Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides
In this study, low-pressure gas nitriding (gas pressure of 0.01 MPa) was conducted to produce a thicker nitrided layer with high hardness and anti-corrosive properties on AISI 304 austenitic stainless steel. The effects of nitriding temperature and duration on the microstructure and surface property...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab9bef |
| _version_ | 1827868729216598016 |
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| author | Wenzhi Xie Yunxia Chen Dazhi Chen Yang Yang Chengsong Zhang Guodong Cui Yixue Wang |
| author_facet | Wenzhi Xie Yunxia Chen Dazhi Chen Yang Yang Chengsong Zhang Guodong Cui Yixue Wang |
| author_sort | Wenzhi Xie |
| collection | DOAJ |
| description | In this study, low-pressure gas nitriding (gas pressure of 0.01 MPa) was conducted to produce a thicker nitrided layer with high hardness and anti-corrosive properties on AISI 304 austenitic stainless steel. The effects of nitriding temperature and duration on the microstructure and surface property of nitrided layers were systematically evaluated by using optical microscope, X-ray diffraction, elemental analysis, microhardness test and potentiodynamic polarization tests. The samples were also treated under conventional gas pressure of 0.1 MPa for comparison. The results show that the low-pressure gas nitriding could restrain the precipitation of chromium nitrides effectively, which is beneficial for obtaining a thicker nitrided layer. Although the activation energy of nitrogen diffusion for low-pressure nitriding (220 kJ mol ^−1 ) is higher than that for the atmospheric pressure nitriding (196 kJ mol ^−1 ), the thickness of nitrided layers for low pressure nitriding could reach to a comparable value as that for the conventional atmospheric pressure nitriding. More importantly, the surface toughness and corrosion resistance of nitrided layers could be improved by low-pressure nitriding, which is mainly attributed to the optimized nitrogen content in nitrided layers and the reduced precipitation of chromium nitrides under low-pressure. |
| first_indexed | 2024-03-12T15:35:33Z |
| format | Article |
| id | doaj.art-9ab630c9fd7f422c97b70a8b10b371f9 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:35:33Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-9ab630c9fd7f422c97b70a8b10b371f92023-08-09T16:14:57ZengIOP PublishingMaterials Research Express2053-15912020-01-017606640610.1088/2053-1591/ab9befLow-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitridesWenzhi Xie0https://orcid.org/0000-0001-6366-0784Yunxia Chen1Dazhi Chen2Yang Yang3Chengsong Zhang4https://orcid.org/0000-0003-1527-5691Guodong Cui5Yixue Wang6School of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, People’s Republic of ChinaSchool of Mechanical Engineering, Shanghai Dianji University , Shanghai 201306, People’s Republic of ChinaSchool of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, People’s Republic of ChinaKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology , Maanshan 243002, People’s Republic of ChinaSchool of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, People’s Republic of ChinaSchool of Material Science and Engineering, Southwest Jiaotong University , Chengdu 610031, People’s Republic of ChinaSchool of Materials Engineering, Shanghai University of Engineering Science , Shanghai 201620, People’s Republic of ChinaIn this study, low-pressure gas nitriding (gas pressure of 0.01 MPa) was conducted to produce a thicker nitrided layer with high hardness and anti-corrosive properties on AISI 304 austenitic stainless steel. The effects of nitriding temperature and duration on the microstructure and surface property of nitrided layers were systematically evaluated by using optical microscope, X-ray diffraction, elemental analysis, microhardness test and potentiodynamic polarization tests. The samples were also treated under conventional gas pressure of 0.1 MPa for comparison. The results show that the low-pressure gas nitriding could restrain the precipitation of chromium nitrides effectively, which is beneficial for obtaining a thicker nitrided layer. Although the activation energy of nitrogen diffusion for low-pressure nitriding (220 kJ mol ^−1 ) is higher than that for the atmospheric pressure nitriding (196 kJ mol ^−1 ), the thickness of nitrided layers for low pressure nitriding could reach to a comparable value as that for the conventional atmospheric pressure nitriding. More importantly, the surface toughness and corrosion resistance of nitrided layers could be improved by low-pressure nitriding, which is mainly attributed to the optimized nitrogen content in nitrided layers and the reduced precipitation of chromium nitrides under low-pressure.https://doi.org/10.1088/2053-1591/ab9beflow-pressure gas nitridingAISI 304 steelprecipitation of chromium nitrides |
| spellingShingle | Wenzhi Xie Yunxia Chen Dazhi Chen Yang Yang Chengsong Zhang Guodong Cui Yixue Wang Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides Materials Research Express low-pressure gas nitriding AISI 304 steel precipitation of chromium nitrides |
| title | Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides |
| title_full | Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides |
| title_fullStr | Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides |
| title_full_unstemmed | Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides |
| title_short | Low-pressure gas nitriding of AISI 304 austenitic stainless steel: reducing the precipitation of chromium nitrides |
| title_sort | low pressure gas nitriding of aisi 304 austenitic stainless steel reducing the precipitation of chromium nitrides |
| topic | low-pressure gas nitriding AISI 304 steel precipitation of chromium nitrides |
| url | https://doi.org/10.1088/2053-1591/ab9bef |
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