新型热处理制度获得高强高韧激光3D打印IN718合金

Novel Post Heat Treatment Strategy to Obtain Laser 3D Printed IN718 Superalloy with High Strength and High Toughness

摘要:

激光选区熔化（SLM）成型的IN718高温合金，存在高温强度及韧性无法兼得的难题。针对此问题，通过Double Doelhert设计矩阵优化IN718的激光3D打印参数，研究不同热处理制度与IN718力学性能的关系。结果表明：通过参数调控，可使SLM成型试样的致密度达到99.9%；通过采用创新性开发的固溶+短时双时效后处理制度，可获得高强、高韧的激光3D打印IN718合金，其力学性能全面达到锻件的技术指标。该办法为SLM成型IN718合金组织调控提供了新思路，新型后处理制度可广泛应用于SLM成型的航空发动机零件。

Abstract:

IN718 superalloy formed by selective laser melting （SLM） has the problem that high temperature strength and high toughness cannot be achieved at the same time. To solve this problem， this study optimized the laser 3D printing parameters of IN718 through the Double Doublehert design matrix， and studied the relationship between different heat treatment strategies and mechanical properties. The results showed that the density of the SLM-formed sample can reach 99.9% through parameter adjustment， and then through the innovative development of solid solution+short-term double aging post-treatment strategy， high strength and high toughness laser 3D printed IN718 alloy can be obtained， and the mechanical properties fully reached the technical indicators of forgings. This study provides a new idea for microstructural control of SLM formed IN718 alloy， and the new post-treatment strategy can be widely used in SLM forming of aeroengine parts.