It was described in the first report that the attenuation of ultrasonic waves in steel was influenced extraordinarily by thermal stresses. In this report the change of ultrasonic attenuation by the tensile stress on tension test is studied. Pulsed waves of 3 megacycles were used under reflection method and 0.21∼0.26%C-steel and 25-20 stainless steel for the measurements. The results are summarized as follows: (1)The attenuation curve by tensile stress corresponds to the stress-strain diagram but the change is very small. (2) There seems to be a little decrease in the attenuation in ferritic steel but no effect on 25-20 stainless steel due to the tensile stress within the elastic limit. (3) The attenuation in plastic deformed steels increases by tensile stress. (4)The same phenomena are observed in the direction and at right angle to the principal stress.
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