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American Society for Testing and Materials

Fundamentals of Modern Manufacturing: Materials, Processes and Systems

This paper presents an overview of the recent advances in high performance cutting of aerospace alloys and composite currently used in aeroengine and aerostructure applications. Progress in cutting tool development and its effect on tool wear and surface integrity characteristics of difficult to machine materials such as nickel based alloys, titanium and composites is presented. Further, advances in cutting technologies are discussed, focusing on the role of hybrid machining processes and cooling strategies (MQL, high pressure coolant, cryogenic) on machining performance. Finally, industrial perspectives are provided in the context of machining specific components where future challenges are discussed.

High performance cutting of advanced aerospace alloys and composite materials

https://escholarship.org/content/qt6226v74d/qt6226v74d.pdf?t=qki0rx

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

An appropriate cellular response to implanted surfaces is essential for tissue regeneration and integration. It is well described that implanted materials are immediately coated with proteins from blood and interstitial fluids, and it is through this adsorbed layer that cells sense foreign surfaces. Hence, it is the adsorbed proteins, rather than the surface itself, to which cells initially respond. Diverse studies using a range of materials have demonstrated the pivotal role of extracellular adhesion proteins—fibronectin and vitronectin in particular—in cell adhesion, morphology, and migration. These events underlie the subsequent responses required for tissue repair, with the nature of cell surface interactions contributing to survival, growth, and differentiation. The pattern in which adhesion proteins and other bioactive molecules adsorb thus elicits cellular reactions specific to the underlying physicochemical properties of the material. Accordingly, in vitro studies generally demonstrate favorable cell responses to charged, hydrophilic surfaces, corresponding to superior adsorption and bioactivity of adhesion proteins. This review illustrates the mediation of cell responses to biomaterials by adsorbed proteins, in the context of osteoblasts and selected materials used in orthopedic implants and bone tissue engineering. It is recognized, however, that the periimplant environment in vivo will differ substantially from the cell–biomaterial interface in vitro. Hence, one of the key issues yet to be resolved is that of the interface composition actually encountered by osteoblasts within the sequence of inflammation and bone regeneration.

Mediation of biomaterial-cell interactions by adsorbed proteins: A review

This paper deals with the machinability of nickel-based superalloys using abrasive water jet machining process. The machining studies were carried out with three different parameters such as water jet pressure, traverse speed of jet nozzle, and standoff distance at three different levels. The performances of the process parameters are evaluated by measuring difference in kerf width, kerf wall inclination, and material removal rate (MRR). Further, the surface morphology and material removal mechanisms are analyzed through scanning electron microscope (SEM) images. It is found that water jet pressure is the most influencing factor related to surface morphology and surface quality.

Machinability of Nickel-Based Superalloy by Abrasive Water Jet Machining

The filler materials are reinforced along with natural fibers in the composite to improve the quality and property of the component materials based on the requirements and its applications. In this paper, hybrid natural fiber composites were developed with and without filler materials as reinforcement. The developed hybrid natural fiber composites are machined using abrasive water jet cutting process with three different cutting parameters. The influences of cutting parameters are evaluated with respect to the kerf wall inclination, material removal rate, and surface roughness. The surface morphology was also studied to infer the basic mechanism involved during composite machining. The hybrid fiber composite with filler has proved that it can produce good engineering component without delamination and fiber pullouts during machining.

Machinablity of Hybrid Natural Fiber Composite with and without Filler as Reinforcement

Machinability of glass fibre reinforced plastic (GFRP) composite using alumina-based ceramic cutting tools

This paper investigates the cyclic oxidation and hot corrosion behavior of Inconel 617 at elevated temperatures. The substantial role of alloying elements with respect to oxidation and hot corrosion were analyzed with respect to corrosion kinetics, surface morphology and X-ray analysis of the oxide scales formed. The cumulative mass change shows that the presence of V2O5 in salt mixture plays predominant role in corrosion attack. Consistency of oxide scale, rich in Cr2O3, NiO, Al2O3 and NiCr2O4 was confirmed through X-ray analysis. Inconel 617 has good oxidation resistance and prone to corrosion attack at elevated temperatures due to the presence of vanadium in salt mixture which accelerates hot corrosion.

Oxidation and Hot Corrosion Behavior of Nickel-Based Superalloy for Gas Turbine Applications

Machinability of human implant materials without causing any surface damage is a challenge on current research. The effect of heat-affected zone (HAZ), load experienced, and chemical reaction after implantation are the profound factors influencing on degradation of implant machined surface. An attempt is made to study the machinability of titanium-based human implant materials. While machining, the surface quality of the implant materials with reference to electrochemistry and metallurgical behavior of plasma energy produced are investigated in detail. Materials removal and its surface quality during plasma spark were measured as a response on machining process. The influence of pulse on/off time and the voltage varied during experimentation are evaluated using factorial design. Further, the machined samples are subjected to metallurgical characterization studies using microscopic (SEM) and spectroscopic (EDS) analysis. Increase in voltage has produced better surface finish and reduced recast laye...

M. Adam Khan

Papers

Machinability of Nickel-Based Superalloy by Abrasive Water Jet Machining

Machinablity of Hybrid Natural Fiber Composite with and without Filler as Reinforcement

Machinability of glass fibre reinforced plastic (GFRP) composite using alumina-based ceramic cutting tools

Oxidation and Hot Corrosion Behavior of Nickel-Based Superalloy for Gas Turbine Applications

Processing of titanium-based human implant material using wire EDM