EFFECT OF HEAT TREATMENT ON RESIDUAL STRESS PROFILES OF PULSE-PLATED CRACK-FREE Cr LAYER , Y. Kobayashi, J. Nagasawa, K. Watanabe, K. Nakamura, T. Sasaki, Y. Hirose, pp. 280-285

The residual stresses of crack-free Cr layers deposited on a steel substrate by pulse current electrolysis were evaluated by X-ray diffraction methods. Changing the pulse conditions, various residual stresses were measured. The residual stress of the Cr layer changed toward to tensile following heat treatment, and macro cracks were formed in the Cr layer when the residual stress exceeded 80MPa in the tension after heat treatment. The specimens in which the initial compressive residual stress of the Cr layer exceeded -200MPa did not form macro cracks after being held at 673K for 2h. The amount of change in the residual stress due to heat treatment correlated with the half value breadth of the diffracted X-rays, and became smaller and more stable with heat treatment as the half value breadth became narrower.