Relation between the Hardness and the Strength of Gray Cast Iron with Allowance for the Structural Parameters

Resumo

The factors that affect the relation between ultimate tensile strength σ_u and hardness HB of gray cast iron with flaked graphite are studied. The scatter of the ultimate tensile strengths at a given hardness is shown to be caused by one of the primary structure parameters, namely, the volume fraction of primary austenite dendritic crystals. The dependences derived in this work can be used to increase the accuracy of a rapid estimation of the quality of cast iron ingots.