The influence of residual austenite on the mechanical properties and wear characteristics of austempering ductile iron with spherical graphite

Abstract

The influence of isothermal quenching condition on the strain induces phase transformation in austempering ductile iron was investigated. Under the optimal isothermal quenching condition the twenty presents of austenite was transformed to martensite. Phase transformation lead to increase of strain hardening rate under compration. In this case wear resistance more parameters more then three time higher then for other heat treatment. The effect is explained by formation during shift deformation of subsurface wear layer with high hardness and low ability to crack formation. Full text download