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Title: The Influence of Grain Size on the Mechanical Properties of Steel

Many of the important mechanical properties of steel, including yield strength and hardness, the ductile-brittle transition temperature and susceptibility to environmental embrittlement can be improved by refining the grain size. The improvement can often be quantified in a constitutive relation that is an appropriate variant on the familiar Hall-Petch relation: the quantitative improvement in properties varies with d-1/2, where d is the grain size. Nonetheless, there is considerable uncertainty regarding the detailed mechanism of the grain size effect, and appropriate definition of “grain size”. Each particular mechanism of strengthening and fracture suggests its own appropriate definition of the “effective grain size”, and how it may be best controlled.
Authors:
 [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Advanced Materials; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
861397
Report Number(s):
LBNL--47875
R&D Project: 511201; TRN: US200601%%845
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DUCTILE-BRITTLE TRANSITIONS; EMBRITTLEMENT; FRACTURES; GRAIN SIZE; HARDNESS; MECHANICAL PROPERTIES; REFINING; STEELS; YIELD STRENGTH grain refinement; Hall-Petch relation; steel; strength; toughness; brittle transition