High-strength spheroidal graphite cast iron forging method

Abstract

The invention discloses a high-strength spheroidal graphite cast iron forging method. The high-strength spheroidal graphite cast iron forging method comprises the following steps that a spheroidal graphite cast iron test specimen is subjected to heat preservation for 30 min or above at the temperature of 550 DEG C-750 DEG C, then forging forming is conducted, the initial forging temperature is 550 DEG C-750 DEG C, the final forging temperature is not lower than 500 DEG C, and the spheroidal graphite cast iron test specimen is naturally cooled or water-cooled in the air after being forged; the spheroidal graphite cast iron test specimen is cylindrical or square, and the heat preservation time of the spheroidal graphite cast iron test specimen is prolonged along with increasing of the size of the test specimen; the forging total deformation quantity of the test specimen is controlled to be 60%-70%; double-sided alternating forging is conducted on the test specimen with a certain size; and the strain rate of forging forming is controlled to be 0.0001-0.1 / s. According to the high-strength spheroidal graphite cast iron forging method, internal grains of spheroidal graphite cast iron can be further refined; internal defects of the spheroidal graphite cast iron are overcome; the strength, the toughness and the abrasion resistance of the spheroidal graphite cast iron are improved; the product quality and the mechanical property are improved; metal materials and the cutting machining man-hour can be saved; resource consumption is reduced; and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of alloy processing, in particular to a high-strength nodular cast iron forging method. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. It obtains nodular graphite through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thereby obtaining a carbon Steel has high strength, good wear resistance, wear reduction, corrosion resistance and oxidation resistance, and is widely used in casting parts with complex stress, high strength, toughness and wear resistance, such as engine crankshafts, etc. , It can even replace steel in some fields. . [0003] At present, the ductile iron products produced by foundries have casting defects such as poor spheroidization, shrinkage porosity and shrinkage cavities, and slag inclusions. The loss rate of waste products is high, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the ductile iron products produced by foundries have casting defects such as poor spheroidization, shrinkage porosity and shrinkage cavities, and slag inclusions. The loss rate of waste products is high, which not only reduces the quality and use quality of ductile iron products, but also causes waste of resources and reduces economic benefits.

Currently these casting issues are not well resolved

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