Q&P Response of a Medium Carbon Low Alloy Steel
An Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel was subjected to quenching followed by low-temperature tempering (Q&T) and quenching and partitioning (Q&P) processing after full austenitization. The Q&P treatment led to an increase in the volume fraction of retained austenite (RA) by fa...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/4/689 |
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| author | Roman Mishnev Yuliya Borisova Sergey Gaidar Tatiana Kniaziuk Olga Vagina Rustam Kaibyshev |
| author_facet | Roman Mishnev Yuliya Borisova Sergey Gaidar Tatiana Kniaziuk Olga Vagina Rustam Kaibyshev |
| author_sort | Roman Mishnev |
| collection | DOAJ |
| description | An Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel was subjected to quenching followed by low-temperature tempering (Q&T) and quenching and partitioning (Q&P) processing after full austenitization. The Q&P treatment led to an increase in the volume fraction of retained austenite (RA) by factors ranging from 30 to 40 depending on the quenching temperature, <i>T</i><sub>q</sub>, and an additional precipitation of transition η-carbides in the martensitic matrix. The Q&P processing provided a decrease in the yield stress (YS) from 1730 to 1350 MPa and an increase in the ductility by a factor of 3; the product of strength and elongation (PSE) increased from 13.7 to 32 GPa·%. The novelty of the work lies in establishing the origin of the good ductility and high YS of Q&P steel. Blocky-type RA plays a vital role in the effect of Q&P processing on mechanical properties. The main feature of RA is a very high dislocation density proving the strength of ~1000 MPa of this structural component. The strength of RA controls the YS of the steel if its volume fraction is ≥25%. Ductility is provided by the almost full transformation of RA into strain-induced martensite under tension. The localization of plastic deformation in the form of deformation bands is associated with the γ→α′ transformation. Medium carbon Q&P steel with a high volume fraction of RA meets the requirements for advanced high-strength steel (AHSS) belonging to the third generation of AHSS due to the combination of the YS > 1050 MPa with the PSE > 30 GPa·%. |
| first_indexed | 2024-03-11T04:44:38Z |
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| id | doaj.art-6e3f82f443a142c0808013ba968db147 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T04:44:38Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-6e3f82f443a142c0808013ba968db1472023-11-17T20:26:17ZengMDPI AGMetals2075-47012023-03-0113468910.3390/met13040689Q&P Response of a Medium Carbon Low Alloy SteelRoman Mishnev0Yuliya Borisova1Sergey Gaidar2Tatiana Kniaziuk3Olga Vagina4Rustam Kaibyshev5Laboratory of Advanced Steels for Agricultural Machinery, Russian State Agrarian University–Moscow Timiryazev Agricultural Academy, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Russian State Agrarian University–Moscow Timiryazev Agricultural Academy, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Russian State Agrarian University–Moscow Timiryazev Agricultural Academy, 127550 Moscow, RussiaNational Research Center “Kurchatov Institute”–Central Research Institute of Structural Materials “Prometey”, 191015 St. Petersburg, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Russian State Agrarian University–Moscow Timiryazev Agricultural Academy, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Russian State Agrarian University–Moscow Timiryazev Agricultural Academy, 127550 Moscow, RussiaAn Fe-0.44%C-1.8%Si-1.3%Mn-0.82%Cr-0.28%Mo steel was subjected to quenching followed by low-temperature tempering (Q&T) and quenching and partitioning (Q&P) processing after full austenitization. The Q&P treatment led to an increase in the volume fraction of retained austenite (RA) by factors ranging from 30 to 40 depending on the quenching temperature, <i>T</i><sub>q</sub>, and an additional precipitation of transition η-carbides in the martensitic matrix. The Q&P processing provided a decrease in the yield stress (YS) from 1730 to 1350 MPa and an increase in the ductility by a factor of 3; the product of strength and elongation (PSE) increased from 13.7 to 32 GPa·%. The novelty of the work lies in establishing the origin of the good ductility and high YS of Q&P steel. Blocky-type RA plays a vital role in the effect of Q&P processing on mechanical properties. The main feature of RA is a very high dislocation density proving the strength of ~1000 MPa of this structural component. The strength of RA controls the YS of the steel if its volume fraction is ≥25%. Ductility is provided by the almost full transformation of RA into strain-induced martensite under tension. The localization of plastic deformation in the form of deformation bands is associated with the γ→α′ transformation. Medium carbon Q&P steel with a high volume fraction of RA meets the requirements for advanced high-strength steel (AHSS) belonging to the third generation of AHSS due to the combination of the YS > 1050 MPa with the PSE > 30 GPa·%.https://www.mdpi.com/2075-4701/13/4/689quenching and partitioningquenching and temperinglow alloy steelmechanical propertiesmicrostructurephase transformation |
| spellingShingle | Roman Mishnev Yuliya Borisova Sergey Gaidar Tatiana Kniaziuk Olga Vagina Rustam Kaibyshev Q&P Response of a Medium Carbon Low Alloy Steel Metals quenching and partitioning quenching and tempering low alloy steel mechanical properties microstructure phase transformation |
| title | Q&P Response of a Medium Carbon Low Alloy Steel |
| title_full | Q&P Response of a Medium Carbon Low Alloy Steel |
| title_fullStr | Q&P Response of a Medium Carbon Low Alloy Steel |
| title_full_unstemmed | Q&P Response of a Medium Carbon Low Alloy Steel |
| title_short | Q&P Response of a Medium Carbon Low Alloy Steel |
| title_sort | q p response of a medium carbon low alloy steel |
| topic | quenching and partitioning quenching and tempering low alloy steel mechanical properties microstructure phase transformation |
| url | https://www.mdpi.com/2075-4701/13/4/689 |
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