Strain hardening behaviour in forming of sintered iron-0.35% carbon powder metallurgy preform during cold upsetting

Materials Research

Sumesh Narayan¹  Ananthanarayanan Rajeshkannan¹ 

[1] ,The University of the South Pacific Faculty of Science, Technology & Environment School of Engineering and PhysicsFiji

关键词: strain hardening exponent;    density hardening exponent;    strength coefficient;    densification;   

DOI  :  10.1590/S1516-14392011005000074

来源: SciELO

【 摘 要 】

A complete experimental investigation on the instantaneous strain-hardening behaviour of powder metallurgy preforms of Fe-0.35%C was carried out. The strain hardening behaviour of the above-mentioned P/M sintered steel preforms with aspect ratio of 0.4 and 0.6, respectively, under triaxial stress state condition was determined by cold upsetting under nil/no and graphite lubricant conditions. The instantaneous strain hardening value (n i), strength coefficient (Ki), and the stress as a function of strain and densification were obtained and analyzed. Further, a relation is obtained from a semi-log plot of stress against relative density. This was analyzed to study the hardening behaviour due to the densification as applied stress is a function of induced strain as well as of densification in the powder metallurgy materials.

【 授权许可】

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