Mathala Prithvi Raj

@anits.edu.in

Assistant Professor, Department of Mechanical Engineering
Anil Neerukonda Institute of Technology and Sciences

Mathala Prithvi Raj


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https://researchid.co/mprithviraj27

RESEARCH, TEACHING, or OTHER INTERESTS

Mechanical Engineering, Surfaces, Coatings and Films, Materials Science
11

Scopus Publications

Scopus Publications

  • High-temperature tribological performance of direct laser deposited Stellite alloy claddings on DIN 1.2714 die steel
    Mathala Prithvi Raj, Ajit Kumar Pramanick, Pritam Biswas, Manoj Kumar
    Surface Engineering, 2026
    Direct laser deposition of Co-based alloys, specifically Stellite 6 and ERCOCR-B, was employed to enhance the tribological properties of hot-forging die steel – DIN 1.2714. The microstructure of the resultant claddings exhibited a refined microstructure consisting of an γ-Co matrix interspersed with hard phases, such as M 7 C 3 , M 23 C 6 , WC, and W 2 C, predominantly located at the grain boundaries. Microhardness analysis revealed that the Stellite 6 cladding achieved a maximum hardness of 472 VHN, whereas ERCOCR-B achieved 539 VHN. The tribological performance of the claddings was analysed using a ball-on-disc tribometer at varying temperatures – ambient temperature, 450°C, and 550°C. Both claddings significantly outperformed the base material, with the improvement attributed to the existence of hard carbide phases. Notably, ERCOCR-B demonstrated superior wear resistance, reducing wear volume by 97.2% at ambient temperature, 90.8% at 450°C, and 62.5% at 550°C. Stellite 6 claddings exhibited 59.6% at ambient temperature, 79% at 450°C, and 48.5% at 550°C lower volume loss than substrate. The observed wear mechanisms included adhesive, abrasive, and oxidative interactions, with their extent varying with temperature and coating type.
  • Optimization of Turning Parameters for Zirconia-Toughened Alumina-Based Self-Lubricating Composite Cutting Tool Materials Using Grey Relational Approach
    Pujari Srinivasa Rao, Bagadi Pradeep Kumar, Dora Siva Prasad, Mathala Prithvi Raj, M.S.S. Srinivas Rao
    International Journal of Automotive and Mechanical Engineering, 2025
    Dry machining processes frequently encounter challenges, including increased cutting forces, high friction, and poor surface finishes, primarily due to the absence of lubrication. To address these issues, this study introduces the development of solid-lubricating cutting tools (SLTs) by incorporating elements such as Nichrome, silver, molybdenum, strontium sulfate, and calcium fluoride into a Zirconia Toughened Alumina matrix. The objective was to enhance the tribological performance of cutting tools for turning AISI 4340 steel under dry conditions. An experimental design based on the L8 mixed orthogonal array was employed, and the Grey-Taguchi analysis method was used to optimize multiple performance measures, including cutting forces, coefficient of friction, and surface roughness. Among the fabricated tools, SLT 4 exhibited superior performance. The results demonstrated a 73% reduction in cutting forces, a 45% decrease in the coefficient of friction, and a 66% improvement in surface finish compared to the unmodified base tool. These enhancements were attributed to the formation of a stable self-lubricating layer on the tool surface during machining. A confirmation experiment validated the optimization outcomes, confirming the effectiveness of the proposed tool composition.
  • Die design optimization for improvement of hot forging die life
    Mathala Prithvi Raj, Ajit Kumar Pramanick, Manoj Kumar
    Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering, 2025
