Ultrahigh-strength steel wire for electric arc additive manufacturing and preparation method

Abstract

The invention discloses an ultrahigh-strength steel wire for electric arc additive manufacturing. The ultrahigh-strength steel wire is characterized by comprising the following components of, in percentage by mass, less than or equal to 0.03% of C, less than or equal to 0.5% of Si, 3.0%-6.0% of Mo, 16.0%-20.0% of Ni, 0.5%-1.8% of Ti, 0.05%-0.20% of Al, less than or equal to 0.003% of P, less thanor equal to 0.003% of S, less than or equal to 5 ppm of H, less than or equal to 0.002% of N, less than or equal to 0.003% of O, and the balance Fe. According to the ultrahigh-strength steel wire forthe electric arc additive manufacturing and the preparation method, the ultrahigh-strength steel wire prepared is scientific and reasonable in component design, the tensile strength can reach 1330 MPaor above, the yield strength can reach 1250 MPa or above, and meanwhile the ductility can be kept at 8% or above after heat treatment is conducted on an accumulation body manufactured through the ultrahigh-strength steel wire in an electric arc additive mode.

Description

Technical field[0001]The invention relates to the field of materials for arc additive manufacturing, in particular to an ultra-high-strength steel wire material for arc additive manufacturing and a preparation method.Background technique[0002]Ultra-high-strength steel is widely used in aerospace, rail transit, ships, weapons and molds with its excellent strength and toughness. With the development of large-scale mechanical equipment and integration of work and structure, the structure of ultra-high-strength steel components has gradually become more complicated and diversified. However, traditional processing techniques such as casting, forging and welding are often difficult to meet the needs of complex and diversified manufacturing of large ultra-high-strength steel components. In recent years, the development of arc additive manufacturing technology has provided a new method for the manufacture of large and complex ultra-high-strength steel components. The ultra-high-strength ste...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the ultra-high-strength steel arc additive manufacturing technology: First, there is a shortage of ultra-high-strength steel wires for arc additive manufacturing. At present, commercial ultra-high-strength steel welding wires are mainly used to replace them. Wire materials are expensive; secondly, the microstructure of ultra-high-strength steel arc additive manufacturing is coarse, and there is segregation of alloy elements such as nickel between dendrites. During the heat treatment process, the segregated area will form reversed austenite, which is prone to cracks under external load , leading to lower performance of additively manufactured components than forgings. At present, the non-melting electrode arc additive manufacturing method is mainly used to reduce the degree of microstructure coarsening and segregation, resulting in low additive manufacturing rate.

The above problems seriously restrict the application and promotion of ultra-high-strength steel arc additive manufacturing technology

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