Metallurgical Effects of Niobium in Dual Phase Steel
Dual phase (DP) steels are widely applied in today’s automotive body design. The favorable combination of strength and ductility in such steels is in first place related to the share of ferrite and martensite. The pronounced work hardening behavior prevents localized thinning and allows excellent st...
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| Format: | Article |
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MDPI AG
2020-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/4/504 |
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| author | Hardy Mohrbacher Jer-Ren Yang Yu-Wen Chen Johannes Rehrl Thomas Hebesberger |
| author_facet | Hardy Mohrbacher Jer-Ren Yang Yu-Wen Chen Johannes Rehrl Thomas Hebesberger |
| author_sort | Hardy Mohrbacher |
| collection | DOAJ |
| description | Dual phase (DP) steels are widely applied in today’s automotive body design. The favorable combination of strength and ductility in such steels is in first place related to the share of ferrite and martensite. The pronounced work hardening behavior prevents localized thinning and allows excellent stretch forming. Niobium microalloying was originally introduced to dual phase steel for improving bendability by refining the microstructure. More recently developed “high ductility” (HD) DP steel variants provide increased drawability aided by a small share of austenite retained in the microstructure. In this variant niobium microalloying produces grain refinement and produces a dispersion of nanometer-sized carbide precipitates in the steel matrix which additionally contributes to strength. This study investigates the microstructural evolution and progress of niobium precipitation during industrial processing of high-ductility DP 980. The observations are interpreted considering the solubility and precipitation kinetics of niobium. The influences of niobium on microstructural characteristics and its contributions to strength and formability are discussed. |
| first_indexed | 2024-03-10T20:30:42Z |
| format | Article |
| id | doaj.art-20f911befcd741a69ab605ec46772901 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T20:30:42Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-20f911befcd741a69ab605ec467729012023-11-19T21:24:57ZengMDPI AGMetals2075-47012020-04-0110450410.3390/met10040504Metallurgical Effects of Niobium in Dual Phase SteelHardy Mohrbacher0Jer-Ren Yang1Yu-Wen Chen2Johannes Rehrl3Thomas Hebesberger4NiobelCon BV, B-2970 Schilde, BelgiumDepartment of Materials Science and Engineering, National Taiwan University, Taipei 106, TaiwanDepartment of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwanvoestalpine Stahl GmbH, voestalpine-Strasse 3, 4020 Linz, Austriavoestalpine Stahl GmbH, voestalpine-Strasse 3, 4020 Linz, AustriaDual phase (DP) steels are widely applied in today’s automotive body design. The favorable combination of strength and ductility in such steels is in first place related to the share of ferrite and martensite. The pronounced work hardening behavior prevents localized thinning and allows excellent stretch forming. Niobium microalloying was originally introduced to dual phase steel for improving bendability by refining the microstructure. More recently developed “high ductility” (HD) DP steel variants provide increased drawability aided by a small share of austenite retained in the microstructure. In this variant niobium microalloying produces grain refinement and produces a dispersion of nanometer-sized carbide precipitates in the steel matrix which additionally contributes to strength. This study investigates the microstructural evolution and progress of niobium precipitation during industrial processing of high-ductility DP 980. The observations are interpreted considering the solubility and precipitation kinetics of niobium. The influences of niobium on microstructural characteristics and its contributions to strength and formability are discussed.https://www.mdpi.com/2075-4701/10/4/504transmission electron microscopyniobium solubilityniobium precipitation kineticsparticle strengtheningmicrostructural refinementpearlite spheroidization |
| spellingShingle | Hardy Mohrbacher Jer-Ren Yang Yu-Wen Chen Johannes Rehrl Thomas Hebesberger Metallurgical Effects of Niobium in Dual Phase Steel Metals transmission electron microscopy niobium solubility niobium precipitation kinetics particle strengthening microstructural refinement pearlite spheroidization |
| title | Metallurgical Effects of Niobium in Dual Phase Steel |
| title_full | Metallurgical Effects of Niobium in Dual Phase Steel |
| title_fullStr | Metallurgical Effects of Niobium in Dual Phase Steel |
| title_full_unstemmed | Metallurgical Effects of Niobium in Dual Phase Steel |
| title_short | Metallurgical Effects of Niobium in Dual Phase Steel |
| title_sort | metallurgical effects of niobium in dual phase steel |
| topic | transmission electron microscopy niobium solubility niobium precipitation kinetics particle strengthening microstructural refinement pearlite spheroidization |
| url | https://www.mdpi.com/2075-4701/10/4/504 |
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