In Situ Spark Plasma Sintering, Microstructure and Mechanical Properties of Fe-15Cr-2Mn-1.5Al Matrix Composites Reinforced with TiB2 and CrFeB

Authors：Liu, Jian^*; Wu, Min^*; Wang, Bin; Xu, Wei; Chen, Weiping; Liu, Fangfang

Source：JOM, 2023, 75(3): 886-894.

DOI：10.1007/s11837-022-05683-5

• CORROSION BEHAVIOR
• FRACTURE-TOUGHNESS
• FE
• TITANIUM
• HARDNESS
• STEELS
• CR
• MN
• ADDITIONS

Fe-15Cr-2Mn-1.5Al metal matrix composites (MMCs) reinforced with TiB2 and CrFeB were synthesized from a Fe, Cr, Mn, Al, Ti, and B powder mixture at 1100 degrees C and 50 MPa for 15 min using an in situ spark plasma sintering (SPS) method. A mechanical alloying process was used to improve the activity and uniformity of the composite powder. The reinforced phase and matrix were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The mechanical properties of the steel-based MMCs were also measured by compression and microhardness. The results showed that the in situ synthesized reinforcements of steel-based MMCs were Cr-rich M2B-type boride (CrFeB) and TiB2, and the matrixes were alpha-Fe. CrFeB addition improved the plastic deformation capacity and weakened the compressive strength as well as the hardness. The plastic deformation capacity of the (15 vol.% M2B + 10 vol.% TiB2)/Fe-15Cr-2Mn-1.5Al composite equaled similar to 14.3%, which was almost double that of the TiB2/Fe-15Cr-2Mn-1.5Al composite (similar to 7.5%). The compressive strength and hardness of the TiB2/Fe-15Cr-2Mn-1.5Al composite equaled similar to 2971 MPa and 781 +/- 15 HV, respectively, while the compressive strength and hardness of the (15 vol.% M2B + 10 vol.% TiB2)/Fe-15Cr-2Mn-1.5Al composite equaled similar to 2576 MPa and 659 +/- 15 HV, respectively.

• Institution
  广东技术师范学院