A kind of surface modification method of cast iron

Abstract

A method for surface modification of cast iron, which uses high-energy superposition to modify the surface of cast iron materials, specifically a new type of surface modification technology for cast iron materials using electric explosion, gas explosion, and plasma energy superposition. This technology has the characteristics of one, two or more of the three surface modification technologies of plasma surface modification, gas explosion and electric explosion, and can be processed in an atmospheric environment with low cost and high processing efficiency. A reinforced modified layer with a thickness of 70‑150 μm is formed on the surface of the parts, which can improve the wear resistance, corrosion resistance and service life of cast iron parts by 1‑6 times. The invention is suitable for surface modification treatment of gray cast iron, malleable cast iron, nodular cast iron, vermicular graphite cast iron and alloy cast iron parts, and can be widely used in the fields of machinery industry, aviation manufacturing and the like.

Description

technical field [0001] The invention belongs to the field of metal material processing, and relates to a surface modification method for gray cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron. Background technique [0002] Cast iron is an iron-based alloy with a carbon content greater than 2.11% and elements such as Si, Mn, S, and P. Cast iron has been widely used in industry because of its good castability, machinability, vibration damping and low production cost. According to the shape of graphite in cast iron (flaky, flocculent, spherical, worm-like), cast iron can be divided into gray cast iron, malleable cast iron, nodular cast iron and vermicular graphite cast iron. In addition, alloy cast iron can be obtained by adding appropriate amount of other alloying elements to cast iron. [0003] Gray cast iron is mainly used in pressure and load-bearing parts such as cylinders in vehicles, cylinder liners, and bed of machine tools. ...

AI Technical Summary

Problems solved by technology

However, there are some deficiencies in the existing methods: (1) The electron beam processing environment has strict requirements and needs to be processed under vacuum conditions.

(2) The area processed by the laser beam is very small each time, and the energy is too concentrated to cause large residual stress

(3) The energy density of ion beam processing is low

(4) The induction heating treatment equipment is complicated, and it is difficult to guarantee the quality of workpieces with complex shapes

(5) Surface nitriding and surface boronizing have problems such as complex equipment, poor furnace temperature uniformity and high cost

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