A high strength and toughness lattice structure of twip steel and a 3D printing preparation and performance regulation method thereof

By using 0.02C30Mn3Al3Si type TWIP steel as the matrix material, combined with laser selective melting and heat treatment processes, a high-strength, high-toughness, and energy-absorbing TWIP steel-based lattice structure was prepared, solving the problem of uneven as-cast microstructure and realizing the preparation of high-performance lattice structures.

CN116441563BActive Publication Date: 2026-07-24ANHUI ZHONGKE GAOREN NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI ZHONGKE GAOREN NEW MATERIAL CO LTD
Filing Date
2023-03-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing technologies, TWIP steel-based lattice structures prepared by laser selective melting 3D printing cannot be plastically processed after forming. The matrix structure is a cast structure formed by rapid solidification, resulting in uneven composition and properties, making it difficult to achieve the design goals of high strength, toughness, and high energy absorption.

Method used

Using 0.02C30Mn3Al3Si type TWIP steel as the matrix material, a top-to-top quadrangular prism or pyramid lattice structure is printed by laser selective melting. Combined with low-temperature stress-relief annealing, high-temperature recrystallization annealing and surface shot peening, the process parameters and heat treatment processes are optimized to form a matrix structure with dense structure, fine grains and uniform composition.

Benefits of technology

The TWIP steel-based lattice structure achieves high strength, toughness, and high energy absorption. The material's mechanical properties are close to those of conventional rolled processing, with tensile strength reaching 710–773 MPa and elongation after fracture of 54–64%. The load-bearing capacity of the lattice structure is 1.37 times higher than that of the same stainless steel-based lattice structure.

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Abstract

The application discloses a TWIP steel-based high-strength and high-toughness lattice structure and a 3D printing preparation and performance regulation method. The lattice structure substrate is any type of TWIP steel, the cell configuration and periodic structure are modeled and designed according to CATIA software, the lattice structure is prepared by using high selective laser melting 3D printing technology, and the substrate material is regulated by heat treatment at different temperatures and surface shot peening. The tensile strength of the sample printed in the furnace reaches 710-773 MPa, and the elongation after fracture reaches more than 54%. The cell rod element can be solid or hollow. The solid rod diameter is 1.5-6.0 mm; the hollow rod outer diameter is 2.0-6.0 mm, and the wall thickness is 0.6-1.0 mm; the length is 15.0-25.0 mm; the rod element and the projection plane are at an angle of 30-60 DEG; and the compressive strength is 1.0-2.0 MPa.
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