Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel
In the temperature range of 1000 °C–1150 °C and the holding time range of 30–150 min, the effect of niobium (Nb) on the behavior of grain growth and the evolution pattern of the mechanical properties of a martensitic stainless steel was studied. This study found that the addition of Nb allowed a lar...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac5072 |
| _version_ | 1797746659991486464 |
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| author | Shuai Tian Zhenbao Liu Renli Fu Xiaohui Wang |
| author_facet | Shuai Tian Zhenbao Liu Renli Fu Xiaohui Wang |
| author_sort | Shuai Tian |
| collection | DOAJ |
| description | In the temperature range of 1000 °C–1150 °C and the holding time range of 30–150 min, the effect of niobium (Nb) on the behavior of grain growth and the evolution pattern of the mechanical properties of a martensitic stainless steel was studied. This study found that the addition of Nb allowed a large amount of undissolved NbC phase to be present in the steel, that the dragging effect of the solute atoms such as solute Nb and Mo reduced the migration rate of the grain boundary , and the pinning effect of NbC hindered the growth of grains, and that the growth rate of grains in 0.11Nb steel was slow in the temperature range of 1000 °C–1080 °C and increased significantly at the temperature range of 1080 °C–1150 °C. Next, the kinetic equations of the grain growth of 0.002Nb steel and 0.11Nb steel were constructed. The second phase strengthening of NbC and the fine grain strengthening jointly increased the yield strength of the steel but reduced the plasticity and ultimate tensile strength (UTS) of the steel. The addition of Nb had a minor effect on the content of retained austenite in the steel, but its refining effect on the hierarchical martensite microstructure increased the number of nucleation sites of retained austenite, reduced their sizes, made their distribution more dispersed, and more effectively hindered crack propagation, thus improving the toughness of the steel. |
| first_indexed | 2024-03-12T15:41:00Z |
| format | Article |
| id | doaj.art-3dd53da76a6c4d89860924f4d056459c |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:41:00Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-3dd53da76a6c4d89860924f4d056459c2023-08-09T15:58:50ZengIOP PublishingMaterials Research Express2053-15912022-01-019202651110.1088/2053-1591/ac5072Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steelShuai Tian0https://orcid.org/0000-0002-1315-7360Zhenbao Liu1Renli Fu2https://orcid.org/0000-0001-6449-7974Xiaohui Wang3College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, People’s Republic of China; Institute for Special Steel Institute, Central Iron and Steel Research Institute , Beijing 100081, People’s Republic of ChinaInstitute for Special Steel Institute, Central Iron and Steel Research Institute , Beijing 100081, People’s Republic of ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, People’s Republic of ChinaInstitute for Special Steel Institute, Central Iron and Steel Research Institute , Beijing 100081, People’s Republic of ChinaIn the temperature range of 1000 °C–1150 °C and the holding time range of 30–150 min, the effect of niobium (Nb) on the behavior of grain growth and the evolution pattern of the mechanical properties of a martensitic stainless steel was studied. This study found that the addition of Nb allowed a large amount of undissolved NbC phase to be present in the steel, that the dragging effect of the solute atoms such as solute Nb and Mo reduced the migration rate of the grain boundary , and the pinning effect of NbC hindered the growth of grains, and that the growth rate of grains in 0.11Nb steel was slow in the temperature range of 1000 °C–1080 °C and increased significantly at the temperature range of 1080 °C–1150 °C. Next, the kinetic equations of the grain growth of 0.002Nb steel and 0.11Nb steel were constructed. The second phase strengthening of NbC and the fine grain strengthening jointly increased the yield strength of the steel but reduced the plasticity and ultimate tensile strength (UTS) of the steel. The addition of Nb had a minor effect on the content of retained austenite in the steel, but its refining effect on the hierarchical martensite microstructure increased the number of nucleation sites of retained austenite, reduced their sizes, made their distribution more dispersed, and more effectively hindered crack propagation, thus improving the toughness of the steel.https://doi.org/10.1088/2053-1591/ac5072ultrahigh-strength stainless steelgrain growth modelNbCretained austenitemechanical properties |
| spellingShingle | Shuai Tian Zhenbao Liu Renli Fu Xiaohui Wang Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel Materials Research Express ultrahigh-strength stainless steel grain growth model NbC retained austenite mechanical properties |
| title | Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel |
| title_full | Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel |
| title_fullStr | Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel |
| title_full_unstemmed | Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel |
| title_short | Effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh-strength stainless steel |
| title_sort | effect of niobium alloying on the austenite grain growth and mechanical properties of ultrahigh strength stainless steel |
| topic | ultrahigh-strength stainless steel grain growth model NbC retained austenite mechanical properties |
| url | https://doi.org/10.1088/2053-1591/ac5072 |
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