2 results listed
In this work, the effect of graphite content on the
microstructures and tensile behaviors of Mo added powder
metallurgy (PM) steels were investigated. The samples pressed
at 700 MPa and sintered at 1400°C temperature in the argon
atmosphere for 1 h were produced. Mo added PM microalloyed
steels with different graphite ratio were analyzed in terms of
microstructure and tensile test. Results indicated that as the
amount of the graphite in the PM steels increases, the volume
fraction of the pearlite increases gradually. Mo aded PM steel
contained 0.6 wt. % graphite showed the highest values in yield
strength (YS) and ultimate tensile strength (UTS).
International Iron & Steel Symposium
UDCS
Mehmet Akif Erden
Hasan Karabulut
Süleyman GÜNDÜZ
Dynamic 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.
International Iron & Steel Symposium
UDCS
Demet TASTEMÜR
Süleyman GÜNDÜZ