Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons
Previous experiments showed a specific distribution of Al, La, and Ca on the section of complex (Mn,X)S compounds, found as major nucleation sites for graphite flakes in low-S cast irons (< 0.03%S), and a possible contribution of La to improve their capacity to nucleate graphite, avoiding carbide...
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| Format: | Article |
| Language: | English |
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Technical Faculty, Bor
2020-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000020S.pdf |
| _version_ | 1818676792149409792 |
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| author | Stefan E. Chisamera M. Riposan I. |
| author_facet | Stefan E. Chisamera M. Riposan I. |
| author_sort | Stefan E. |
| collection | DOAJ |
| description | Previous experiments showed a specific distribution of Al, La, and Ca on the section of complex (Mn,X)S compounds, found as major nucleation sites for graphite flakes in low-S cast irons (< 0.03%S), and a possible contribution of La to improve their capacity to nucleate graphite, avoiding carbides formation. In the present work, standard thermal [cooling curves] investigations were undertaken to explore Ca and La-Ca bearing FeSi alloys inoculation effects [10 measurements for each inoculant], in 3.7 – 3.8%CE and optimum S and Mn relationship [0.046 – 0.056%S, (%Mn) x (%S) = 0.024 – 0.029]. Representative temperatures on the cooling curves and under-cooling degrees referring to the meta-stable eutectic temperatures were determined and correlated with the chill [carbides/graphite formation sensitiveness], in different solidification conditions [cooling modulus, wedge shape castings, resin sand mould]. Supplementary addition of La to Cabearing inoculants had limited, but specific benefits in these cast irons: lower eutectic recalescence and maximum recalescence rate, higher GRF1 and lower GRF2 graphitizing factors, and lower value of the first derivative at the end of solidification. Consequently, it resulted in a premise for lower shrinkage sensitiveness and lower chill (carbides) sensitiveness, especially at the highest solidification cooling rate (thin wall castings). |
| first_indexed | 2024-12-17T08:49:06Z |
| format | Article |
| id | doaj.art-d84d45ebe0484a28884ca5a70173b418 |
| institution | Directory Open Access Journal |
| issn | 1450-5339 2217-7175 |
| language | English |
| last_indexed | 2024-12-17T08:49:06Z |
| publishDate | 2020-01-01 |
| publisher | Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj.art-d84d45ebe0484a28884ca5a70173b4182022-12-21T21:56:08ZengTechnical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752020-01-0156338939810.2298/JMMB200108020S1450-53392000020SChill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast ironsStefan E.0Chisamera M.1Riposan I.2Politehnica University of Bucharest, Materials Science and Engineering Faculty, Bucharest, RomaniaPolitehnica University of Bucharest, Materials Science and Engineering Faculty, Bucharest, RomaniaPolitehnica University of Bucharest, Materials Science and Engineering Faculty, Bucharest, RomaniaPrevious experiments showed a specific distribution of Al, La, and Ca on the section of complex (Mn,X)S compounds, found as major nucleation sites for graphite flakes in low-S cast irons (< 0.03%S), and a possible contribution of La to improve their capacity to nucleate graphite, avoiding carbides formation. In the present work, standard thermal [cooling curves] investigations were undertaken to explore Ca and La-Ca bearing FeSi alloys inoculation effects [10 measurements for each inoculant], in 3.7 – 3.8%CE and optimum S and Mn relationship [0.046 – 0.056%S, (%Mn) x (%S) = 0.024 – 0.029]. Representative temperatures on the cooling curves and under-cooling degrees referring to the meta-stable eutectic temperatures were determined and correlated with the chill [carbides/graphite formation sensitiveness], in different solidification conditions [cooling modulus, wedge shape castings, resin sand mould]. Supplementary addition of La to Cabearing inoculants had limited, but specific benefits in these cast irons: lower eutectic recalescence and maximum recalescence rate, higher GRF1 and lower GRF2 graphitizing factors, and lower value of the first derivative at the end of solidification. Consequently, it resulted in a premise for lower shrinkage sensitiveness and lower chill (carbides) sensitiveness, especially at the highest solidification cooling rate (thin wall castings).http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000020S.pdfsolidificationthermal analysiscooling curve analysisgrey cast ironcooling modulusinoculationcalacarbidesgraphite |
| spellingShingle | Stefan E. Chisamera M. Riposan I. Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons Journal of Mining and Metallurgy. Section B: Metallurgy solidification thermal analysis cooling curve analysis grey cast iron cooling modulus inoculation ca la carbides graphite |
| title | Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons |
| title_full | Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons |
| title_fullStr | Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons |
| title_full_unstemmed | Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons |
| title_short | Chill sensitiveness and thermal analysis parameters relationship in hypo-eutectic, Ca and Ca-La inoculated commercial grey cast irons |
| title_sort | chill sensitiveness and thermal analysis parameters relationship in hypo eutectic ca and ca la inoculated commercial grey cast irons |
| topic | solidification thermal analysis cooling curve analysis grey cast iron cooling modulus inoculation ca la carbides graphite |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000020S.pdf |
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