Method for preparing high-strength-and-ductility-product additive manufacturing alloy based on TWIP effect

Abstract

The invention discloses a method for preparing a high-strength-and-ductility-product additive manufacturing alloy based on a twinning induced plasticity (TWIP) effect. The method comprises the steps that chemical components of alloy powder are designed, regulated and controlled; the granularity of alloy powder is designed, regulated and controlled; and the alloy powder is used as a raw material, forming process parameters are adjusted, the TWIP effect is fully excited in additive manufacturing of alloy, and synchronous improvement of the strength and plasticity of the alloy is achieved. Based on a TWIP effect principle in high-manganese steel, the high-strength-and-ductility-product additive manufacturing 316L stainless steel prepared through selective laser melting forming equipment is used, the maximum uniform elongation can reach 76%, the maximum strength-and-ductility product can reach 47GPa%, synchronous improvement of the strength-and-ductility performance of the alloy is achieved, and the method breaks through mechanical property indexes of commercial laser additive manufacturing 316L stainless steel alloy powder at home and abroad at present, and is expected to provide a new material design thought for developing low-cost and high-performance additive manufacturing alloy based on the TWIP effect.

Description

technical field [0001] The present disclosure relates to the technical field of metal additive manufacturing (commonly known as 3D printing), in particular, to a method for preparing a high-strength plastic additive manufacturing alloy based on twin-induced plasticity (TWIP) effect. Background technique [0002] Metal laser additive manufacturing is different from traditional manufacturing processes. It can obtain high temperature gradients, high cooling rates (quenching) and cyclic reheating-cooling (tempering) effects during the forming process. Supersaturated solid solution of elements, multi-level cross-scale structure (such as micron-scale molten pool and grain, sub-micron-scale dislocation network cell structure, nano-scale precipitated phase) and unique mechanical properties can be produced during the preparation process Performance. Therefore, how to understand and use the heat and mass transfer effects in the laser additive manufacturing process to realize the desi...

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Problems solved by technology

The study found that with the help of the special heat and mass transfer effect in the laser additive manufacturing process, a submicron-scale dislocation network cell structure can be introduced inside the 316L stainless steel grains, which can significantly improve the yield strength of the alloy (550-650MPa), however The uniform elongation drops significantly, usually less than 30%

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