Study on the relationship between intermediate-temperature embrittlement and triaxial stress induced by the ellipsoidal

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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, and L.H. C H E N 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 (tr,,/o'e~) at a point in the ferrite matrix center can be expressed in terms of graphite shape ratio (bd) and graphite interparticle spacing (2ad) as o',./O-

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