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Abstract
Low-temperature tensile tests on plain specimens of an iron–0·02% carbon alloy containing carbide particles of different size and distribution have indicated that microcrack formation resulting from ferrite cleavage is easier when large second-phase particles are present. Scanning electron-microscope observations have shown that the excellent fracture-resistance of material in the quench-aged condition is due to the difficulty of cracking small intra granular carbide particles and also of extending cracks in small particles into the ferrite matrix.