选区激光熔化Inconel 718合金的沉淀析出行为及力学性能
Precipitation behavior and mechanical properties of Inconel 718 alloy prepared by selective laser melting
汪英芝 1郑留伟 2杨飞 1聂豫晋 1孟立鑫 1尹磊 1梁伟2
作者信息
- 1. 太原理工大学材料科学与工程学院,山西太原 030024
- 2. 太原理工大学材料科学与工程学院,山西太原 030024;太原理工大学分析测试中心,山西太原 030024
- 折叠
摘要
采用选区激光熔化成形技术制备了 Inconel 718合金,并对沉积态合金进行双时效和固溶+双时效处理.采用扫描电镜、电子背散射衍射仪、透射电镜和万能试验机研究不同热处理状态下合金沉淀析出行为及拉伸性能.结果表明,时效并不能消除Laves相,直接时效后合金中Laves相仍存在,强化相γ'和γ"含量较沉积态有所上升,强度显著提高,塑性明显下降.1150℃高温固溶+双时效后合金完全再结晶,亚结构消失,脆性Laves相完全溶解,强化相γ'、γ"相含量大幅提升,强度有所上升,塑性下降,合金抗拉强度、屈服强度和伸长率分别达到1330 MPa、1110 MPa和16.73％.固溶+双时效工艺在提升材料强度的基础上保证了材料塑性,使Inconel 718合金获得良好的综合力学性能.
Abstract
Inconel 718 alloy was prepared by selective laser melting(SLM),and the as-deposited alloy was double aged(DA)and solution+double aged(SA).The precipitation behavior and tensile properties of the alloy under different heat treatment states were studied by means of scanning electron microscope,electron backscattered diffraction,transmission electron microscopy,and universal testing machine.The results show that aging alone cannot eliminate the Laves phase.After direct aging,the Laves phase still exists in the alloy,but the content ofγ'and γ"strengthened phase is higher than that of the deposited state.The strength of the material significantly increases,and the plasticity significantly decreases.After high-temperature solid solution treatment at 1150 ℃ followed by double aging,the alloy is completely recrystallized,and the substructure disappears.The brittle Laves phase dissolves completely,and the content of the strengthened phases γ'and γ"phases increases significantly.The strength increases and plasticity decreases compared to the as-deposited specimen.The tensile strength,yield strength and elongation of the alloy reaches 1330 MPa,1110 MPa and 16.73％,respectively.The solution+double aging process,while enhancing the material's strength,ensures plasticity,which makes the Inconel 718 alloy to have excellent comprehensive mechanical properties.
关键词
Inconel/718合金/选区激光熔化/热处理/析出相/力学性能Key words
Inconel 718 alloy/selective laser melting/heat treatment/precipitated phase/mechanical properties引用本文复制引用
基金项目
山西省自然科学基金面上项目(20210302123163)
出版年
2024
NETL
NSTL
万方数据