    In the present investigation, an attempt is made to improve the hot forging die life by reducing load and wear. An approach for optimization of multi-stage hot forging die design by combining Grey–Taguchi analysis and finite elemental analysis (FEA) with tribology study is presented. As a practical example, the forging of a multi-axle differential spider is considered. The die's critical section is defined using five geometric parameters. For each geometric parameter, four levels are considered to vary the die design. Taguchi L16 design of experiments is proposed to reduce the number of experiments. Forging load and wear depth are the considered response parameters in both the blocker & finisher. An estimation of responses is done for each design using finite element simulations. The Grey–Taguchi analysis is incorporated to optimize the parameters, and regression analysis is adopted to establish a relation between input and output parameters. It is observed that the optimal die set resulted in a significant reduction of wear depth (blocker wear depth - 25% and finisher wear depth - 10%) and load (blocker load - 16%). The tribological analysis is done to validate the optimal design. For tribological analysis, the simulation data (contact pressure, sliding velocity (mm/s), and die temperature) is extracted and converted to input data (load, speed (rpm), and temperature) for the tribometer. The wear analysis reveals that the optimal die set reduces wear depth and wear volume, leading to die life improvement.
  • Optimization and high-temperature wear characterization of Stellite alloy claddings developed using TIG welding on 56NiCrMoV7 die steel
    Mathala Prithvi Raj, Ajit Kumar Pramanick, Pritam Biswas, Manoj Kumar
    Surface and Coatings Technology, 2024
  • A novel hybrid framework for prioritization of failure modes during forging die-design
    Abhishek Sharma, Mathala Prithvi Raj, V. M. S. Hussain
    Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2024
  • Parametric optimization in co-axial laser powder deposition of cobalt-base alloys on DIN 1.2714 die steel
    Mathala Prithvi Raj, Ajit Kumar Pramanick, Manoj Kumar
    Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science, 2024
    In this work, cobalt-based powders (Stellite 6 and Stellite 12) were deposited on the hot forging die steel (DIN 1.2714) by direct laser deposition using a 2 kW Yb-fiber laser. Single tracks were developed by varying process parameters—powder mass flow rate (25–35 g/min), laser power (800–1100 W), and scan speed (400–800 mm/min). Further, the influence of these process parameters on clad geometry and dilution rate was studied. Optimization of parameters was carried out using grey analysis, and the results were analyzed based on analysis of variance (ANOVA). It was observed that the optimal parameters for Stellite 6 cladding are a powder mass flow rate of 25 g/min, laser power of 1100 W, and a scan speed of 400 mm/min. In contrast, the optimal parameters for Stellite 12 are a powder mass flow rate of 35 g/min, laser power of 1100 W, and a scan speed of 800 mm/min. In addition, a correlation between input and output parameters was established using regression analysis. The micrographs of the single-track cladding developed under optimal parametric conditions consist of fine cellular structure at the clad-surface interface followed by course cellular dendrites and fine equiaxed grains at the surface of the cladding. Stellite 12 cladding exhibits higher hardness (545 ± 10 HV0.3) than Stellite 6 cladding (470 ± 10 HV0.3) due to the formation of more refined grains.
  • Studies of Friction for Different Forging Lubricants Using Ring Compression Test
    Manoj Kumar, Mathala Prithvi Raj
    Lecture Notes in Mechanical Engineering, 2023
  • Microstructure and hardness evaluation of Stellite 6 coating developed on hot forging die steel using gas tungsten arc cladding process
    Mathala Prithvi Raj, Manoj Kumar, Ajit Kumar Pramanick
    Materials Today Proceedings, 2022
  • Modeling and Simulation of Flashless Forging of Coupling Flange
    Mathala Prithvi Raj, Manoj Kumar, Ajit Kumar Pramanick
    Springer Proceedings in Materials, 2022
  • Failure mode and effects analysis of forging die design: An integrated approach
    Abhishek Sharma, V.M.S. Hussain, P. Abhishek Kumar, Mathala Prithvi Raj
    Materials Today Proceedings, 2022
  • Yield improvement in hot forging of differential spider
    Mathala Prithvi Raj, Manoj Kumar, Ajit Kumar Pramanick
    Materials Today Proceedings, 2019