Investigation of dynamic strain aging properties of hot work tool steel
Demet TASTEMÜR Süleyman GÜNDÜZ
AbstractDynamic strain aging behaviour of hot work tool steel (H10) was investigated under as received conditions. Hot tensile testing was carried out at temperatures ranging from room temperature (RT) to 700 ˚C at a strain rate of 10-3s-1. The microstructure of the specimens was analyzed in detail by using optical microscopy and scanning electron microscopy (SEM). The results indicated that mechanical properties of H10 tool steel depends on test temperature. Tensile strength and yield strength showed slight decrease with increasing testing temperature to 4000C. Above 4000C these properties become so poor. It was also observed that as the testing temperature increased to 4000C a continuous decrease in elongation was noticed. Further increase in the testing temperature of 500, 600 or 7000C has increased the elongation. It is believed that dynamic strain ageing and high temperature mechanical properties are affected by interaction between dislocation and precipitate particles such as MC (VC), M6C (Mo6C) and M23C6 (Cr23C6) or solute atoms.