http://nopr.niscpr.res.in/handle/123456789/44698 Sun, 11 Oct 2026 02:48:48 GMT 2026-10-11T02:48:48Z http://nopr.niscpr.res.in/handle/123456789/44726 Title: Comprehensive study of effect of process parameters in equal channel angular pressing Authors: Dayal, Atul; Sahai, Ankit; Raj, K Hans; Sharma, Rahul Swarup Abstract: In present work, comprehensive study of equal channel angular pressing (ECAP) process is attempted for analyzing the influence of process parameters, viz., channel angle (<em>Φ</em>), the angle of curvature (<em>Ψ</em>), plunger velocity (<em>v</em>), processing routes (<em>R</em>), shear friction (<em>m</em>) at die and billet interface and the number of ECAP passes (<em>N</em>). This study will help to understand ECAP process with a better insight into influence of multiple process parameters and develop improved ECAP process with two objectives, i.e., (i) high and uniform distribution of equivalent strain in ECAPed billet and (ii) minimum pressing requirement during the process along with selection of best process parameters without committing to expensive tooling and machinery. ECAP study is performed on the AA6061 aluminum alloy. ECAPed billet is mechanically tested. The usefulness of experimental and FEM analysis in developing practical ECAP process is demonstrated in this paper. The outcome of this work certainly provides momentum in the commercialization of ECAP process. Page(s): 113-121 Sun, 01 Apr 2018 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/44726 2018-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44725 Title: SiC_p/glass fibers reinforced epoxy composites: Wear and erosion behavior Authors: Antil, Parvesh; Singh, Sarbjit; Manna, Alakesh Abstract: Glass fibers reinforced polymer composite materials are widely used in shipping and aerospace industries due to their superior mechanical and chemical properties. In these applications, materials are subjected to surface abrasion due to constant abrasive particle slurry interactions with the composites. This constant interaction of composites with abrasive particle slurry diminishes the composite strength and leads to unwanted as well as premature failure. Keeping these drawbacks in consideration, the present investigation attempts at analyzing erosive and wear characteristics of developed epoxy composites. The developed composites have been reinforced with glass fibers as primary reinforcement and silicon carbide particulates as secondary reinforcement. The erosion behavior of developed composites were analyzed at various process parameters such as impingement angles, slurry pressure, and standoff distance using natural sand particles as erodent. Wear characteristics of composites were analyzed on a pin on disk wear test apparatus at variable load, sliding velocity and abrasive surface. From the experimental results, a mathematical model has been developed to predict the expected life of developed composite against abrasive wear and solid particle erosion. The worn and eroded surfaces of composites were examined using scanning electron microscopy to explore the wear and erosion mechanism. Page(s): 122-130 Sun, 01 Apr 2018 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/44725 2018-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44724 Title: A parametric investigation on effects of friction stir welding process parameters on mechanical properties of AA6061-T6 to Cu dissimilar joints Authors: Pandya, Shailesh N; Menghani, J V Abstract: Joining of dissimilar materials is required in many engineering applications such as - power generation, transportation and electronics industries. Friction stir welding (FSW) is considered to be the most significant development in metal joining in last two and half decades. Friction stir welding is a solid-state welding technique involving low heat input and one of the most suitable process for joining dissimilar alloys. In friction stir welding of dissimilar metals, formation of brittle intermetallics may take place depending on peak temperature attained at the weld interface. Nature and form of these intermetallics affect dissimilar joint properties. Nature and dispersion of intermetallics can be altered by addition of suitable filler powder at weld interface. An experimental investigation has been carried out to investigate effects of FSW parameters on ultimate tensile strength (UTS) of dissimilar AA6061-T6 to pure copper joints prepared with tin filler powder. Experiments have been carried out in 11 run settings with one parameter at a time. 27% runs (3 runs) were repeated to check repeatability. Four process parameters: tool rotation speed (710, 1000 and 1400 rpm), tool travel speed (28 and 56 mm/min), tin filler powder amount by gap method (0.0, i.e., no filler, 0.05, 0.10, 0.15 mm) and tool pin axis offset at two levels (0 mm, i.e., no offset and +1.0 mm offset toward AA6061-T6 sheet) have been considered. Microstructure, microhardness testing and X-ray diffraction (XRD) analysis have been carried out. Results indicate that weld prepared with 0.05 mm tin filler powder gap resulted into optimum tensile properties which can be attributed to only Cu₃Sn intermetallic layer at the interface of the weld. Page(s): 131-146 Sun, 01 Apr 2018 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/44724 2018-04-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44723 Title: Mechanical properties and microstructural characterization of automated pulse TIG welding of dissimilar aluminum alloy Authors: Baghel, Pushp Kumar; Nagesh, D S Abstract: Tungsten inert gas (TIG) welding is commonly used welding process for joining aluminum alloys. Welding of aluminum and its alloys poses several problems to the designer as they are prone to hot cracking and porosity. To overcome this, a relatively new automated TIG welding with continuous wire feed arrangement is employed for joining two dissimilar aluminum alloy with pulse TIG welding. Trial runs were conducted on dissimilar aluminum alloy 5083 and 6061 plates of 6.35 mm. Radiography studies were done to check porosity and lack of penetration. The microstructure, mechanical properties and surface morphology at the fractured location of the weld joint were examined. The microstructural properties of base metal, heat affected zone and fusion zone were analyzed through optical microscopy. The welded joints show an ultimate tensile strength of 213 MPa, yield strength of 176 MPa and elongation of 12%. Energy dispersive spectroscopy was conducted to examine intermetallics composition in fusion zone while fractured surface was examined using scanning electron microscopy (SEM). SEM images show dimple type rupture present at the surfaces owing to insufficient or excessive heat with impurities that prevents the accomplishments of stronger micro-level weld integrity. Page(s): 147-154 Sun, 01 Apr 2018 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/44723 2018-04-01T00:00:00Z