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InterviewSolution
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While Normal Carburizing And Nit Riding Surface Treatments Increase Fatigue Strength, Excessive Treatment May Decrease The Fatigue Strength. Why? |
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Answer» Normal carburizes/nits riding treatments increases VOLUME due to phase transformation at the surface and introduce residual compressive surface stress and thus increases fatigue strength. By excessive treatment, the high compressive stresses ae introduced but these are balanced by high internal ELASTIC stresses of equal value, and the surface fatigue cracks MAY DEVELOP in the regions of the high tensile stress and LEAD o early fatigue failure. Normal carburizes/nits riding treatments increases volume due to phase transformation at the surface and introduce residual compressive surface stress and thus increases fatigue strength. By excessive treatment, the high compressive stresses ae introduced but these are balanced by high internal elastic stresses of equal value, and the surface fatigue cracks may develop in the regions of the high tensile stress and lead o early fatigue failure. |
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