BR-12602810 Lorena, SP - Brazil
[5] Univ Sao Paulo, Dept Met & Mat Engn, BR-05508900 Sao Paulo, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Journal of Materials Processing Technology; v. 262, p. 605-614, DEC 2018.
Citações Web of Science: 1
Resumo

Ni-based superalloy Mar-M247 was evaluated as a potential tool material for friction stir processing (FSP) of X70 steel. The superalloy consists of a gamma-gamma' structure and minor precipitates, such as MC carbide. FSP tests evaluated the tool performance at different rotation and welding speeds and the effect of shielding gas was also analyzed. Prior to FSP tests, hot compression tests showed that the tool material microstructure was stable below 950 degrees C, which affected positively its mechanical strength. It was observed the FSP tool overheating at rotation speed of 400 rpm. In this condition the gamma-gamma' structure was destabilized forming ``gamma' free zones{''} at the tool shoulder. In these zones new gamma-grains were formed by recrystallization. Oxygen diffusion occurred at gamma-grain boundaries embritding the gamma' free zones that were ripped out by abrasion during FSP tests. The tool wear damage was mitigated by controlling friction processing parameters, such as rotation and welding speeds, Z-force values and gas shielding. The FSP made in this work improved surface properties of X70 steel. (AU)

Processo FAPESP: 14/13772-4 - Estudo de superligas de Co para a produção de ferramentas para soldagem por atrito com pino não consumível
Beneficiário:Alex Matos da Silva Costa
Linha de fomento: Bolsas no Brasil - Pós-Doutorado