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All Journal International Journal of Innovation in Mechanical Engineering and Advanced Materials Equivalent: Jurnal Ilmiah Sosial Teknik
Kusmono Kusmono
Universitas Gadjah Mada
Automotive Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Failure Mechanism Analysis of 253MA Vortex Finder in A CFB Boiler Under High-Temperature Erosion and Refractory Deposit Exposure Martua Haposan Echo Sihite; Kusmono Kusmono
Equivalent: Jurnal Ilmiah Sosial Teknik Vol. 8 No. 3 (2026): Equivalent: Jurnal Ilmiah Sosial Teknik
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jequi.v8i3.342

Abstract

Background: Circulating fluidized bed (CFB) boilers are widely applied in coal-fired power plants due to their fuel flexibility and low emissions. The vortex finder, a key cyclone component, separates solid particles from flue gas and is prone to wear under high-temperature, erosive conditions. Objective: This study aims to identify failure characteristics, analyze the causes, and explain the failure mechanism of a 253MA vortex finder in a 2 × 100 MW CFB boiler at PLTU Sebalang after 6,548 operating hours at 850–950°C. Methods: A multi-method approach was employed, including visual inspection, positive material identification (PMI), tensile testing, microhardness testing, optical microscopy, scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and X-ray diffraction (XRD) analysis to assess mechanical and microstructural degradation. Results: The vortex finder exhibited plastic deformation, material thinning, and deposition of foreign refractory material. Tensile strength decreased from 723.89 MPa to 677.84 MPa (6.36%), elongation decreased from 58% to 53%, and hardness decreased from 218.84 HV to 210.21 HV. Microstructural changes included grain coarsening and carbide precipitation, while SEM-EDS revealed surface roughening, early microcrack initiation, and compositional changes indicative of high-temperature oxidation. XRD confirmed that the deposits consisted of alumina–silica refractory material. Conclusion: Failure resulted from a synergistic mechanism involving high-velocity particle erosion, refractory deposit accumulation, and progressive microstructural degradation. Crack initiation and propagation ultimately led to structural failure. Recommendations include implementing erosion control measures, maintaining refractory linings, applying more erosion-resistant coatings or alternative materials, and adopting condition-based inspection strategies to enhance component reliability.
Biomechanical Performance of Orthodontic Mini-Implant Materials under Different Orthodontic Loads: A Finite Element Analysis Rini Dharmastiti; Eko Budiyanto; Kusmono kusmono; Maria Goreti Widiastuti
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 8 No. 2 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v8i2.39139

Abstract

Orthodontic mini-implants are widely used as temporary anchorage devices, and their biomechanical performance is influenced by implant material and applied orthodontic load. This study aimed to provide a standardized biomechanical comparison of commercially pure titanium (CP-Ti), Ti6Al4V alloy, and stainless steel 316L orthodontic mini-implants under different orthodontic loads using three-dimensional FEA. A standardized mini-implant was modelled and inserted into layered cortical-cancellous bone model. Simulations were performed in Autodesk Fusion version 2702.1.58. All materials were assumed to be homogeneous, isotropic, and linearly elastic. Lateral load of 2 N, 4 N, 6 N were applied to simulate orthodontic force. Von Mises stress, displacement, and contact pressure at the bone-implant interface were evaluated. Increasing the applied load from 2 N to 6 N produced a proportional increase in all evaluated mechanical parameters. At the maximum load of 6 N, the maximum Von Mises stress reached 38.67 MPa for CP-Ti, 37.90 MPa for Ti6Al4V, and 44.44 MPa for SS316L. The corresponding maximum displacement values were 1.5x10-5 mm, 1.5x10-5 mm, and 1.1x10-5 mm, respectively. Maximum contact pressure at the bone implant interface reached 55 MPa, 56 MPa and 52 MPa, respectively. Increasing orthodontic load increased stress, displacement and contact pressure regardless of the material. The results indicate that orthodontic loading magnitude has a greater influence on biomechanical response than implant material, although material properties affect stress and mechanical behavior. This study provides biomechanical evidence that may support material selection for orthodontic mini-implants and guide future experimental and clinical investigations.
Co-Authors EKO BUDIYANTO Hasn Risda Azizah Martua Haposan Echo Sihite Rini Dharmastiti Widiastuti, Maria Goreti