抄録
Some residua stress versus depth curves of heat treated steels are smooth while the others show minimum poiuus. the occurrence of the minimum pint in the curve is attributed to the unequal temperature of the Ary, Ar' or Ar'' transformation in the specimen when its dimenxious is large, or when its composition is not uniform by decarburizationr or carburization. The minimum point moves toward the center or surface of the specimen according to the carbon concentration or the treatment. These facts are shown in this report.
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