材料工程2025，Vol.53Issue(5)：63-73,11.DOI:10.11868/j.issn.1001-4381.2024.000209
直接时效对电弧增材制造18Ni350马氏体时效钢组织和性能的影响
Effect of direct aging on microstructure and properties of 18Ni350 maraging steel fabricated by wire arc additive manufacturing
摘要
Abstract
The 18Ni350 maraging steel(M350)straight-wall component is fabricated using wire arc additive manufacturing(WAAM)process.By employing direct aging heat treatment,the microstructure and mechanical properties of M350 are controlled.The effect of different aging conditions(aging temperature and aging time)on the microstructure and performance of M350 is studied.The results show that the solidification microstructure of M350 fabricated by wire arc additive manufacturing consists of columnar dendrites and cellular dendrites,with segregation of Ni,Mo,and Ti elements observed in the interdendritic regions.During the direct aging process,a reverse transformation occurs in the interdendrite region where Ni,Mo,and Ti elements segregate,leading to the conversion of martensite phase to austenite phase.With the increase of aging temperature and aging time,the size and quantity of reversed austenite increase.The microhardness,yield strength(YS),and ultimate tensile strength(UTS)first increase and then decrease.The peak microhardness(534HV),YS(1600 MPa),and UTS(1658 MPa)are achieved at 530℃aging for 3 h.At the same time,the elongation after fracture remains a value above 13%.In addition,the M350 fabricated by wire arc additive manufacturing demonstrates mechanical anisotropy,with the anisotropy difference peaking under the optimal aging conditions,exhibiting a YS difference of 360 MPa and a UTS difference of 287 MPa.关键词
电弧增材制造/马氏体时效钢/直接时效/奥氏体逆转变/各向异性Key words
wire arc additive manufacturing/maraging steel/direct aging/austenite reverse transformation/anisotropy引用本文复制引用
段梦伟,柏关顺,郭顺,王浩,章晓勇,黄勇,彭勇,周琦,王克鸿..直接时效对电弧增材制造18Ni350马氏体时效钢组织和性能的影响[J].材料工程,2025,53(5):63-73,11.基金项目
江苏省自然科学基金(BK20232038) （BK20232038）
国家自然科学基金(52105367,52305380) （52105367,52305380）
