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Investigations on Oxide Particles Formed during Sintering of CrMnNi‐Transformation‐Induced Plasticity (TRIP) Steel Powder Metallurgically Materials Using Automatic Feature Analysis
Author(s) -
Weigelt Christian,
Kerber Florian,
Baumgart Christine,
Krüger Lutz,
Aneziris Christos G.
Publication year - 2021
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.202001215
Subject(s) - materials science , sintering , ceramic , metallurgy , oxide , metal powder , powder metallurgy , scanning electron microscope , extrusion , hydrogen , energy dispersive x ray spectroscopy , metal , composite material , chemistry , organic chemistry
The combination of powder metallurgical and ceramics‐derived processing enables the manufacturing of innovative metal components. Using high‐alloyed transformation‐induced plasticity (TRIP) steels facilitates the manufacturing of metal components with outstanding mechanical properties for advanced load applications. The oxygen affinity of some alloying elements promotes the formation of non‐metallic particles during sintering, which deteriorate the mechanical properties. Bulk specimens are prepared from a 17Cr7Mn6Ni‐TRIP steel powder using a ceramics‐derived extrusion process with organic binders at ambient temperature. Processing comprises the thermal binder removal in air and the sintering in pure argon or hydrogen atmospheres. The sintered specimens are analyzed for their amount and composition of non‐metallic particles using scanning electron microscopy (SEM) and energy‐dispersive spectroscopy (EDS). The focus of this article is on the automated particle identification and analysis using an automatic SEM‐EDS‐related device. The automatic feature analysis provides statistical information on the chemistry, size, and morphology. The particles mainly consist of Cr, Mn, Si, and O forming Mn 2 SiO 4 and MnCr 2 O 4 . The number of particles mainly depends on the debinding temperature and on the sintering atmosphere. The use of a pure hydrogen sintering atmosphere significantly depresses the formation of MnCr 2 O 4 , whereas silicates remain stable under the applied atmospheric and thermal conditions.