Details

Autor(en) / Beteiligte

• Kumar, P. Kishore
• Sai, N. Vijaya
• Krishna, A. Gopala

Titel

Effect of Y2O3 addition and cooling rate on mechanical properties of Fe-24Cr-20Ni-2Mn steels by powder metallurgy route

Ist Teil von

• Composites communications, 2018-12, Vol.10, p.116-121

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The effect of yttria (Y2O3) addition (0 Wt. %, 0.5 Wt. % and 1 Wt. %) on micro-structural changes and mechanical properties of Fe-24Cr-20Ni-2Mn steels were investigated by powder metallurgy (P/M) route. The consolidation process was conducted with different cooling rates (5 °C/min, 8 °C/min and 10 °C/min) to understand the precipitate formation. The powders were cold compacted at 650 MPa pressure and then sintered at 1200 °C for 1 hour under vacuum atmosphere. The structural changes of sintered pellets were examined by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The mechanical properties such as hardness (HV), tensile strength (MPa) and elongation (%) were measured at 28 °C and 300 °C. The addition of Y2O3 has a momentous effect on the mechanical properties of Fe-24Cr-20Ni-2Mn steels. The degree of precipitation varies with rate of cooling used during the sintering process. •Micro-structural studies of Fe-24Cr-20Ni-2Mn steel are carried out by OM, SEM and TEM/EDS.•The addition of Y2O3 increases the hardness of the Fe-24Cr-20Ni-2Mn steel from 98 HV to 289 HV.•1 Wt. % of Y2O3 composition exhibited highest tensile strength of 516 MPa at 28 °C and 456 MPa at 300 °C.•Ultra-fine Y2O3 addition and less GB precipitates are observed to enhance the elevated temperature strength of the Fe-24Cr-20Ni-2Mn steel.