Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Plasma Nitriding Process
2.2. Hot Tensile Tests
2.3. Creep Tests
2.4. Characterization
3. Results and Discussion
3.1. Microstructural Characterization
3.2. Tensile and Creep Tests
3.3. Fractographic Analysis
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Element | Al | V | Fe | O | N | H | C | Total Other | Ti |
---|---|---|---|---|---|---|---|---|---|
wt % | 5.5/6.75 | 3.5/4.5 | Max. 0.4 | Max. 0.2 | Max. 0.05 | Max. 0.125 | Max. 0.1 | Max. 0.4 | balance |
Temperature (°C) | Condition | YS (MPa) | UTS (MPa) | EL (%) | RA (%) |
---|---|---|---|---|---|
500 | untreated | 525 | 576 | 8 | 23.3 |
plasma-nitrided | 679 | 741 | 8 | 40.4 | |
600 | untreated | 419 | 434 | 9 | 26.9 |
plasma-nitrided | 532 | 587 | 10 | 22.5 | |
700 | untreated | 281 | 302 | 14 | 51.8 |
plasma-nitrided | 337 | 370 | 16 | 49.0 |
Temperature (°C) | σ (MPa) | Condition | tp (h) | tf (h) | ||
---|---|---|---|---|---|---|
500 | 319 | untreated 1 | 16.000 | 0.00035 | 224.00 | 0.112 |
plasma-nitrided | 8.300 | 0.00008 | 251.27 | 0.038 | ||
600 | 125 | untreated 1 | 9.000 | 0.00140 | 102.12 | 0.286 |
plasma-nitrided | 4.000 | 0.00038 | 112.56 | 0.464 | ||
250 | untreated 1 | 0.350 | 0.03040 | 2.03 | 0.098 | |
plasma-nitrided | 0.417 | 0.00367 | 6.03 | 0.031 | ||
319 | untreated 1 | 0.067 | 0.16000 | 0.62 | 0.237 | |
plasma-nitrided | 0.042 | 0.02070 | 1.17 | 0.056 | ||
700 | 319 | untreated 1 | 0.003 | 7.54000 | 0.01 | 0.158 |
plasma-nitrided | 0.008 | 1.08000 | 0.02 | 0.022 |
Temperature (°C) | σ (MPa) | Relation |
---|---|---|
500 | 319 | 1.12 |
600 | 125 | 1.10 |
250 | 2.97 | |
319 | 1.90 | |
700 | 319 | 1.59 |
Reference | Condition | n | Qc (kJ/mol) |
---|---|---|---|
[50] | Equiaxed grain | 4.12 | 319 |
[52] | Equiaxed grain | 3.59 | 266 |
[35] | Equiaxed grain + plasma immersion ion implantation (PIII) | 3.23 | 282 |
[53] | Equiaxed grain + laser nitrided | 6.46 | 261 |
[9] | Widmanstätten + plasma carburized | 5.64 | 277 |
[33] | Widmanstätten | 4.91 | 314 |
[35] | Widmanstätten + plasma immersion ion implantation (PIII) | 5.12 | 301 |
This work | Widmanstätten plasma-nitrided | 4.00 | 298 |
References | Condition | M | C |
---|---|---|---|
This work | Widmanstätten microstructure (plasma-nitrided) | 0.979 | 0.025 |
[55] | Equiaxed grain microstructure (untreated and laser nitrided) | 0.933 | 0.069 |
[33] | Bimodal, martensitic and Widmanstätten microstructure (uncoated, and thermal barrier coating) | 1.047 | 0.082 |
[50] | Equiaxed grain microstructure (tested in air atmosphere) | 1.090 | 0.085 |
[51] | Equiaxed grain microstructure (tested in air and nitrogen atmosphere) | 1.102 | 0.092 |
[33] | Widmanstätten microstructure (untreated) | 0.968 | 0.101 |
[35] | Equiaxed grain, Widmanstätten and martensitic microstructure (plasma immersion ion implantation (PIII) treated) | 0.919 | 0.125 |
[52] | Equiaxed grain microstructure (uncoated, metallic coating, and thermal barrier coating) | 0.967 | 0.150 |
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Almeida, G.F.C.; Couto, A.A.; Reis, D.A.P.; Massi, M.; Da Silva Sobrinho, A.S.; De Lima, N.B. Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy. Metals 2018, 8, 618. https://doi.org/10.3390/met8080618
Almeida GFC, Couto AA, Reis DAP, Massi M, Da Silva Sobrinho AS, De Lima NB. Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy. Metals. 2018; 8(8):618. https://doi.org/10.3390/met8080618
Chicago/Turabian StyleAlmeida, Gisele F. C., Antônio A. Couto, Danieli A. P. Reis, Marcos Massi, Argemiro S. Da Silva Sobrinho, and Nelson B. De Lima. 2018. "Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy" Metals 8, no. 8: 618. https://doi.org/10.3390/met8080618