Pressure effect on the structural, magnetic and thermophysical properties of X12Cr13 martensitic stainless steel prepared by powder metallurgy method. (December 2022)

• Record Type: Journal Article
• Authors: Acar, Ayşe Nur; Kaya, Dogan; Ekşi, Abdul Kadir; Ekicibil, Ahmet
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Martensitic stainless steel -- Powder metallurgy -- Magnetization -- Thermophysical -- Phase transition -- Susceptibility; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104924
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Low carbon (C: 0.03–0.15%) and high Cr contents (Cr: 11–15%) martensitic stainless steel (MSS) is widely used for industrial applications due to its good mechanical properties and corrosion resistance. In this study, we investigated the pressure effect on the structural, magnetic and thermophysical properties of X12Cr13 MSS which was compacted using powder metallurgy method under 400 and 600 MPa pressures and sintered at 1200 °C temperature for an hour under Ar atmosphere. Pressing and sintering processes resulted in increased density of microstructures from 5.84 g/cm 3 to 6.12 g/cm 3, decreased porosity from 7.58% to 3.39%, increased hardness from 93.24 HB to 110.09 HB (N/ mm 2 ) and decreased carbide particles from 2.65% to 2.13 wt% in the structures. We observed α -Fe, γ -Fe and M23 C6 (M: Cr or Fe) phase formations in the structure due to the applied pressure and the sintering process. The magnetic properties of these steels have been investigated as a function of temperature between 300 and 400 K and applied magnetic field of ± 4 T. We observed improved magnetic properties with increasing pressure, and ferromagnetic to paramagnetic phase transition occurred from 300 K to 400 K. While maximum saturation magnetization is found to be 70 emu/g at 300 K for 600 MPa sample, maximum magnetic susceptibility and permeability for 600 MPa sintered sample are recorded as 17.13 and 1.08 m 3 /kg, respectively. Also, the maximum specific heat capacity and enthalpy are recorded as 1.85 J/g °C and 536.05 J/g (at 579 °C temperature) on the sample compacted on the 600 MPa pressure, respectively. Graphical Abstract: ga1 Highlights: X12Cr13 MSS samples were prepared by P/M method at 400 MPa and 600 MPa. 600 MPa pressing and 1200 °C sintering enhanced physical and magnetic properties. MSS prepared at 600 MPa exhibits 110.09 HB hardness and 6.12 g/cm 3 density. The maximum saturation magnetization found to be 70 emu/g at RT for 600 MPa sample. The 600 MPa sample provided 536.0 J/g heat storage capacity at 579 °C.