Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy
This work aimed to enhance the creep resistance of Ti-6Al-4V alloy treated by plasma nitriding. The nitriding was performed on specimens with a Widmanstätten microstructure for four hours at 690 °C under a gas atmosphere containing Ar:N2:H2 (0.455:0.455:0.090). X-ray diffraction ana...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-08-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2075-4701/8/8/618 |
| _version_ | 1828170648874123264 |
|---|---|
| author | Gisele F. C. Almeida Antônio A. Couto Danieli A. P. Reis Marcos Massi Argemiro S. da Silva Sobrinho Nelson B. de Lima |
| author_facet | Gisele F. C. Almeida Antônio A. Couto Danieli A. P. Reis Marcos Massi Argemiro S. da Silva Sobrinho Nelson B. de Lima |
| author_sort | Gisele F. C. Almeida |
| collection | DOAJ |
| description | This work aimed to enhance the creep resistance of Ti-6Al-4V alloy treated by plasma nitriding. The nitriding was performed on specimens with a Widmanstätten microstructure for four hours at 690 °C under a gas atmosphere containing Ar:N2:H2 (0.455:0.455:0.090). X-ray diffraction analysis showed that the ε-Ti2N and δ-TiN formed on the nitrided sample, in addition to the α-Ti and β-Ti matrix phases. The layer thickness of this sample was about 1 µm. Hot tensile tests were performed in the temperature range of 500 to 700 °C on nitrided and non-nitrided samples, which indicated an increased strength of the nitrided samples. The same temperature range was used for the creep tests in a stress range of 125 to 319 MPa. The plasma-nitrided samples exhibited better creep resistance when compared to the untreated samples. This result was demonstrated by the decreased secondary creep rate and the increased final creep time. This improvement in the creep resistance appeared to be associated with the formation of the nitrided layer, which worked as a barrier to oxygen diffusion into the material and due to the formation of a surface residual compressive stress. |
| first_indexed | 2024-04-12T03:13:51Z |
| format | Article |
| id | doaj.art-08a7ace2a93f4580ac918d1cd2e72433 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-12T03:13:51Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-08a7ace2a93f4580ac918d1cd2e724332022-12-22T03:50:14ZengMDPI AGMetals2075-47012018-08-018861810.3390/met8080618met8080618Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V AlloyGisele F. C. Almeida0Antônio A. Couto1Danieli A. P. Reis2Marcos Massi3Argemiro S. da Silva Sobrinho4Nelson B. de Lima5Department of Materials Engineering and Nanotechnology, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, BrazilDepartment of Materials Engineering and Nanotechnology, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, BrazilScience and Technology Department, Universidade Federal de São Paulo—UNIFESP, São José dos Campos 12231-280, BrazilDepartment of Materials Engineering and Nanotechnology, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, BrazilDepartment of Materials and Processes, Instituto Tecnológico de Aeronáutica—ITA/DCTA, São José dos Campos 12228-900, BrazilCenter for Materials Science and Technology, Instituto de Pesquisas Energéticas e Nucleares, São Paulo 05508-000, BrazilThis work aimed to enhance the creep resistance of Ti-6Al-4V alloy treated by plasma nitriding. The nitriding was performed on specimens with a Widmanstätten microstructure for four hours at 690 °C under a gas atmosphere containing Ar:N2:H2 (0.455:0.455:0.090). X-ray diffraction analysis showed that the ε-Ti2N and δ-TiN formed on the nitrided sample, in addition to the α-Ti and β-Ti matrix phases. The layer thickness of this sample was about 1 µm. Hot tensile tests were performed in the temperature range of 500 to 700 °C on nitrided and non-nitrided samples, which indicated an increased strength of the nitrided samples. The same temperature range was used for the creep tests in a stress range of 125 to 319 MPa. The plasma-nitrided samples exhibited better creep resistance when compared to the untreated samples. This result was demonstrated by the decreased secondary creep rate and the increased final creep time. This improvement in the creep resistance appeared to be associated with the formation of the nitrided layer, which worked as a barrier to oxygen diffusion into the material and due to the formation of a surface residual compressive stress.http://www.mdpi.com/2075-4701/8/8/618Ti-6Al-4Vplasma nitridinghot tensile testcreep |
| spellingShingle | Gisele F. C. Almeida Antônio A. Couto Danieli A. P. Reis Marcos Massi Argemiro S. da Silva Sobrinho Nelson B. de Lima Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy Metals Ti-6Al-4V plasma nitriding hot tensile test creep |
| title | Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy |
| title_full | Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy |
| title_fullStr | Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy |
| title_full_unstemmed | Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy |
| title_short | Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy |
| title_sort | effect of plasma nitriding on the creep and tensile properties of the ti 6al 4v alloy |
| topic | Ti-6Al-4V plasma nitriding hot tensile test creep |
| url | http://www.mdpi.com/2075-4701/8/8/618 |
| work_keys_str_mv | AT giselefcalmeida effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy AT antonioacouto effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy AT danieliapreis effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy AT marcosmassi effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy AT argemirosdasilvasobrinho effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy AT nelsonbdelima effectofplasmanitridingonthecreepandtensilepropertiesoftheti6al4valloy |