电焊机2026，Vol.56Issue(8)：41-48,8.DOI:10.7512/j.issn.1001-2303.2026.08.04
时效工艺对SLM超高强钢微观组织与力学性能的影响
Influence of Aging Treatment on Microstructure and Mechanical Proper-ties of SLMed Ultra-high Strength Steel
摘要
Abstract
This study systematically investigated the microstructural evolution and mechanical property variations of selec-tive laser melting(SLM)ultra-high strength steel(UHSS)subjected to different aging treatments.Through low-temperature long-duration aging(480℃×8 h)and high-temperature short-duration aging(530℃×3 h),combined with X-ray diffraction(XRD),electron backscatter diffraction(EBSD),and transmission electron microscopy(TEM)characterization,the forma-tion mechanisms of reverted austenite and nano-scale precipitates(η-Ni3Ti and Laves-Fe2Mo)were elucidated.The results demonstrate that the low-temperature long-duration aging treatment promoted the homogeneous dispersion of high-density needle-like η-Ni3Ti single-phase precipitates while maintaining a high dislocation density,thereby achieving an ultra-high strength of 2400 MPa.In contrast,the high-temperature short-duration aging treatment induced the coarsening of η-Ni3Ti precipitates accompanied by the dual-phase precipitation of Laves-Fe2Mo,leading to a diminished precipitation strengthen-ing effect with significantly reduced strength but enhanced ductility.This study provides a theoretical basis for the optimiza-tion of aging protocols and performance tailoring of SLM-processed ultra-high-strength steels.关键词
选区激光熔化/超高强钢/时效工艺/微观组织/力学性能Key words
selective laser melting/ultra-high-strength steel/aging treatment/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
王帅,王长军,姜风春,董超,苗森淼,褚韦涵,果春焕..时效工艺对SLM超高强钢微观组织与力学性能的影响[J].电焊机,2026,56(8):41-48,8.基金项目
黑龙江省重点研发计划(2024ZXDXB01) （2024ZXDXB01）
