A laser additive manufacturing method for high carbon-high strength gradient steel components

Abstract

The invention discloses a method for laser additive manufacturing of high-carbon-high-strength gradient steel components, comprising: 1) pretreating the surface of a high-carbon eutectoid steel substrate; 2) pre-preparing Ni- V binary pure metal mixed transition layer powder; 3) Precipitation-strengthened stainless steel for laser additive manufacturing; 4) Subsequent heat treatment. In order to solve the limited application field caused by the poor plastic deformation processing ability of high-carbon steel, the present invention proposes to form a complex structure area with low-carbon high-strength steel to form a high-carbon-high-strength gradient steel component, in order to prevent the intergranular coarse chromium carbonization in the transition zone The Ni-V transition layer material is designed by itself, and the austenite is stabilized by the Ni element to enhance the solid solution ability of the carbon element. At the same time, the V element is used to preferentially consume the C element. Under the manufacturing process parameters, the formation of coarse chromium carbides and cracks in the transition zone is avoided.

Description

technical field [0001] The invention relates to the technical field of high-strength carbon steel structural parts, in particular to a high-carbon-high-strength gradient steel component and a laser additive manufacturing method thereof. Background technique [0002] High carbon steel with carbon content near the eutectoid point is widely used in industrial production fields such as tools and molds because of its low price and high strength and hardness. However, high carbon content often leads to poor inherent plastic deformation ability and toughness, and it cannot be manufactured into complex shape components through large deformation cold working and other processes. [0003] For complex structural areas of high-carbon steel components, low-carbon high-strength steels with comparable mechanical properties to high-carbon steels and excellent formability are used instead of high-carbon steels to form high-carbon-high-strength steel components that can give full play to the ...

AI Technical Summary

Problems solved by technology

However, due to the dilution of the eutectoid steel matrix during the additive process, the carbon content in the transition zone will increase significantly

The deposited low-carbon high-strength steel is rich in alloying elements in order to meet the strength requirements. In the transition zone, alloying elements such as Cr and Nb are easily combined with carbon elements provided by the high-carbon steel matrix to form coarse carbides distributed in the grain boundaries, reducing the grain size. boundary strength

Under the combined effects of thermal stress and structural stress, defects such as cracks are easily formed at the carbide-rich grain boundaries in the transition zone, which endangers the overall performance of the component

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