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- 저자 : Durbadal Mandal (검색결과 2 건)
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Alok Srivastava,Ashok Kamaraj,Durbadal Mandal,K. Mondal,Gopi K. Mandal 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
The present work discusses the evolution of microstructure and non-metallic inclusions during wire drawing process in asynthetic slag-treated 5.5 mm diameter high carbon wire rod steel. It has been observed that failure of the as-received wirerod (without synthetic slag treatment) takes place at different stages of deformation during wire drawing operation. However,in case of the synthetic slag-treated wire rods (TW specimen), failure takes place consistently at ~ 95% reduction in thecross-sectional area of the wire. In a quest to understand the failure mechanisms during wire drawing process, a systematicstudy has been carried out by analyzing the microstructures and non-metallic inclusions in the steel wires drawn at variousstages of deformation. The improved drawability of the treated wire specimens is attributed to the decrease in the amountof unfavourable non-deformable inclusions in the steel matrix, and this stems from the synthetic slag treatment of the liquidsteel. Microstructural investigation also confirms the complete realignment of pearlite colonies along the wire drawingdirection followed by thinning and disintegration of cementite lamellae at higher deformation, particularly in case of thesynthetic slag-treated wire rod steel.
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Chandan Choudhary,H. N. Bar,A. K. Pramanick,K. L. Sahoo,Durbadal Mandal 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10
In this study, simultaneous effects of modified strain induced melt activation (M-SIMA) process and addition of Al-5Ti-1Bchemical grain refiner on the casting defects, microstructural features, and mechanical properties of hypoeutectic Al-7Sialloys are investigated. The traditional melting and casting techniques were used to develop cast ingots of unrefined andgrain refined structures of Al-7Si alloy. Addition of chemical refiner Al-5Ti-1B to Al-7Si melt could significantly changethe secondary dendritic arm spacing and eutectic Si particle size to 31% and 28%, respectively. In the M-SIMA process, castingots were 60% warm deformed and heat-treated at mushy zone at temperature 585 °C for 30 min. Spherical morphology ofα-Al grain and fine fibrous type eutectic Si are observed after M-SIMA process. Grain size of α-Al and eutectic Si are furtherreduced to 56% and 40% after M-SIMA process of grain refined Al-7Si alloy. Porosity and micro-cracks are also minimizedafter M-SIMA process. Microstructural features of cast and M-SIMA processed alloys were characterized through opticaland scanning electron microscopy. X-ray diffraction techniques reveal the different phases present in the developed alloy. TEM analysis further confirms the presence of TiAl3and Ti7Al5Si14precipitates in grain refined Al-7Si alloy. A significantimprovement of 132% in hardness (HV), 76% in yield strength, 120% in ultimate tensile strength, 125% in elongation tofracture, and 116% in specific ultimate tensile strength are obtained in M-SIMA processed grain refined Al-7Si alloy. Fractographyanalysis reveals the mixed mode of fracture in M-SIMA processed Al-7Si alloy with refined structure comparedto brittle fracture of unrefined cast alloy.
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