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Fig. 2. Variation in internal stress, tensile strength, ductility, and hardness with pH. Watts bath 54° C (130° F) and 495 A/m2 (46 A/ft2 ). nal stress of the deposits. Lowering the internal stress of the deposits lowers the degree of reduction in fatigue life; compressively stressed nickel deposits are ben- eficial. Fatigue life is enhanced by increasing the hardness and strength of the steel and by specifying the minimum deposit thickness consistent with design criteria. Fig. 3. Variation in internal stress and hardness with current density. Watts bath 54O (130O F) and pH 3. 228 C