Method for manufacturing non-carbide segregation high-alloy ledeburite steel by phase transition resistance diffusion welding

Abstract

The invention discloses a phase change resistance diffusion welding method to manufacture none carbide segregation high alloy ledeburitic steel. The invention includes the following steps: first, casting the melting high alloy ledeburitic steel into flat section ingot with over six of width to height ratio; rolling the flat section ingot into sheet steel that the thickness is less than six mm, the unevenness of the carbide is less than second level, and the maximum carbide particle is less that 8 micrometer; then, according to the demand, cutting the sheet steel into quadrate or rounded the small workpiece that has the same size and after cleaning the surface piling up to the demand height and putting it into vacuum resistance diffusion welding furnace to execute phase change resistance diffusion welding technology. And the high alloy ledeburitic steel stick or block has the unevenness less than second level, the maximum carbide particle less than 8 micrometer.

Description

technical field [0001] The invention relates to a method for manufacturing high-alloy ledeburite steel, in particular to a method for manufacturing high-alloy ledeburite steel without carbide segregation by phase-change resistance diffusion welding. Background technique [0002] The high-speed steel and high-alloy cold-working die steel widely used in the field of tool and die steel are high-alloy ledeburite steel. The characteristic of ledeburite steel is that the steel ingot will form a ledeburite eutectic with a large number of carbides in the final stage of solidification. The higher the alloy content and carbon content of the steel, the more the amount of Leyburn eutectic, and the coarser the carbide in the Layblade eutectic. Hot forging the solidified steel ingot can break the Leybolt eutectic, but it can't make the carbide distribution completely uniform, and can't make the carbide finer. The larger the forging ratio, the higher the degree of crushing of the Leybolt...

AI Technical Summary

Problems solved by technology

The efficiency of these two methods is not high, which affects the quality and efficiency of phase change diffusion welding

[0018] The resistance welding and phase change diffusion welding mentioned above are not suitable for manufacturing carbide-free segregation high-alloy ledeburite steel alone. Combining the two together into phase change resistance diffusion welding is a new welding process. A new process welds ledeburite steel sheets without carbide segregation, that is, with carbide non-uniformity less than 2 grades, to make high-alloy ledeburite steel without carbide segregation. At present, there is no such production without carbonization. Process for segregating high-alloy ledeburite steel