Optimization of the SiC Pretreatment Process for Thick Heavy Section Heat-resistant Si-Mo Ductile Iron
To solve the problem of nodularization and graphite degeneration of thick section heat-resistant Si-Mo ductile iron, standard Y-type test blocks with different wall thickness were poured, and the effects of the SiC pretreatment process on the microstructure and mechanical properties of thick heavy s...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Harbin University of Science and Technology Publications
2022-12-01
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| Series: | Journal of Harbin University of Science and Technology |
| Subjects: | |
| Online Access: | https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=2159 |
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| Summary: | To solve the problem of nodularization and graphite degeneration of thick section heat-resistant Si-Mo ductile iron, standard Y-type test blocks with different wall thickness were poured, and the effects of the SiC pretreatment process on the microstructure and mechanical properties of thick heavy section heat-resistant Si-Mo ductile iron were studied by metallographic microscopy, scanning electron microscopy and electronic universal tensile testing machines. The results show that after furnace pretreatment by SiC, the spheroidization percentage on the edge positions of the specimens with wall thicknesses of 25mm and 75mm reach more than 90%, and the spheroidization level is grade 2. In the middle position of the specimen with a wall thickness of 75mm, the spheroidization grade also reached grade 3, and the spheroidization percentage was 80-90%; the tensile strength of the sample on the edge of the sample with 75mm wall thickness was 526MPa, the elongation was 14.3%, and in the middle position, which was 515MPa and 13%, respectively. The tensile strength of the specimen with a 25mm wall thickness is 550MPa, and the elongation is 18.5%. With increasing tensile temperature, the tensile strength of the specimen with a 75 mm wall thickness gradually decreases. At 350℃, the tensile strength of the sample is as high as 490MPa, and at 500℃, the tensile strength can still reach 267MPa. |
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| ISSN: | 1007-2683 |