Method for manufacturing reference piece for x-ray measurement of residual stress and reference piece for x-ray measurement of residual stress
AssigneeSintokogio, Ltd.
InventorsYuji Kobayashi, Akinori Matsui, Yuta Saito
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Abstract
A metal material other than strain-free iron powder can be used as a reference piece for X-ray measurement of residual stress. The metal material is manufactured by nanocrystallizing at least a portion of a surface of a metal material, and then removing inherent strain by annealing the metal material, thereby eliminating stress.
Claims10
A manufacturing method for a reference piece for X-ray measurement of residual stress, comprising, after at least a portion of a surface of SCM (steel chromium molybdenum steel materials), SUP (spring steel steel materials), SPCC (normal steel), SPHC (general hot rolled steel materials), or S10C (carbon steel for machine structures) has been nanocrystallized by shot peening, stress is reduced while maintaining a micro state of nanocrystallized crystal grains by annealing the same and an orientation of metal crystal planes facing in the same direction generated by the manufacturing method is scattered by recrystallizing/micronizing the same by shot peening,
- wherein the residual stress in the reference piece for X-ray measurement of residual stress is −55 MPa or greater and 55 MPa or less, and
- wherein the shot peening is implemented with an air acceleration device with a projection air pressure in a range of 0.05-1.0 MPa.
Dependencies are inferred from the claim text.