Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process
The present work focuses on the investigation of both microstructure and resulting mechanical properties of different lean medium Mn Quenching and Partitioning (Q&P) steels with 0.2 wt.% C, 1.5 wt.% Si, and 3−4 wt.% Mn. By means of dilatometry, a significant influence of the Mn-con...
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MDPI AG
2019-10-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/10/1122 |
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| author | Simone Kaar Daniel Krizan Reinhold Schneider Coline Béal Christof Sommitsch |
| author_facet | Simone Kaar Daniel Krizan Reinhold Schneider Coline Béal Christof Sommitsch |
| author_sort | Simone Kaar |
| collection | DOAJ |
| description | The present work focuses on the investigation of both microstructure and resulting mechanical properties of different lean medium Mn Quenching and Partitioning (Q&P) steels with 0.2 wt.% C, 1.5 wt.% Si, and 3−4 wt.% Mn. By means of dilatometry, a significant influence of the Mn-content on their transformation behavior was observed. Light optical and scanning electron microscopy (LOM, SEM) was used to characterize the microstructure consisting of tempered martensite (α’’), retained austenite (RA), partially bainitic ferrite (α<sub>B</sub>), and final martensite (α’<sub>final</sub>) formed during final cooling to room temperature (RT). Using the saturation magnetization measurements (SMM), a beneficial impact of the increasing Mn-content on the volume fraction of RA could be found. This remarkably determined the mechanical properties of the investigated steels, since the larger amount of RA with its lower chemical stabilization against the strain-induced martensite transformation (SIMT) highly influenced their overall stress-strain behavior. With increasing Mn-content the ultimate tensile strength (UTS) rose without considerable deterioration in total elongation (TE), leading to an enhanced combination of strength and ductility with UTS × TE exceeding 22,500 MPa%. However, for the steel grades containing an elevated Mn-content, a narrower process window was observed due to the tendency to form α’<sub>final</sub>. |
| first_indexed | 2024-12-22T10:05:30Z |
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| id | doaj.art-c13b4d00e98a492daad109f33855cacc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T10:05:30Z |
| publishDate | 2019-10-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-c13b4d00e98a492daad109f33855cacc2022-12-21T18:29:58ZengMDPI AGMetals2075-47012019-10-01910112210.3390/met9101122met9101122Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning ProcessSimone Kaar0Daniel Krizan1Reinhold Schneider2Coline Béal3Christof Sommitsch4Research and Development, University of Applied Sciences Upper Austria, Wels 4600, AustriaResearch and Development Department, Business Unit Coil, voestalpine Stahl GmbH, Linz 4020, AustriaResearch and Development, University of Applied Sciences Upper Austria, Wels 4600, AustriaInstitute of Materials Science, Joining and Forming, Graz University of Technology, Graz 8010, AustriaInstitute of Materials Science, Joining and Forming, Graz University of Technology, Graz 8010, AustriaThe present work focuses on the investigation of both microstructure and resulting mechanical properties of different lean medium Mn Quenching and Partitioning (Q&P) steels with 0.2 wt.% C, 1.5 wt.% Si, and 3−4 wt.% Mn. By means of dilatometry, a significant influence of the Mn-content on their transformation behavior was observed. Light optical and scanning electron microscopy (LOM, SEM) was used to characterize the microstructure consisting of tempered martensite (α’’), retained austenite (RA), partially bainitic ferrite (α<sub>B</sub>), and final martensite (α’<sub>final</sub>) formed during final cooling to room temperature (RT). Using the saturation magnetization measurements (SMM), a beneficial impact of the increasing Mn-content on the volume fraction of RA could be found. This remarkably determined the mechanical properties of the investigated steels, since the larger amount of RA with its lower chemical stabilization against the strain-induced martensite transformation (SIMT) highly influenced their overall stress-strain behavior. With increasing Mn-content the ultimate tensile strength (UTS) rose without considerable deterioration in total elongation (TE), leading to an enhanced combination of strength and ductility with UTS × TE exceeding 22,500 MPa%. However, for the steel grades containing an elevated Mn-content, a narrower process window was observed due to the tendency to form α’<sub>final</sub>.https://www.mdpi.com/2075-4701/9/10/1122lean medium mn q&p steelstress-strain behaviormechanical propertiesretained austenite stability |
| spellingShingle | Simone Kaar Daniel Krizan Reinhold Schneider Coline Béal Christof Sommitsch Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process Metals lean medium mn q& p steel stress-strain behavior mechanical properties retained austenite stability |
| title | Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process |
| title_full | Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process |
| title_fullStr | Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process |
| title_full_unstemmed | Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process |
| title_short | Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process |
| title_sort | effect of manganese on the structure properties relationship of cold rolled ahss treated by a quenching and partitioning process |
| topic | lean medium mn q& p steel stress-strain behavior mechanical properties retained austenite stability |
| url | https://www.mdpi.com/2075-4701/9/10/1122 |
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