Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles
Effects of deformation strains on the microstructure and mechanical properties of bearing steel for new energy vehicles were investigated by combining thermal simulation testing machine with optical microscopy, field-emission scanning electron microscopy, electron backscatter diffraction technology,...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425001012 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832595733577990144 |
|---|---|
| author | Zhihui Chen Xiaolong Gan Man Liu Zhengliang Xue Hao Tian Desheng Li Guang Xu |
| author_facet | Zhihui Chen Xiaolong Gan Man Liu Zhengliang Xue Hao Tian Desheng Li Guang Xu |
| author_sort | Zhihui Chen |
| collection | DOAJ |
| description | Effects of deformation strains on the microstructure and mechanical properties of bearing steel for new energy vehicles were investigated by combining thermal simulation testing machine with optical microscopy, field-emission scanning electron microscopy, electron backscatter diffraction technology, scanning transmission electron microscopy and hardness tests, etc. The results show that the warm deformation of the undercooled austenite at temperatures close to Ar1 induced the γ-Fe to pearlite transformation. With the increase of deformation strain from 20% to 75%, the volume fraction of deformation-induced pearlite increased gradually, the spheroidization of cementite occurred, and the hardness of the tested steel decreased from 720 HV to 361 HV. When the deformation strain reached 75%, the micron ferrite grains with average size of 2.46 μm and nano-sized spherical carbides of 81 nm formed. EBSD results show that with increasing the deformation strain, the size of pearlite colony decreased, the size of pearlite nodules, and the proportion of high-angle grain boundaries decreased first and then increased. Moreover, the kinetic curve of the deformation-induced pearlite was fitted and the strengthening mechanism of the tested steel was analyzed. The theoretical calculation results of yield strength were in good agreement with the experimental data. |
| format | Article |
| id | doaj-art-0f43c9326e7c499294c2dfce55591349 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-0f43c9326e7c499294c2dfce555913492025-01-18T05:04:46ZengElsevierJournal of Materials Research and Technology2238-78542025-03-0135942952Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehiclesZhihui Chen0Xiaolong Gan1Man Liu2Zhengliang Xue3Hao Tian4Desheng Li5Guang Xu6The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430080, Hubei, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430080, Hubei, China; Corresponding author.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430080, Hubei, China; Corresponding author.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430080, Hubei, ChinaTechnology Center, Daye Special Co., Ltd, Huangshi, 435001, Hubei, ChinaTechnology Center, Daye Special Co., Ltd, Huangshi, 435001, Hubei, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430080, Hubei, ChinaEffects of deformation strains on the microstructure and mechanical properties of bearing steel for new energy vehicles were investigated by combining thermal simulation testing machine with optical microscopy, field-emission scanning electron microscopy, electron backscatter diffraction technology, scanning transmission electron microscopy and hardness tests, etc. The results show that the warm deformation of the undercooled austenite at temperatures close to Ar1 induced the γ-Fe to pearlite transformation. With the increase of deformation strain from 20% to 75%, the volume fraction of deformation-induced pearlite increased gradually, the spheroidization of cementite occurred, and the hardness of the tested steel decreased from 720 HV to 361 HV. When the deformation strain reached 75%, the micron ferrite grains with average size of 2.46 μm and nano-sized spherical carbides of 81 nm formed. EBSD results show that with increasing the deformation strain, the size of pearlite colony decreased, the size of pearlite nodules, and the proportion of high-angle grain boundaries decreased first and then increased. Moreover, the kinetic curve of the deformation-induced pearlite was fitted and the strengthening mechanism of the tested steel was analyzed. The theoretical calculation results of yield strength were in good agreement with the experimental data.http://www.sciencedirect.com/science/article/pii/S2238785425001012Bearing steelDeformation-induced pearlite transformation (DIPT)CarbidesUltra-fine grainsStrengthening mechanism |
| spellingShingle | Zhihui Chen Xiaolong Gan Man Liu Zhengliang Xue Hao Tian Desheng Li Guang Xu Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles Journal of Materials Research and Technology Bearing steel Deformation-induced pearlite transformation (DIPT) Carbides Ultra-fine grains Strengthening mechanism |
| title | Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| title_full | Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| title_fullStr | Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| title_full_unstemmed | Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| title_short | Deformation-induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| title_sort | deformation induced pearlite transformation and spheroidization of bearing steel for new energy vehicles |
| topic | Bearing steel Deformation-induced pearlite transformation (DIPT) Carbides Ultra-fine grains Strengthening mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425001012 |
| work_keys_str_mv | AT zhihuichen deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT xiaolonggan deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT manliu deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT zhengliangxue deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT haotian deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT deshengli deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles AT guangxu deformationinducedpearlitetransformationandspheroidizationofbearingsteelfornewenergyvehicles |