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

Alex Matos da Silva Costa; J. P. Oliveira; V. F. Pereira; C. A. Nunes; A. J. Ramirez; A. P. Tschiptschin

doi:10.1016/j.jmatprotec.2018.07.034

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

Alex Matos da Silva Costa, J. P. Oliveira, V. F. Pereira, C. A. Nunes, A. J. Ramirez, A. P. Tschiptschin

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Abstract

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 γ-γ’ 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 °C, which affected positively its mechanical strength. It was observed the FSP tool overheating at rotation speed of 400 rpm. In this condition the γ-γ’ structure was destabilized forming “γ’ free zones” at the tool shoulder. In these zones new γ-grains were formed by recrystallization. Oxygen diffusion occurred at γ-grain boundaries embrittling the γ’ 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.

Original language	English
Pages (from-to)	605-614
Number of pages	10
Journal	Journal Of Materials Processing Technology
Volume	262
DOIs	https://doi.org/10.1016/j.jmatprotec.2018.07.034
Publication status	Published - 1 Dec 2018

Keywords

Argon shielding
Friction stir processing tool
Mar-M247 superalloy
Oxidation
Wear damage
X70 steel

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title = "Ni-based Mar-M247 superalloy as a friction stir processing tool",

abstract = "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 γ-γ{\textquoteright} 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 °C, which affected positively its mechanical strength. It was observed the FSP tool overheating at rotation speed of 400 rpm. In this condition the γ-γ{\textquoteright} structure was destabilized forming “γ{\textquoteright} free zones” at the tool shoulder. In these zones new γ-grains were formed by recrystallization. Oxygen diffusion occurred at γ-grain boundaries embrittling the γ{\textquoteright} 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.",

keywords = "Argon shielding, Friction stir processing tool, Mar-M247 superalloy, Oxidation, Wear damage, X70 steel",

author = "Costa, {Alex Matos da Silva} and Oliveira, {J. P.} and Pereira, {V. F.} and Nunes, {C. A.} and Ramirez, {A. J.} and Tschiptschin, {A. P.}",

note = "The authors acknowledge FAPESP (State of Sao Paulo Research Foundation) to the scholarship funding (Process Number 2014/13772-4). The authors appreciate all experimental support provided by LNNano (CNPEM/MCTI) and recognize Petrobras by financial support.",

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AU - Costa, Alex Matos da Silva

AU - Oliveira, J. P.

AU - Pereira, V. F.

AU - Nunes, C. A.

AU - Ramirez, A. J.

AU - Tschiptschin, A. P.

N1 - The authors acknowledge FAPESP (State of Sao Paulo Research Foundation) to the scholarship funding (Process Number 2014/13772-4). The authors appreciate all experimental support provided by LNNano (CNPEM/MCTI) and recognize Petrobras by financial support.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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 γ-γ’ 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 °C, which affected positively its mechanical strength. It was observed the FSP tool overheating at rotation speed of 400 rpm. In this condition the γ-γ’ structure was destabilized forming “γ’ free zones” at the tool shoulder. In these zones new γ-grains were formed by recrystallization. Oxygen diffusion occurred at γ-grain boundaries embrittling the γ’ 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.

AB - 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 γ-γ’ 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 °C, which affected positively its mechanical strength. It was observed the FSP tool overheating at rotation speed of 400 rpm. In this condition the γ-γ’ structure was destabilized forming “γ’ free zones” at the tool shoulder. In these zones new γ-grains were formed by recrystallization. Oxygen diffusion occurred at γ-grain boundaries embrittling the γ’ 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.

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KW - Mar-M247 superalloy

KW - Oxidation

KW - Wear damage

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

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