铸造技术2025，Vol.46Issue(10)：995-1002,8.DOI:10.16410/j.issn1000-8365.2025.5086
组织不均匀性和几何必须位错对18Ni马氏体钢包辛格效应的影响
Impact of Microstructural Inhomogeneity and Geometrically Necessary Dislocations on the Bauschinger Effect in 18Ni Maraging Steel
摘要
Abstract
Maraging steel is indispensable in aerospace,automotive,and other fields because of its excellent balance of strength and toughness.However,the Bauschinger effect,which is commonly induced by cyclic loading during service,can significantly alter a material's yield strength.This leads to a loss of dimensional accuracy and even premature fatigue failure,thereby compromising service reliability.Current research still lacks a systematic understanding of how microstructural heterogeneity regulates the Bauschinger effect.By analysing the cyclic deformation behavior of 18Ni(300)steel under solution-treated(ST)and solution-treated plus aged(STA)conditions,combined with characterization via electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM),this study reveals that the synergistic effect of nonuniform martensite block size distribution and localized enrichment of geometrically necessary dislocations(GND)is the key mechanism exacerbating the Bauschinger effect.Research has demonstrated that homogenizing a material's microstructure and GND density through appropriate heat treatment protocols is an effective approach to mitigate the Bauschinger effect.关键词
18Ni马氏体钢/包辛格效应/几何必需位错/组织不均匀性Key words
18Ni maraging steel/Bauschinger effect/geometrically necessary dislocations(GND)/microstructural heterogeneity分类
金属材料引用本文复制引用
赵金泽,钟宏,朱嘉锡,李博,李双明..组织不均匀性和几何必须位错对18Ni马氏体钢包辛格效应的影响[J].铸造技术,2025,46(10):995-1002,8.基金项目
凝固技术全国重点实验室(西北工业大学)自主研究课题(2024-TS-05) （西北工业大学）
