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Report No.

Residual stresses in steel rod with collar formed by partial diameter-enlarging technique

Fukuda, Kojiro*; Tomota, Yo*; Harjo, S.; Gong, W.*; Woo, W.*; Seong, B. S.*; Kuwahara, Yoshitaka*; Ikuta, Fumiaki*

Residual stress distribution in a carbon steel component with collar manufactured by partial diameter-enlarging (PDE) process was evaluated using the angular dispersion and time-of-flight neutron diffraction methods in the interior and X-ray diffraction method at the surface of the collar. The residual stresses in the PDE specimen were smaller compared with those of a specimen with the similar shape and dimension made by a simple compression (SC) process. The hoop residual stress varied from -98 to 2 MPa around the circumference at the surface of the collar in the PDE specimen, whereas it was nearly constant in the SC one. The residual stresses in the central region of the both specimens were nearly in a hydrostatic compressive stress condition.



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