Silicon carbide reinforced synthetic vermicular graphite cast iron material and preparation method thereof

Abstract

The invention belongs to the technical field of metal material casting, and discloses a silicon carbide reinforced synthetic vermicular graphite cast iron material and a preparation method thereof. The vermicular graphite cast iron comprises the following components in percentage by mass: 3.0-4.0% of C, 1.0-2.0% of Si, 0.0-0.2% of Mn, Plt, 0.1-0.2% of Cr, 0.1-0.2% of Mo, 0.1-0.2% of Mo, 0.1-0.2 0.03%, Slt; the alloy comprises the following components in percentage by weight: 0.03% of Fe, 0.00-0.05% of Ti, 0.0-1.2% of Cu, 0.006-0.03% of Mg and the balance of Fe and inevitable impurities. The preparation method comprises the five steps of silicon carbide pretreatment, burdening, smelting, tapping vermicular inoculation treatment and pouring. According to the method, 3%-9% of pretreated micron-sized silicon carbide and graphite are added for recarburization to control the quality of molten iron of a synthesized vermicular graphite cast iron solution, the molten iron is purified, the graphite form is improved, a matrix structure is refined and strengthened, and on the premise that the comprehensive strength of the vermicular graphite cast iron is improved, the usage amount of raw material pig iron is reduced, the production cost is reduced, and the economic benefit is improved; in addition, the silicon carbide reinforced synthetic vermicular graphite cast iron can be popularized to preparation of all cast parts, and the yield is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal material casting, and relates to a silicon carbide reinforced synthetic vermicular cast iron material and a preparation method thereof. Background technique [0002] With the continuous improvement of the power density of modern diesel engines for new vehicles, the mechanical and thermal loads of key components such as engine blocks and cylinder heads have increased. Therefore, their strength, stiffness, heat resistance, fatigue resistance and process Performance and so on put forward more stringent requirements. Conventional gray cast iron is difficult to meet the service requirements, and often fails before reaching the service life, which leads to frequent accidents, seriously affects people's safe travel, and poses a great threat to people's life safety. [0003] Compacted graphite iron is a relatively new material in the cast iron family. Its tensile strength is comparable to malleable or duct...

AI Technical Summary

Problems solved by technology

However, the raw materials of traditional casting use a large amount of pig iron, and there are strict requirements on the use of pig iron, high-quality, low-sulfur and low-phosphorus, but my country's pig iron can no longer meet the needs of high-performance cast iron solution preparation, and it needs to be imported from some countries in America and Africa , the price is high and controlled by others, it is easily affected by the international environment, and the fluctuation of pig iron quality leads to low product yield and many scrap products.

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