Asei Tsutsui and Takao Furumoto
Immediately following our 2nd report, the effects of specimen size on the circular test piece under a set treat condition(effective depth of carburizing 0.5 mm, quenched from 845° in oil)was observed by using SCM 21. In other words,the thermal,the transformation and the elasticity effects etc. on the residual stress caused by variation in the length of the circular test piece and the outer and inner diameter of disk-and annular shaped test pieces were observed. The results of this observation revealed that the maximum stress value of a solid and hollow cylinder decreased with the decrease of the length of the said cylinder. Also, the maximum stress value of disk-and annular shaped test pieces increased with increase of its outer diameter and the said value increased where the diameter of the test piece with a constant ratio(0.5) of the inner to the outer diameter increased. Further, the findings revealed the tendency of the maximum stress value to decrease when only the inner diameter increased.
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