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Boriding of Low Carbon and Medium Carbon Steels for B.E. Project: Boriding process transforms the surface of material into a boride layer with unsurpassed metallurgical integrity revealing continuous and adherent interface during metallographic studies. It is due to rapid diffusion of boron along crystallographic c-axis. The saw-toothed interface results in excellent adherence to coating. The process produces hard surface without recourse to quenching. It can be selectively applied to area requiring hardening. Boride coatings of metallic materials are of technological importance, because of their high hardness and good wear resistance properties. At the same time they possess high oxidation stability in gaseous and liquid reactive media, offering great potential for protective coating under severe wear, erosion and corrosion. Boriding finds application at elevated temperatures and under non-oxidising conditions. Boriding improves life of hot working tools by three to four times whereas cold working tools appreciate it to eight to ten times! Boriding improves resistance to acids, hydrochloric acid in particular. To fully utilise the potential, new applications will soon target boriding. Problem Definition for M.Tech. Project under "DAAD scholarship" In weldments with local varying material properties, (mainly strength and toughness properties, i.e., 'mismatch'), plastification and thus development of plastic zones is strongly influenced by the relation of the individual material properties. If a crack is located in such a weldment, its behaviour under loading also depends on the mismatch ratio. It is not yet sufficiently clear, how the behaviour of a specimen or component with a crack in a highly mismatched weld can be predicted by means of the base metal properties using fracture mechanics approach. Finite Element Modelling was used on the platform of PATRAN using ABAQUS software. M.S. at University of Kentucky under RCTF Fellowship: Impression Creep testing through RSA III (Rheometrics Solids Analyser) provides creep data on a single specimen, hence avoiding sample to sample varioations. Moreover the sample preparation load is minimized and more time can be concentrated on providing useful data and correlating it to material properties. Activatrion energy and strain-rate exponents were calculated for the temperature range of 298 - 393 K under various Stresses. Also the effect of punch diameter was also studied which depicted a linear relation with steady-state creep rate. Hence the effects of varying punch diameters could be predicted. As expected, Increasing Stress and Decreasing Temperature show a decrease in activation shear volume of 90 Pb-10 Sn Alloy. |
| Publications: 1. Kantesh Balani, and F.Yang. "Impression Creep of 90 Pb-10 Sn Alloy". Physica Status Solidi, 198 (2003) pp 387-394. Paper Presentations: 1. Diffusion Studies in Boriding R.E.C.Trichy, Feb.23-24th, 1999 METTLE-'99 (A National Level Technical Event) 1st Prize 2. A New Look: Interrupted Boriding A.U.,Visakhapatnam, Feb 25-26, 2000 COSMET-2000 (A National Level Technical Event) 1st Prize 3. Process Optimisation for the Production of Crystalline Boron-Nitride Powder through Carbothermal Reduction Route J.N.T.U., Anantpur, April 17, 2000 FUSION 2000 (A National Level Technical Event) 1st Prize 4. Impression Creep of 90 Pb- 10 Sn Alloy Amalgam, IIT Madras (A National Level technical Symposium) 1st Prize Training Details: 1. P.S.G. College of Technology, Coimbatore (2 Semesters) Machine Shop, Foundry. 2. P.S.G. Neelambur Foundry Division, Coimbatore (3 Semesters) Manufacture of S.G. Iron, Spectrovac, Sand Testing. 3. Shah Alloys Limited, Ahmedabad (2 Weeks) Induction Furnace, AOC, Continuous Casting. 4. Bhabha Atomic Research Centre, Bombay (6 Weeks) Bimetallic Welding, BARC MADAM Software. |
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