Fused Deposition Modelling FDM is one of GM techniques havin

Fused Deposition Modelling (FDM) is one of GM techniques having unique advantage of variety of raw materials and modelers it Schaftoside offers [13]. It has the capability to produce intricate and complex shapes with reasonable time and cost requirements [5]. FDM has been widely used for various defence applications by different military manufacturers including EOIR technology, RLM industries, Sheppard air base, Tiberius arms, etc. [14]. These applications vary from prototypes, end products, guns, design modifications, etc. Several authors successfully fabricated various functional components using FDM by investigating the effect of various process parameters like raster width, air gap, slice height, etc. [15–17]. Srivastava et al. [15] experimentally investigated the effect of various process parameters upon responses with an aim to achieve layout optimization. Vasudevarao et al. [16] proposed an experimental design to determine significant factors and their interactions for optimal surface finish of parts fabricated via Fused Deposition Modelling process. Sood et al. [17] carried out parametric appraisal of the factors affecting the various mechanical properties of components fabricated by FDM process.
Experimental procedure
Results and discussions Table 4 presents the observation table for BT corresponding to 86 run RSM design for each spatial orientation. The readings for BT are noted directly from FDM control center.
Conclusions This work successfully develops significant and meaningful RSM models for build time in terms of various process parameters. Effects of varying spatial orientation have been established and numerous critical and important conclusions can be drawn from this research. The same scheme of experimentation can be easily applied to six remaining CSG primitives and results can be compiled to provide universally acceptable principles for orientation of a given component in the modeller build volume. Following are the important conclusions that can be drawn from this case study:
Introduction Marine components such as propellers, pumps, impellers experiences erosion-corrosion problems under the solid particle impingement and other flow based environmental conditions. Due to this, every year the ship builders are spending billions of dollars to combat the erosion-corrosion (E-C) degradations [1,2]. Stainless steels are widely used to make many of the marine components because of its capability of resistance to hazardous corrosion, erosion and abrasion damages [3]. Of these, AISI 316L stainless steel provides good E-C resistance under solid particle and slurry based impingement conditions, because of rich content of chromium oxide passive film which resist the surface destructions even in rapid fluid flow and higher temperature conditions (up to 60 °C) [4,5]. Erosion- Corrosion forms on top surfaces and critical sections of the components which are affected by high velocity of fluid flow and slurry impingements. Recently many researchers [6–8] have attempted various coatings on the stainless steel substrate and these coatings include metallic, non metallic and ceramics coatings. Even though organic coatings are cost effective and used in limited applications, Nonsense codon exhibit less resistance to solid particle impingement. Advanced erosion resistance and better binding strength of metallic and ceramics coatings grab more interest in E–C field. It is understood from the literature that ceramics coatings, thermally sprayed WC/Co–Cr and WC coatings are predominantly used for improving E-C resistance. Recently, a new kind of thermally sprayed iron based amorphous metallic powders (AMCs) were developed with low cost and high hardness [9]. The fabrication of amorphous coatings requires fast cooling rate to prevent formation of nucleation and nucleation growth. Due to this, the microstructure of coating does not contain any crystalline grains and grain boundaries and found to be the sizes of crystallites are in nano scales [10].