Research of Properties and Microstructure on High-Strength Casting of Turbo-Charger

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Combining with productive practice, production of intermediate castings in high-strength turbochargers under the condition of intermediate frequency furnaces is analysed in this paper. By adopting measures of compound inoculation and increasing Sulfur, 95% type A graphite and high-strength intermediate castings whose tensile strength is 300 MPa are acquired. Furthermore, moderate amounts of S and Mn as well as CE values are determined according to test results. As for thin-wall gray cast iron with high strength and complicate structure, when w S is low and w C is high, castings with good graphite form can be produced. But it is not stable and the strength is low. Adding inoculants like Calballoy and Si-Ca-Ba can significantly improve the graphite form on the edge of thin-walls. When w C is stabilized at about 4.1, stable and continuous production of high strength gray cast iron with good graphite form can be guaranteed by adding sulfur and controlling the amount of Mn. The proportion of A type graphite and that of pearlite are both more than 90%.When high-strength gray cast iron is produced in intermediate frequency furnaces, w S should be controlled between 0.1% and 0.12% and w Mn should be controlled between 0.5% and 0.55%.

Info:

Periodical:

Advanced Materials Research (Volumes 328-330)

Edited by:

Liangchi Zhang, Chunliang Zhang and Zichen Chen

Pages:

1292-1296

DOI:

10.4028/www.scientific.net/AMR.328-330.1292

Citation:

A. X. Pan "Research of Properties and Microstructure on High-Strength Casting of Turbo-Charger", Advanced Materials Research, Vols. 328-330, pp. 1292-1296, 2011

Online since:

September 2011

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$35.00

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