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Wear behaviour of deep cryogenically treated coated tool during end milling of XH67MBTHO

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 2025年

作者： Sasi, Jayaram C Mathew, Jose George, Allan Kuriachen, Basil Dhanish, P.B. Oommen, George Anoop, C.R. Advanced Manufacturing Centre Department of Mechanical Engineering National Institute of Technology Calicut Calicut India Materials and Manufacturing Entity LPSC Indian Space Research Organisation Trivandrum India Control System and Components Entity LPSC Indian Space Research Organisation Trivandrum India

XH67MBTHO is a Ni-based superalloy which finds usage in high temperature applications of aero engines. However, attributed to some of their inherent properties like strain hardening and poor thermal conductivity, tool life characteristics are adversely affected during the machining operations. The use of conventional TiAlN coated tools can address the tool wear issues faced during machining of similar Ni-based alloys. However, severe coating delamination, and significant adhesion wear mechanisms could negatively influence the effectiveness of the tools at dry lubricating conditions. The current study investigates the influence of a sustainable manufacturing technique through DCT (Deep Cryogenic Treatment) and its impact on coated tool inserts to address the tool wear issues under dry machining conditions. The DCT aids in the formation of η (eta) phase carbides, β-phase densification etc. Hence, the tool substrate develops significant wear resistance and fracture toughness in withstanding the contact stress at the machining interface. Notch wear, micro-crack formations, and built-up layer generations were observed to be major wear mechanism, and for treated tool (TT) it was less severe. Furthermore, the maximum reduction in average flank wear widths for treated tool was observed to be 26%, while the cutting force and surface roughness values were found to be reduced by 27%, and 24% respectively compared to untreated tool (UTT). © IMechE 2025.

关键词： Milling (machining)

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Numerical and Experimental Investigation of Lambda type Seals in High-Pressure Cryogenic Bolted Joints 73

Numerical and Experimental Investigation of Lambda type Seal...

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73rd International Astronautical Congress, IAC 2022

作者： Vivek, S. Vinayaravi, R. Tripathi, Suryamani Vasudevan, R. Asraff, A.K. Thermo-structural Analysis Division Structural Dynamics and Analysis Group Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre Thiruvananthapuram695547 India Flow Control Valves Division Control Systems Valves Modules and Umbilical Group Control System and Components Entity Liquid Propulsion Systems Centre Thiruvananthapuram695547 India Structural Dynamics and Analysis Group Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre Thiruvananthapuram695547 India Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre Thiruvananthapuram695547 India

For propelling new generation Indian launch vehicles, ISRO is developing a liquid oxygen-kerosene based high thrust rocket engine. In liquid rocket engines, bolted flange joints are critical components and leak tightness is to be ensured for all bolted joints for safe operation. For the same reason, various metallic seals are employed and "lambda" (λ) type seal is one among them. There is little information about this type of seals in literature and its geometry is uncommon and intricate. This seal, made of high strength stainless steel has 5 sealing faces and interfaces of mating flanges are spherical in nature. Bolted joint investigated in this study is located at the inlet of an injection valve. Extensive nonlinear finite element simulations were carried out for understanding the normal load variation at each of these sealing faces with increase in internal pressure. For validating the numerical model as well as to verify the seal performance, a simulator joint was designed and tested. Multiple tests were carried out to study the effect of temperature of operating medium on the seal behaviour. The results indicate that, both at cryogenic temperatures as well as at ambient conditions, lambda type seals can provide leak tightness at very high internal pressure with moderately low pre-load values and can accommodate large flange movements. Results are of high relevance for finalizing the preload values for similar bolted joints in flight hardware. © 2022 International Astronautical Federation, IAF. All rights reserved.

关键词： Bolted joints

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Wear Behaviour of Deep Cryogenically Treated Coated Tool During End Milling of Xh67mbtho

SSRN

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SSRN 2024年

作者： Sasi, Jayaram C. Mathew, Jose George, Allan Kuriachen, Basil Dhanish, P.B. Oommen, George Anoop, C.R. Advanced Manufacturing Centre Department of Mechanical Engineering National Institute of Technology Calicut India National Institute of Technology Materials and Manufacturing Entity LPSC Indian Space Research Organisation India Control System and Components Entity LPSC Indian Space Research Organisation India

Current study investigates the influence of deep cryogenic treatment on wear mechanisms across the WC milling inserts while machining XH67MBTHO, a nickel-based superalloy which finds enormous applications in high temperature applications of aerospace engines. With aid of SEM and EDS analysis various mechanism of tool wear including diffusion, abrasion, plastic deformation was studied observed for both cryo treated and untreated tool. A maximum reduction of 26% on flank wear, 48.93% on worn out crater area, 26.97% on resultant cutting force,23.8% on surface roughness was observed while using treated tool in comparison with untreated. © 2024, The Authors. All rights reserved.

关键词： Cryogenics

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