低滿俺鋼の機械的性質に關する研究

抄録

The auther deals, in this article, with the mechanical properties of 21 low manganese steels varying in composition from 0·1 to 0·4% of carbon and from 0·4 to 5% of manganese.
After examining the microstructure of fully annealed samples a so called structural diagram is advanced which much differs from the Guiellt's diagram.
Good properties in static tests are gained with the sorbitic structure, while the dynamic test i.e. the notched bar impact test at low and high temperatures shows also maximum toughness with steels containing 1 to 2% of Mn, which are sorbitic.
From both mechanical tests the best composition for so called Ducol Steel is raised.
The auther also explains the cold-brittleness and the blue shortness of steel by the newly introduced relationship between maximum normal resistance and maximum slip resistance on the gliding planes of a crystal.