Liquid Phase Sintering of Highly Alloyed Stainless Steel

Troels Mathiesen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

    Abstract

    Liquid phase sintering of stainless steel is usually applied to improve corrosion resistance by obtaining a material without an open pore system. The dense structure normally also give a higher strength when compared to conventional sintered steel. Liquid phase sintrering based on addition of boride to AISI 316L type steels have previously been studied, but were found to be sensitive to intergranular corrosion due to formation of intermetallic phases rich in chromium and molybdenum. In order to improve this system further, new investigations have focused on the use of higher alloyed stainless steel as base material. The stainless base powders were added different amounts and types of boride and sintered in hydrogen at different temperatures and times in a laboratory furnace. During sintering the outlet gas was analyzed and subsequently related to the obtained microstructure. Thermodynamic calculations, made by use of the computer programme Thermo-Calc, were also correlated with the observed microstructure. Corrosion measurements by electrochemical techniques show no signs of intergranular corrosion in contrast to the case of AISI 316L based steel. Furthermore most of the material showed excellent corosion resistance in the neutral salt spray by withstanding more than 1500 hours exposure without any corrosion, either on as-sintered surfaces or worked samples.
    Original languageEnglish
    Title of host publicationProceedings of Joint Nordic Conference in Powder Technology
    Number of pages1
    Place of PublicationCopenhagen
    Publication date1996
    Publication statusPublished - 1996
    EventJoint Nordic Conference in Powder Technology - Copenhagen, Denmark
    Duration: 13 Nov 199614 Nov 1996

    Conference

    ConferenceJoint Nordic Conference in Powder Technology
    CountryDenmark
    CityCopenhagen
    Period13/11/199614/11/1996

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