Abstract
Specific features of plastic deformation and tensile failure of a spring steel with systematically various pearlite fineness obtained by isothermal transformation have been investigated by uniaxial tensile tests and electron microscopes. The results indicated that pearlite interlamellar spacing has an important influence on that. The tensile fracture surface is consisted of the center plastic fracture region and the edge brittle fracture region while the interlamellar spacing is within the range 140-280nm, and is a completely brittle fracture and no necking with the further increase in interlamellar spacing to 510 nm. The deformation characteristics of pearlite in the neck regions is mainly including S-shape bend, rotation and shearing. And the data obtained suggest that the interlamellar spacing within 140-280nm can ensure the plasticity for the steel.
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