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Abstract
A study of the fatigue-crack growth rate of a commercial forging die steel has shown that high temperatures and oil- and water-based lubricants all increase the rate of crack propagation. However, specific boron-containing lubricant additives can almost totally counteract any detrimental effect. A commercial borate ester additive was found to be effective in oil-based lubricants, whereas phenyl boronic acid was effective in water-bared lubricants.