X-ray Investigation on the Change of Surface internal stress depend on the Heating in Twisting work material.

The change of microscopic surface internal stress depend on the passage of time and high vacuum annealing in Twisting work materials were studied by the X-ray. The following results were obtained from the experiment. (1) Immediately load off, the round bar specimen which was subjected a twisting deformation have a compressive internal stress together with a Longitudinal direction or a Tangential direction in the surface of specimen. (2) The recovery of surface internal stress finished about 48 times, get to a stable condition together with a 0.2% carbon steel (S20C), or a high tensile aluminum alloy (17S) and a electrolytic copper (CuB-1). (3) In the neighbourhood of the recrystallization temperature of each materials, the surface internal stress and the value of half breadth were exibited the heaty decrease. The surface internal stress point out a remarkable decrease, according to the twisting deformation become larger. (4) In a 0.2% carbon steel (S20C), (211) diffraction line tend to separetes K_ and K_ at between 350℃ and 450℃. In a high tensile aluminum alloy (17S), (333) diffraction line separetes K_ and K_, at 250℃, it seems that the recrystallization occuring at these temperature