Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment
The effect of quenching and partitioning (Q&P) processing on strength, ductility and fracture toughness is considered in a 0.33% C-1.8% Si-1.44 Mn-0.58% Cr steel. The steel was fully austenitized at 900 °C and quenched to 210 °C for 30 s. Partitioning at 350 °C for 600 s produces a martensitic m...
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| Format: | Article |
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MDPI AG
2023-09-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/10/1431 |
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| author | Evgeniy Tkachev Sergey Borisov Yuliya Borisova Tatiana Kniaziuk Rustam Kaibyshev |
| author_facet | Evgeniy Tkachev Sergey Borisov Yuliya Borisova Tatiana Kniaziuk Rustam Kaibyshev |
| author_sort | Evgeniy Tkachev |
| collection | DOAJ |
| description | The effect of quenching and partitioning (Q&P) processing on strength, ductility and fracture toughness is considered in a 0.33% C-1.8% Si-1.44 Mn-0.58% Cr steel. The steel was fully austenitized at 900 °C and quenched to 210 °C for 30 s. Partitioning at 350 °C for 600 s produces a martensitic matrix with transition carbides, bainitic ferrite and film-like retained austenite (RA) that is stable against transformation to strain-induced martensite under tension. This processing provided the highest strength and fracture toughness but the lowest ductility and product of strength and elongation (PSE), <i>σ</i><sub>B</sub>·<i>δ</i> (MPa·%). Partitioning at 500 °C produced RA with a relatively low carbon content and low volume fraction of carbides. The steel after this Q&P processing exhibits the highest ductility and PSE but low YS and Charpy V-notch (CVN) impact toughness. High ductility and PSE correlate with the ability of RA to transform into strain-induced martensite, while high strength and impact toughness are associated with the high-volume fraction of transition carbides in the carbon-depleted martensitic matrix and a lack of transformation of RA to strain-induced martensite. The highest CVN impact energy was attained in the steel exhibiting transgranular quasi-cleavage fracture with the lowest effective grain size for brittle fracture. No correlation between strength, ductility and fracture toughness is observed in Q&P steels if these materials have distinct structural constituents. |
| first_indexed | 2024-03-10T21:19:43Z |
| format | Article |
| id | doaj.art-7125b283f49f45b5a71538c3f1b89c54 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T21:19:43Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-7125b283f49f45b5a71538c3f1b89c542023-11-19T16:09:08ZengMDPI AGCrystals2073-43522023-09-011310143110.3390/cryst13101431Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) TreatmentEvgeniy Tkachev0Sergey Borisov1Yuliya Borisova2Tatiana Kniaziuk3Rustam Kaibyshev4Laboratory of Advanced Steels for Agricultural Machinery, Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, 127550 Moscow, RussiaLaboratory of Advanced Steels for Agricultural Machinery, Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, 127550 Moscow, RussiaThe effect of quenching and partitioning (Q&P) processing on strength, ductility and fracture toughness is considered in a 0.33% C-1.8% Si-1.44 Mn-0.58% Cr steel. The steel was fully austenitized at 900 °C and quenched to 210 °C for 30 s. Partitioning at 350 °C for 600 s produces a martensitic matrix with transition carbides, bainitic ferrite and film-like retained austenite (RA) that is stable against transformation to strain-induced martensite under tension. This processing provided the highest strength and fracture toughness but the lowest ductility and product of strength and elongation (PSE), <i>σ</i><sub>B</sub>·<i>δ</i> (MPa·%). Partitioning at 500 °C produced RA with a relatively low carbon content and low volume fraction of carbides. The steel after this Q&P processing exhibits the highest ductility and PSE but low YS and Charpy V-notch (CVN) impact toughness. High ductility and PSE correlate with the ability of RA to transform into strain-induced martensite, while high strength and impact toughness are associated with the high-volume fraction of transition carbides in the carbon-depleted martensitic matrix and a lack of transformation of RA to strain-induced martensite. The highest CVN impact energy was attained in the steel exhibiting transgranular quasi-cleavage fracture with the lowest effective grain size for brittle fracture. No correlation between strength, ductility and fracture toughness is observed in Q&P steels if these materials have distinct structural constituents.https://www.mdpi.com/2073-4352/13/10/1431quenching and partitioningmartensitelow-alloy steelimpact toughnesstensile propertiesmicrostructure |
| spellingShingle | Evgeniy Tkachev Sergey Borisov Yuliya Borisova Tatiana Kniaziuk Rustam Kaibyshev Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment Crystals quenching and partitioning martensite low-alloy steel impact toughness tensile properties microstructure |
| title | Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment |
| title_full | Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment |
| title_fullStr | Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment |
| title_full_unstemmed | Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment |
| title_short | Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment |
| title_sort | relationships between strength ductility and fracture toughness in a 0 33c steel after quenching and partitioning q p treatment |
| topic | quenching and partitioning martensite low-alloy steel impact toughness tensile properties microstructure |
| url | https://www.mdpi.com/2073-4352/13/10/1431 |
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