Multi-scale simulation of nanoindentation on cast Inconel 718 and NbC precipitate for mechanical properties prediction

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• 作者：Chenghui Ye^a ; ¹ ; Jieshi Chen^a ; ^c ; ¹ ; Mengjia Xu^a ; Xiao Wei^a ; Hao Lu^a ; ^b ; ^{shweld@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Finite element method ; Nanoindentation ; Nickel based superalloys ; Plasticity
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：26 April 2016
• 年：2016
• 卷：662
• 期：Complete
• 页码：385-394
• 全文大小：4512 K

文摘

Multi-scale simulation of nanoindentation on cast Inconel 718 superalloy and its NbC precipitate were performed with combined first principle study and crystal plasticity finite element method (CPFEM). The concerned parameters were calibrated through a representative volume element (RVE) model compared with the stress–strain curves obtained from tensile tests. Nanoindentation was carried out on the matrix. First principle calculations were applied to estimate the mechanical properties of precipitate NbC, including elastic modulus and hardness. The simulated force–displacement curves match well with the experimental results. The simulated results indicate that the local pile-up pattern in the indentation zone depends significantly on the crystallographic orientations. In addition, large precipitate NbC inserted in the matrix was also indented and simulated. The elastic modulus calculated by first principle is quite accurate while the yield stress is determined using inversion calculations. It appears that the proposed CPFE analysis approach combined with first principle calculation do help estimate the mechanical behavior of large precipitates on the Ni-based superalloy.