軟鋼の降伏點發生機構

概要

論文の詳細を見る
A hypothesis is proposed for the yield point phenomena of soft steel. When an annealed soft steel is subjected to mechanical stress, it reveals a palier in the stress-strain diagram as well as Luders' lines on the surface of steel. These phenomena are particular for only annealed soft steel, and almost all other alloys and metals do not show them. The author seeked the cause of the phenomena in the special structure of the soft steel, which is composed of soft ferrite and hard pearlite or cementite. A little amount of cementite segregates out along the boundary of the ferrite crystallines and forms honey-comb-work of hard boundary structure. When such structure is subjected to heavy load, the boundary strncture yields at first, so the thick mass of soft ferrite strains suddenly until it can sustain the same amount of stress. This transition of stress appears as the palier in the stress-strain diagram, and the trace of the destruction of the honey comb structure forms the Luders' lines on the surface of the steel. The author explains this hypothesis from different directions of the characters of soft steel.
社団法人日本鉄鋼協会の論文
1941-04-25