A kind of electric fusion forming ultra-low carbon ultra-fine grain alloy steel material

Abstract

The invention aims to provide an ultra-low carbon and ultra-fine grain steel material which can be efficiently prepared and has the advantages of low cost and high mechanical properties. The material is prepared by using the following electrofusion forming method: an electrofusion head and a substrate are connected to two electrodes of a power source; during a forming process, a raw material wire is conveyed to the surface of the substrate via a conveying mechanism and the electrofusion head; a granular auxiliary material is stacked at the forming position; an electric arc is generated between the raw material wire and the substrate to melt part of the auxiliary material stacked at the forming position, and a molten slag bath is formed; a current flows through the raw material wire and the auxiliary material molten slag bath to generate resistance heat and electroslag heat, so that the raw material wire is fused by a high-energy heat source composed of electric arc heat, resistance heat and electro slag heat, and a local molten bath is formed on the surface of the substrate; the raw material wire and the auxiliary material are continuously conveyed; and by controlling the relative movement of the electrofusion head and the substrate and the fast cooling of components of the substrate, the molten bath is quickly cooled and chilled so as to be solidified and stacked on the substrate layer by layer, and finally a material with a C content of 0.04-0.18% and a grain size of 7-10 scales is obtained

Description

technical field [0001] The invention relates to an ultra-low-carbon ultra-fine grain high-strength steel material. Background technique [0002] At present, in order to adapt to the increasingly large-scale, complex and high-performance parameters of heavy equipment such as nuclear power, thermal power, petrochemical, and metallurgy, the material size requirements for key ultra-low carbon ultra-fine-grained high-strength steel materials are increasing, and the mechanical properties In particular, the comprehensive performance requirements of strength and toughness are getting higher and higher. [0003] For the low-alloy high-strength steel, heat-resistant steel, and rotor steel materials widely used in industry at present, such as Mn-Mo series, Mn-Mo-Ni series, Cr-Mo series, Cr-Mo-V series, etc., in order to meet the requirements of the material Yield strength and tensile strength performance requirements, the carbon element contained in the material generally takes the up...

AI Technical Summary

Problems solved by technology

Although this method is widely used in industrial production, the final grain measurement results are generally only about 5-7 grades. Further refinement of grains in production will encounter a large process bottleneck and high cost

For heavy workpiece materials, due to the large cross-sectional size, during heat treatment, the core and the surface will undergo different heat treatment speeds during the heating and cooling process, which is prone to uneven material phase structure, and even stress cracking, which greatly affects the material. mechanical properties

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