In recent years, the development and use of composite materials are gaining importance in the field of aerospace, automobile, marine and other industrial applications because of their potential properties such as higher specific strength and better corrosion and fatigue properties than most metals. The ever-increasing temperatures on earth surface and the use of non-biodegradable materials for industrial applications lead to increase in global warming which forced the researchers to work on green composites that suite the properties and reliability of the metals, alloys, composites. The increase in use of polymers which are not biodegradable increases air and water pollution. Development of green composites helps to maintain ecological balance. The review of this article focuses on discussing the green matrix material and modifications needed for fibers to improve the properties of green composites.

In advanced machining processes on hard metals, fabrication of textured insert is still a challenge. To improve the machinability of a textured cutting insert the most effective factors are the area covered, design pattern, and orientation of micro-texture. For the coated cutting inserts, the fabrication of micro-grooves must not remove the coating from the surface. Due to the generation of several micro-pools of reservoir for lubricant, the novel honeycomb micro-textured groove has been designed in 3D. The femtosecond laser machine is used to fabricate the micro-textures on TiCN (Titanium Carbo-Nitride) coated tungsten carbide insert having 20 microns of coating depth. Honeycomb micro-texture has covered 2.11 mm X 2.11 mm of the area on the rack face of the cutting insert. After fabrication, the average groove width and wall thickness obtained are 57.7 microns and 29.49 microns, respectively. Fabrication has been done up to the depth of the groove of 18.6 microns. EDS (energy dispersive spectroscopy) confirms 68.2% presence of TiCN coating inside the groove with an increase of 33.7% of carbon and a decrease of 9.9% of titanium content due to laser cutting.