Finite Element Analysis of Impact-Velocity Effects on the Erosion Behavior of GH4720Li Superalloy-Based Cr₃C₂ Coatings

Riki Hendra Purba (Universitas Pembangunan Nasional Veteran Jakarta)
Raffi Indrajati (Universitas Pembangunan Nasional Veteran Jakarta)
Fitri Wahyuni (Universitas Pembangunan Nasional Veteran Jakarta)
James Julian (Universitas Pembangunan Nasional Veteran Jakarta)
Elvi Armadani (Universitas Pembangunan Nasional Veteran Jakarta)
Fathin Muhammad Mahdhudhu (Universitas Pembangunan Nasional Veteran Jakarta)

Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi
Volume 8 Number 1 (2026)

This study examines the effect of impact velocity on the erosion behavior of GH4720Li superalloy with and without Cr₃C₂–NiCr coating using Finite Element Analysis. Silica particles (0.7 mm) were modeled at velocities of 25–125 m/s under normal impact. Results show that increasing velocity raises the maximum Von Mises stress before reaching a dynamic equilibrium. Coated specimens exhibited nearly twice the stress values of uncoated ones, indicating better load distribution and initial damage resistance. At low velocities (25–50 m/s), the coating reduced plastic deformation by absorbing impact energy. However, at higher velocities (≥75 m/s), the coating transferred more energy to the substrate, causing greater plastic strain than in uncoated material. These findings demonstrate that cermet coatings improve erosion resistance at low-to-moderate velocities but have limited performance under high-velocity impacts