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Maity, S. K.
- Application of Electrical Resistivity and Induced Polarisation Methods a for Detection of Fluoride Contaminated Groundwater
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Authors
Affiliations
1 Geological Survey of India, CR, Nagpur 440 006, IN
2 Geological Survey of India, ER, Kolkata 700 091, IN
1 Geological Survey of India, CR, Nagpur 440 006, IN
2 Geological Survey of India, ER, Kolkata 700 091, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 2 (2007), Pagination: 381-389Abstract
State Water Investigation Directorate (SWID), Government of West Bengal had drilled several boreholes in the Nalhati-Nashipur area (87°42' E to 87°54' E longitude and 24°15' N to 24°26' N latitude) in the district of Birbhum for development of potable ground water in the region. Quaternary sedments overlying the Rajmahal Trap, including the weathered/vesicular traps form the potential aquifers in these areas. Ground water samples from deeper aquifers at a few locations show high fluoride concentration in the area.
Resistivity and Induced Potarisation survey have been carried out in the area to demarcate the zones where contaminated ground water may exist. This paper aims to highlight the utility of the above surveys, using chemical analysis of data as constraints, in successful delineation of such contaminated /polluted ground water zones. In order to check the spread of Osteo-Fluorosis in the region ground water from such areas may be avoided for drinking purpose.Keywords
Groundwater, Contamination, Electrical Resistivity, Fluoride, West Bengal.
- Development of 0.2C-CrMnMoV Ultra High Strength Steel
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The remaining part of the ingot was further processed by the thermomechanical treatment. The ingots were rolled in two passes, initially at 950°C and subsequently at 850°C followed by immediate cooling in oil. The TMT plates of the base alloy confirmed the tensile strength of 1755 MPa, yield strength in excess of 1460 MPa and impact strength of 9.1J. The titanium added TMT plate displayed tensile strength of 1860 MPa, yield strength of 1580 MPa and impact strength of 10.1J. Microstructures of titanium added alloy consisted finer lath martensite and precipitates of titanium carbides/carbonitrides. It was observed that the addition of titanium significantly improved the mechanical properties of 0.2C-Cr Mn Mo V alloys and the mechanical properties were also improved significantly by thermomechanical treatment.
Authors
Affiliations
1 Metal Extraction and Forming, CSIR-National Metallurgical Laboratory, Jamshedpur, IN
2 Dept. of Metallurgical Engineering, BIT, Sindhri, IN
1 Metal Extraction and Forming, CSIR-National Metallurgical Laboratory, Jamshedpur, IN
2 Dept. of Metallurgical Engineering, BIT, Sindhri, IN
Source
International Journal of Scientific Engineering and Technology, Vol 3, No 2 (2014), Pagination: 101-108Abstract
A study was carried out to develop a low alloy ultra high strength steel by induction melting and thermomechanical treatment (TMT) containing alloying elements like carbon, manganese, molybdenum, chromium and vanadium. A base alloy was prepared with 0.24%C, 1.16% Mn, 0.23% Si, 5.61% Cr, 0.42%V, 1.01% Mo, 0.026%S and 0.032%P. It showed tensile strength of 1467 MPa, yield strength of about 1180 MPa, impact strength of 6.3J and elongation of 5.9% in as-tempered condition. Other alloy was prepared by addition of 0.054% titanium with the base composition. It displayed tensile strength, yield strength, impact toughness and % elongation of 1615 MPa, 1240 MPa, 8.2J and 6.15%, respectively. The optical, SEM and TEM microstructures confirmed that the base alloy and the titanium alloy consisted with tempered lath martensites.The remaining part of the ingot was further processed by the thermomechanical treatment. The ingots were rolled in two passes, initially at 950°C and subsequently at 850°C followed by immediate cooling in oil. The TMT plates of the base alloy confirmed the tensile strength of 1755 MPa, yield strength in excess of 1460 MPa and impact strength of 9.1J. The titanium added TMT plate displayed tensile strength of 1860 MPa, yield strength of 1580 MPa and impact strength of 10.1J. Microstructures of titanium added alloy consisted finer lath martensite and precipitates of titanium carbides/carbonitrides. It was observed that the addition of titanium significantly improved the mechanical properties of 0.2C-Cr Mn Mo V alloys and the mechanical properties were also improved significantly by thermomechanical treatment.
Keywords
Ultra High Strength Steel, Thermomechanical Treatment, Mechanical Properties, Microstructure.Full Text