Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel
High-pressure torsion (HPT) is known as an effective severe plastic deformation (SPD) technique to produce bulk ultrafine-grained (UFG) metals and alloys by the application of combined compressive force and torsional shear strains on thin disk samples. In this study, the microstructures and microhar...
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| Format: | Article |
| Language: | English |
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MDPI
2021
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| Online Access: | http://eprints.utm.my/94121/1/ShahirMohdYusuf2021_InfluenceofHighPressureTorsion.pdf |
| _version_ | 1796865759539888128 |
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| author | Mohd. Yusuf, Shahir Chen, Ying Gao, Nong |
| author_facet | Mohd. Yusuf, Shahir Chen, Ying Gao, Nong |
| author_sort | Mohd. Yusuf, Shahir |
| collection | ePrints |
| description | High-pressure torsion (HPT) is known as an effective severe plastic deformation (SPD) technique to produce bulk ultrafine-grained (UFG) metals and alloys by the application of combined compressive force and torsional shear strains on thin disk samples. In this study, the microstructures and microhardness evolution of an additively manufactured (AM) 316L stainless steel (316L SS) processed through 5 HPT revolutions are evaluated at the central disk area, where the effective shear strains are relatively low compared to the peripheral regions. Scanning electron microscopy (SEM) analysis showed that the cellular network sub-structures in AM 316L SS were destroyed after 5 HPT revolutions. Transmission electron microscopy (TEM) observations revealed non-equilibrium ultra-fine grained (UFG) microstructures (average grain size: ~115 nm) after 5 revolutions. Furthermore, energy dispersive x-ray spectroscopy (EDX) analysis suggested that spherical Cr-based nano-silicates are also found in the as-received condition, which are retained even after HPT processing. Vick-ers microhardness (HV) measurements indicated significant increase in average hardness values from ~220 HV before HPT processing to ~560 HV after 5 revolutions. Quantitative X-ray diffraction (XRD) patterns exhibit a considerable increase in dislocation density from ~0.7 × 1013 m−2 to ~1.04 × 1015 m−2. The super-high average hardness increment after 5 HPT revolutions is predicted to be attributed to the UFG grain refinement, significant increase in dislocation densities and the presence of the Cr-based nano-silicates, according to the model established based on the linear additive theory. |
| first_indexed | 2024-03-05T21:01:58Z |
| format | Article |
| id | utm.eprints-94121 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T21:01:58Z |
| publishDate | 2021 |
| publisher | MDPI |
| record_format | dspace |
| spelling | utm.eprints-941212022-02-28T13:32:18Z http://eprints.utm.my/94121/ Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel Mohd. Yusuf, Shahir Chen, Ying Gao, Nong Q Science (General) TA Engineering (General). Civil engineering (General) High-pressure torsion (HPT) is known as an effective severe plastic deformation (SPD) technique to produce bulk ultrafine-grained (UFG) metals and alloys by the application of combined compressive force and torsional shear strains on thin disk samples. In this study, the microstructures and microhardness evolution of an additively manufactured (AM) 316L stainless steel (316L SS) processed through 5 HPT revolutions are evaluated at the central disk area, where the effective shear strains are relatively low compared to the peripheral regions. Scanning electron microscopy (SEM) analysis showed that the cellular network sub-structures in AM 316L SS were destroyed after 5 HPT revolutions. Transmission electron microscopy (TEM) observations revealed non-equilibrium ultra-fine grained (UFG) microstructures (average grain size: ~115 nm) after 5 revolutions. Furthermore, energy dispersive x-ray spectroscopy (EDX) analysis suggested that spherical Cr-based nano-silicates are also found in the as-received condition, which are retained even after HPT processing. Vick-ers microhardness (HV) measurements indicated significant increase in average hardness values from ~220 HV before HPT processing to ~560 HV after 5 revolutions. Quantitative X-ray diffraction (XRD) patterns exhibit a considerable increase in dislocation density from ~0.7 × 1013 m−2 to ~1.04 × 1015 m−2. The super-high average hardness increment after 5 HPT revolutions is predicted to be attributed to the UFG grain refinement, significant increase in dislocation densities and the presence of the Cr-based nano-silicates, according to the model established based on the linear additive theory. MDPI 2021-10 Article PeerReviewed application/pdf en http://eprints.utm.my/94121/1/ShahirMohdYusuf2021_InfluenceofHighPressureTorsion.pdf Mohd. Yusuf, Shahir and Chen, Ying and Gao, Nong (2021) Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel. Metals, 11 (10). pp. 1-12. ISSN 2075-4701 http://dx.doi.org/10.3390/met11101553 DOI:10.3390/met11101553 |
| spellingShingle | Q Science (General) TA Engineering (General). Civil engineering (General) Mohd. Yusuf, Shahir Chen, Ying Gao, Nong Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title | Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title_full | Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title_fullStr | Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title_full_unstemmed | Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title_short | Influence of high-pressure torsion on the microstructure and microhardness of additively manufactured 316L stainless steel |
| title_sort | influence of high pressure torsion on the microstructure and microhardness of additively manufactured 316l stainless steel |
| topic | Q Science (General) TA Engineering (General). Civil engineering (General) |
| url | http://eprints.utm.my/94121/1/ShahirMohdYusuf2021_InfluenceofHighPressureTorsion.pdf |
| work_keys_str_mv | AT mohdyusufshahir influenceofhighpressuretorsiononthemicrostructureandmicrohardnessofadditivelymanufactured316lstainlesssteel AT chenying influenceofhighpressuretorsiononthemicrostructureandmicrohardnessofadditivelymanufactured316lstainlesssteel AT gaonong influenceofhighpressuretorsiononthemicrostructureandmicrohardnessofadditivelymanufactured316lstainlesssteel |