Structure and properties forming in ductile iron during isothermal hardening using ultrasound
The paper considers the possibility of intensifying isothermal holding processes during quenching of high-strength cast irons by using an external source of physical impact in the form of ultrasonic waves. For experimental evaluation of this effect in the laboratory of MiAM of the Physical-Technical...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Belarusian National Technical University
2020-12-01
|
| Series: | Litʹë i Metallurgiâ |
| Subjects: | |
| Online Access: | https://lim.bntu.by/jour/article/view/3264 |
| _version_ | 1811182800695459840 |
|---|---|
| author | M. S. Kovalko A. T. Volochko A. V. Ziziko V. V. Rubanik |
| author_facet | M. S. Kovalko A. T. Volochko A. V. Ziziko V. V. Rubanik |
| author_sort | M. S. Kovalko |
| collection | DOAJ |
| description | The paper considers the possibility of intensifying isothermal holding processes during quenching of high-strength cast irons by using an external source of physical impact in the form of ultrasonic waves. For experimental evaluation of this effect in the laboratory of MiAM of the Physical-Technical Institute of the National Academy of Sciences of Belarus, prototypes of highstrength cast irons were cast in an ISV 0.004 crucible induction furnace. A mixture of NaNO2 and KNO3 salts in a 1:1 ratio was used as a liquid cooling medium during quenching. Ultrasonic treatment of the salt melt during the cooling of the samples was carried out using an UZG-20–15 generator in cooperation with the ITA of NAS of Belarus. The mechanical properties and structure of the treated cast irons were determined both in the cast state and after isothermal quenching.To study the effect of ultrasonic treatment of the quenching bath on the formation of the structure and properties of highstrength cast irons during isothermal quenching, a number of comparative experiments were carried out, consisting in cooling the samples from 910 °C to 350 °C with and without the use of dynamic waves to the bath. With the help of metallographic analysis, measurements of hardness and friction coefficient, the beneficial effect of ultrasonic treatment of the cooling medium on the structure and properties is shown, which is reflected in an increase in the uniformity of the distribution of hardness over the cross section of cast iron and in its wear resistance, as well as a reduction in the isothermal holding time by up to two times. |
| first_indexed | 2024-04-11T09:37:42Z |
| format | Article |
| id | doaj.art-655c62661df643e38b1a4710679b6ca4 |
| institution | Directory Open Access Journal |
| issn | 1683-6065 2414-0406 |
| language | English |
| last_indexed | 2024-04-11T09:37:42Z |
| publishDate | 2020-12-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Litʹë i Metallurgiâ |
| spelling | doaj.art-655c62661df643e38b1a4710679b6ca42022-12-22T04:31:32ZengBelarusian National Technical UniversityLitʹë i Metallurgiâ1683-60652414-04062020-12-010411812410.21122/1683-6065-2020-4-118-1243160Structure and properties forming in ductile iron during isothermal hardening using ultrasoundM. S. Kovalko0A. T. Volochko1A. V. Ziziko2V. V. Rubanik3Physical-Technical Institute of the National Academy of Sciences of BelarusPhysical-Technical Institute of the National Academy of Sciences of BelarusPhysical-Technical Institute of the National Academy of Sciences of BelarusInstitute of Technical Acoustics of the National Academy of Sciences of BelarusThe paper considers the possibility of intensifying isothermal holding processes during quenching of high-strength cast irons by using an external source of physical impact in the form of ultrasonic waves. For experimental evaluation of this effect in the laboratory of MiAM of the Physical-Technical Institute of the National Academy of Sciences of Belarus, prototypes of highstrength cast irons were cast in an ISV 0.004 crucible induction furnace. A mixture of NaNO2 and KNO3 salts in a 1:1 ratio was used as a liquid cooling medium during quenching. Ultrasonic treatment of the salt melt during the cooling of the samples was carried out using an UZG-20–15 generator in cooperation with the ITA of NAS of Belarus. The mechanical properties and structure of the treated cast irons were determined both in the cast state and after isothermal quenching.To study the effect of ultrasonic treatment of the quenching bath on the formation of the structure and properties of highstrength cast irons during isothermal quenching, a number of comparative experiments were carried out, consisting in cooling the samples from 910 °C to 350 °C with and without the use of dynamic waves to the bath. With the help of metallographic analysis, measurements of hardness and friction coefficient, the beneficial effect of ultrasonic treatment of the cooling medium on the structure and properties is shown, which is reflected in an increase in the uniformity of the distribution of hardness over the cross section of cast iron and in its wear resistance, as well as a reduction in the isothermal holding time by up to two times.https://lim.bntu.by/jour/article/view/3264ductile ironultrasoundisothermal hardeningausferritetransformationfriction coefficient |
| spellingShingle | M. S. Kovalko A. T. Volochko A. V. Ziziko V. V. Rubanik Structure and properties forming in ductile iron during isothermal hardening using ultrasound Litʹë i Metallurgiâ ductile iron ultrasound isothermal hardening ausferrite transformation friction coefficient |
| title | Structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| title_full | Structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| title_fullStr | Structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| title_full_unstemmed | Structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| title_short | Structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| title_sort | structure and properties forming in ductile iron during isothermal hardening using ultrasound |
| topic | ductile iron ultrasound isothermal hardening ausferrite transformation friction coefficient |
| url | https://lim.bntu.by/jour/article/view/3264 |
| work_keys_str_mv | AT mskovalko structureandpropertiesforminginductileironduringisothermalhardeningusingultrasound AT atvolochko structureandpropertiesforminginductileironduringisothermalhardeningusingultrasound AT avziziko structureandpropertiesforminginductileironduringisothermalhardeningusingultrasound AT vvrubanik structureandpropertiesforminginductileironduringisothermalhardeningusingultrasound |