Service Failures of Engineering Metal Components

Machines of conventional design often suffer serious service failures. Various contributory factors thereto have been examined in this short paper such as unsuitable choice of materials,faulty melting and processing history, faulty heat-treatment, poor machining and surface finish,
careless handling and last but not the least the damaging effects of stress-raisers , notches etc., in relation to fatigue failure of metals.
The paper is illustrated with brief accounts of some typical service failures investigated in the two year's old National Metallurgical Laboratory