Premium
Metal‐Matrix Materials for High‐Temperature Applications with Liquid Aluminum
Author(s) -
Weigelt Christian,
Brachhold Nora,
Eckner Ralf,
Krüger Lutz,
Hauser Michael,
Sauke Sven-Olaf,
Semrau Hubertus,
Aneziris Christos G.
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901321
Subject(s) - materials science , ultimate tensile strength , ceramic , microstructure , composite number , composite material , sintering , aluminium , spinel , metallurgy , yield (engineering)
Herein, powder metallurgically processed transformation‐induced plasticity effect (TRIP)‐steel‐matrix composites with additions of TiO 2 or Al 2 O 3 –TiO 2 are investigated for their potentional use as a impact pad in aluminum melting furnaces. The composites contain volume fractions of 10% or 30% ceramic particles dispersed in a CrMnNi‐steel matrix. The formation of ceramic precipitates in the steel and the interactions between the matrix and the ceramic particles during sintering influence the microstructure of the fired materials. TiO 2 promotes the formation of Mn–Ti–O spinel‐type structures whereas the Al 2 O 3 –TiO 2 material induces the additional formation of Ti–Mn–Al–O solid solutions but reduces the densification progress. Despite material changes, the steel matrix undergoes α'‐martensite formation during quasi‐static tensile loading at room temperature in the reference material and in the composite variants. The yield strength in the composite variant with 10 vol% TiO 2 increases by 28% (constant with 10 vol% Al 2 O 3 –TiO 2 ), whereby the ultimate tensile strength and the fracture strain are lower for all composite variants as compared to the pure steel. The yield strength of the materials after immersion test in liquid aluminum at 800 °C is +80% (10% TiO 2 ) or +29% (10% Al 2 O 3 –TiO 2 ) as compared to the corroded steel material.