Surface modification method of cast iron

Abstract

The invention relates to a surface modification method of cast iron, particularly a novel cast iron material surface modification technique by using electric explosion, gaseous detonation and plasma energy superposition, which performs modification treatment on the cast iron material surface by using high energy superposition. The method has the characteristics of one or two or more of the three surface modification techniques (plasma surface modification, gaseous detonation and electric explosion), can implement treatment in an atmospheric environment, has the advantages of low cost and high treatment efficiency, can form a 70-150-mu m-thick enhanced modified layer on the surface of the cast iron part, and can enhance the wearability, corrosion resistance and service life of the cast iron part by 1-6 times. The method is suitable for surface modification treatment of gray cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron parts, and can be widely used in the fields of mechanical 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 different graphite forms 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 m...

AI Technical Summary

Problems solved by technology

However, there are some shortcomings 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, resulting in large residual stress

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

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

(5) There are problems such as complex equipment, poor furnace temperature uniformity and high cost in surface nitriding and surface boronizing

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