Double-rear earth doping modification abrasion-resistant alloy cast iron and preparation method thereof

Abstract

The invention provides a double-rear earth doping modification abrasion-resistant alloy cast iron and a preparation method thereof. A mixture is prepared, wherein the mixture comprises the following components in percentage by weight: 3.1-3.2% of C, 0.9% of Si, 0.6% of Mn, 1.0-1.5% of Cu, 0.2-0.4% of P, 0.02-0.04% of B, 0.0005% of S and Fe; in a smelting furnace, the prepared raw material is smelted at 1500-1550 DEG C to obtain molten iron; 0.01-0.4% of La and 0.01-0.7% of Ce are added in before the raw material is added into a casting ladle, and then the mixture is added into the casting ladle for ladle inoculation, wherein the inoculation time is 10+ / -2 min, and the tapping temperature of the molten iron is 1400-1450 DEG C; and casting is performed to obtain the double-rear earth doping modification abrasion-resistant alloy cast iron. The double-rear earth doping modification abrasion-resistant alloy cast iron is low in cost and high in abrasion-resistance, and is applicable to manufacture of cylinder jackets, piston rings and other friction parts of automobiles, ships and the like; and the process is simple.

Description

technical field [0001] The invention relates to a cast iron, in particular to a wear-resistant alloy cast iron. The invention also relates to a preparation method of wear-resistant alloy cast iron. Background technique [0002] Cast iron is a multi-element iron-based alloy mainly composed of Fe-C-Si, and its chemical composition (mass fraction) ranges roughly from C: 2.0% to 4.0%, Si: 1.0% to 3.0%, Mn: 0.1% to 1.5%, P: 0.05% to 1.0%, S: 0.02% to 0.25%. On the basis of this composition, alloy cast iron with different properties can be obtained by adding other metal elements. [0003] In the process of iron and steel casting, rare earth elements can be added to molten iron as nodularizers, refining agents and desulfurizers, which can significantly optimize the casting performance of cast iron, improve surface quality, reduce casting surface cracks, pores, shrinkage cavities, and reduce segregation . And obtained vermicular graphite cast iron with good wear resistance, whic...

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Problems solved by technology

However, the overall domestic high-power diesel engine manufacturing enterprises have not studied the basic technology of casting technology deeply enough, and have failed to master the control laws of molding, smelting, inoculation, pouring, etc., and the level of cylinder liner casting technology is relatively low, resulting in the geometric size and A series of disadvantages such as large machining allowance, poor surface quality, low dimensional accuracy, local casting defects, uneven structure, and serious segregation

[0006] In related fields, it can be seen that single rare earth element lanthanum or cerium is doped in the cast iron process, but its wear resistance is not discussed, and the comprehensive performance index is not clearly indicated

There is no report on the systematic research on the influence of double rare earth mixed doping and the specific addition amount of rare earth elements on the structure and properties of alloy cast iron.

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