On the Hall-Petch relationship and substructural evolution in type 316L stainless steel
- Indian Inst. of Tech., Bombay (India). Dept. of Metallurgical Engineering and Materials Science
- Univ. of Manitoba, Winnipeg, Manitoba (Canada). Metallurgical Sciences Labs.
Tensile specimens of Type 316L stainless steel having grain sizes in the range 3.1--86.7 {micro}m were deformed to 34% strain at temperatures 24,400 and 700 C and strain rate 1 {times} 10{sup {minus}4}s{sup {minus}1} to investigate the Hall-Petch (H-P) relationship, the nature of stress-strain curves and the substructure development. Up to {approximately}5% strain the H-P relationship exhibits bi-linearity whereas the single Hall-Petch relation is exhibited at larger strains. The presence of bi-linearity is explained by the back stress associated with the difference in the dislocation densities in the vicinity of grain boundary and in the grain interior. The log stress ({sigma})-log strain ({epsilon}) plots depict three regimes and follow the relationship {sigma}=K{epsilon}{sup n} in each regime, but with varying magnitudes of the strength coefficient (K) and strain-hardening exponent (n).
- OSTI ID:
- 131492
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 11 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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