Study on the relationship between intermediate-temperature embrittlement and triaxial stress induced by the ellipsoidal graphite in hot-rolled ferritic spheroidal graphite cast iron

Y. F. Lin, T. S. Lui, L. H. Chen

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The intermediate-temperature embrittlement of a hot-rolled ferritic spheroidal graphite cast iron was studied with the consideration that triaxial stress is induced by the ellipsoidal graphite particles of three unequal axial radii. The graphite shape was changed by various rolling reductions, and the tensile tests were performed at 673 K. The results show that the elongation and flow stress are independent of rolling reduction, and intergranular fracture occurs in all specimens. In the plasticity analysis, the triaxiality ratio (σ m σeq) at a point in the ferrite matrix center can be expressed in terms of graphite shape ratio (b d ) and graphite interparticle spacing (2 a d ) as σ meq = 1/3 +a d /(2 b d ) where σ m is the hydrostatic tensile stress and σeq is the equivalent stress. Accordingly, the average triaxiality ratio in the matrix center region is independent of rolling reduction and greater than one, a result that is consistent with the fact that the elongation is about constant, and all specimens undergo intergranular fracture. Moreover, the rolling reduction independent flow-stress behavior can be rationalized by the analytical result that the average σ meq is unchanged with rolling reduction, where σ z is the internal stress along the tensile direction.

Original languageEnglish
Pages (from-to)1101-1106
Number of pages6
JournalMetallurgical and Materials Transactions A
Volume26
Issue number5
DOIs
Publication statusPublished - 1995 May 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Study on the relationship between intermediate-temperature embrittlement and triaxial stress induced by the ellipsoidal graphite in hot-rolled ferritic spheroidal graphite cast iron'. Together they form a unique fingerprint.

Cite this