后处理工艺对一种激光增材制造镍基高温合金组织与性能的影响
Influence of Post-Treatment Process on Microstructure and Properties of Laser Additively Manufactured Nickel-Based Superalloy
陈爽 1杨彦红 2郭志强 3梁静静 2李金国 2周亦胄2
作者信息
- 1. 沈阳工业大学材料科学与工程学院,辽宁沈阳 110870;中国科学院金属研究所,辽宁沈阳 110016
- 2. 中国科学院金属研究所,辽宁沈阳 110016
- 3. 沈阳工业大学材料科学与工程学院,辽宁沈阳 110870
- 折叠
摘要
在激光增材制造过程中,镍基高温合金存在裂纹和微孔等缺陷,阻碍其在各领域应用.将热等静压(HIP)与传统热处理(HT)相结合,以获得缺陷少且性能理想的激光粉末床熔融(LPBF)镍基高温合金零件.结果表明,HIP工艺提高致密度,传统HT改善显微缺陷并提高力学性能.经HIP处理后,LPBF试样缺陷体积分数下降,经HT处理后,HIP+HT缺陷含量略有上升.经后处理后,硬度呈下降趋势,室温下,HIP+HT试样的抗拉伸强度和断后伸长率分别提高到1326MPa和21.3％.
Abstract
Defects such as cracks and micropores exist in nickel-based superalloy during laser powder bed fusion(LPBF),hindering their application in various fields.Hot isostatic pressing(HIP)was combined with conventional heat treatment(HT)to obtain LPBF nickel-based superalloy parts with ideal properties and fewer defects.The results show that HIP process can improve the densification,while the conventional HT can eliminate the micro-defects to improve the mechanical properties.After HIP treatment,the defect volume fraction of LPBF specimens decreases.After HT,the defect content of HIP+HT specimens increases slightly.After post-treatment,the hardness shows a decreasing trend,and the tensile strength and post-break elongation of HIP+HT specimens increase to 1326 MPa and 21.3％,respectively,at room temperature.
关键词
镍基高温合金/激光粉末床熔融/后处理/组织/性能Key words
nickel-based superalloy/laser powder bed fusion/post-treatment/microstructure/properties引用本文复制引用
基金项目
National Key R&D Program of China(2021YFB3700401)
National Science and Technology Major Project(Y2019-Ⅶ-0011-0151)
Science Center for Gas Turbine Project(HT-P2022-C-IV-002-001)
出版年
2024
NETL
NSTL
万方数据