Impact, Tensile and Hardness Tests of Some Ferrous Alloys at Low Temperatures

概要

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Charpy impact tests were carried out with respect to four kinds of steels, i.e., low carbon steel, soft steel, chrome-molybdenum steel and chrome-mangmese austenitic steel at the temperature range between 20° and-195° The notched specimens, having the standard Charpy type, were made either from the part that was welded by means of an electric-are method. using welding rods of the same composition as the material to be welded, or from the unwelded part of the said steel plates; in the former case the position of the long edge of the specimen perpendicular to the welded line. The specimens were finished in the desired form of the complete specimen by means of a grinding machine after a suitable heat treatment of quenching and tempering. Among the four kinds of steels cited above, chromemanganese, steel of austenitic structure showed the largest impact value down to the liquid-air temperature, under both welded and unwelded conditions. Tensile tests were also performed to the aforesaid steels, with the specimens 6mm in diameter, in the said temperature range. Brinell hardness was also measured on the part of welding as well as on both sides of that part.
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