Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling
Cold-rolled silicon steel strip products are widely used as the main soft magnetic components in cores of electrical motors, generators, and transformers. In the case of rotating electrical machines, the so-called non-oriented electro-technical steels are normally applied. They are characterized by...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-08-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/13/8/1415 |
| _version_ | 1797583808407535616 |
|---|---|
| author | František Kováč Ivan Petryshynets Róbert Kočiško Patrik Petroušek Ladislav Falat |
| author_facet | František Kováč Ivan Petryshynets Róbert Kočiško Patrik Petroušek Ladislav Falat |
| author_sort | František Kováč |
| collection | DOAJ |
| description | Cold-rolled silicon steel strip products are widely used as the main soft magnetic components in cores of electrical motors, generators, and transformers. In the case of rotating electrical machines, the so-called non-oriented electro-technical steels are normally applied. They are characterized by a similar behaviour to the induced magnetic field found in all sheet plane directions. The kind of soft magnetic alloys that defined herein not only possess an isotropy of electromagnetic properties, but also high mechanical strength; such alloys are called high-strength electro-technical (HSET) steels. These commercially produced HSET steels contain a high silicon content in the range of 3–4 wt.%. However, if the silicon content exceeds 3%, the machinability of Fe–Si alloys is dramatically reduced and they become much more brittle as a consequence. According to this, regular hot band brittle damage occurs during cold deformation at a high-speed tandem rolling mill. In accordance with these reasons, the production of thin high-strength silicon steel grades using the traditional methods of cold rolling deformation is extremely problematic and it is characterised by a high degree of steel sheet mechanical damage. In this scientific work, the effect of preheating hot-rolled strips on their mechanical workability improvement during tandem cold rolling was investigated. The results of this study indicate that the cold rolling of hot bands at elevated temperatures increases their resistance to brittle failure and mechanical plasticity. Moreover, the mathematical simulation clearly demonstrates that residual stress is distributed relatively homogeneously across the thickness of samples, which were cold rolled at 100 °C in contrast to the same ones deformed at room temperature. |
| first_indexed | 2024-03-10T23:44:14Z |
| format | Article |
| id | doaj.art-0972a876f64c464a8388faca896bd6ed |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T23:44:14Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-0972a876f64c464a8388faca896bd6ed2023-11-19T02:10:52ZengMDPI AGMetals2075-47012023-08-01138141510.3390/met13081415Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold RollingFrantišek Kováč0Ivan Petryshynets1Róbert Kočiško2Patrik Petroušek3Ladislav Falat4Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, SlovakiaInstitute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, SlovakiaDepartment of Plastic Deformation and Simulation Processes, Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Vysokoskolska 4, 04200 Kosice, SlovakiaDepartment of Plastic Deformation and Simulation Processes, Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Vysokoskolska 4, 04200 Kosice, SlovakiaInstitute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, SlovakiaCold-rolled silicon steel strip products are widely used as the main soft magnetic components in cores of electrical motors, generators, and transformers. In the case of rotating electrical machines, the so-called non-oriented electro-technical steels are normally applied. They are characterized by a similar behaviour to the induced magnetic field found in all sheet plane directions. The kind of soft magnetic alloys that defined herein not only possess an isotropy of electromagnetic properties, but also high mechanical strength; such alloys are called high-strength electro-technical (HSET) steels. These commercially produced HSET steels contain a high silicon content in the range of 3–4 wt.%. However, if the silicon content exceeds 3%, the machinability of Fe–Si alloys is dramatically reduced and they become much more brittle as a consequence. According to this, regular hot band brittle damage occurs during cold deformation at a high-speed tandem rolling mill. In accordance with these reasons, the production of thin high-strength silicon steel grades using the traditional methods of cold rolling deformation is extremely problematic and it is characterised by a high degree of steel sheet mechanical damage. In this scientific work, the effect of preheating hot-rolled strips on their mechanical workability improvement during tandem cold rolling was investigated. The results of this study indicate that the cold rolling of hot bands at elevated temperatures increases their resistance to brittle failure and mechanical plasticity. Moreover, the mathematical simulation clearly demonstrates that residual stress is distributed relatively homogeneously across the thickness of samples, which were cold rolled at 100 °C in contrast to the same ones deformed at room temperature.https://www.mdpi.com/2075-4701/13/8/1415high-strength electro-technical steelsmicrostructurecold rollingbrittle damages5-stand tandem cold rolling mill |
| spellingShingle | František Kováč Ivan Petryshynets Róbert Kočiško Patrik Petroušek Ladislav Falat Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling Metals high-strength electro-technical steels microstructure cold rolling brittle damages 5-stand tandem cold rolling mill |
| title | Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling |
| title_full | Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling |
| title_fullStr | Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling |
| title_full_unstemmed | Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling |
| title_short | Effect of Preheating on the Mechanical Workability Improvement of High-Strength Electrical Steels during Tandem Cold Rolling |
| title_sort | effect of preheating on the mechanical workability improvement of high strength electrical steels during tandem cold rolling |
| topic | high-strength electro-technical steels microstructure cold rolling brittle damages 5-stand tandem cold rolling mill |
| url | https://www.mdpi.com/2075-4701/13/8/1415 |
| work_keys_str_mv | AT frantisekkovac effectofpreheatingonthemechanicalworkabilityimprovementofhighstrengthelectricalsteelsduringtandemcoldrolling AT ivanpetryshynets effectofpreheatingonthemechanicalworkabilityimprovementofhighstrengthelectricalsteelsduringtandemcoldrolling AT robertkocisko effectofpreheatingonthemechanicalworkabilityimprovementofhighstrengthelectricalsteelsduringtandemcoldrolling AT patrikpetrousek effectofpreheatingonthemechanicalworkabilityimprovementofhighstrengthelectricalsteelsduringtandemcoldrolling AT ladislavfalat effectofpreheatingonthemechanicalworkabilityimprovementofhighstrengthelectricalsteelsduringtandemcoldrolling |