鋼の残留応力分布に及ぼす焼入組織の影響

概要

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The residual stress in heat treated steels was noticeably affected by the hardenability of steels. The materials used in the experiment were plain carbon steels containing 0.22% carbon and 0.69%, and Ni-Cr low alloy steel. These steels show different transformation behavior, respectively. Test specimens of which diameters are 5 to 100 mm were quenched in oil from the optimum hardening temperature. Residual stresses were determined by sin^2ψ method, using Cr-Kα radiation. An analysis of line profile on the surface of heat treated steels was investigated by X-ray diffraction method, using Co-Kα radiation. The experimental results are as follows: (1) In S20C with large mass effect, the residual stress distribution shows the thermal stress type. (2) The surface residual stress of SK7 and SNCl is affected by its diameter. The specimen of large diameter shows compressive, while the small one is tensile, therefore 15-20 mm dia. bar of SK7 and 30-35 mm dia. bar of SNCl don't show any stresses. (3) Microstrain and particle size in hardened structure are affected by more interstitial carbon than substitutional alloy elements.
社団法人日本材料学会の論文
1974-01-15