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Tailoring the Mechanical Properties Through the Control of Heat Treatments in a Precipitation Hardening Metastable Stainless Steel

Anpassung der mechanischen Eigenschaften durch Steuerung der Wärmebehandlung in einem ausscheidungshärtenden metastabilen Edelstahl

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Abstract

This research focusses on a complex precipitation (Ni3(Ti,Al)) hardenable metastable stainless steel. Dual phase (austenite, γ/martensite, α′) and ultrafine grained austenitic microstructures obtained after applying isochronal heat treatments (0.1–10 ℃/s) to a cold-rolled (CR) metastable stainless steel have been microstructurally and mechanically characterized using different experimental techniques (optical microscopy, SEM, TEM, magnetic measurements, tensile tests). A wide range of strength (2.1–1.1 GPa) and elongation (3–25%) values have been obtained using sub-size samples (7 mm in gauge length). The scientific aim is the understanding of those microstructural parameters and mechanisms that influence the achievement of ultra-fine grained microstructures and control or the mechanical behaviour of different complex microstructures in this type of steels. Whereas the industrial aim would be to expand the applicability of this steel and use this scientific knowledge to design steels with optimized microstructures and mechanical properties.

Zusammenfassung

Diese Forschung konzentriert sich auf einen komplexen aushärtbaren metastabilen Edelstahl (Ni3(Ti,Al)). Doppelphasen- (austenit, γ/martensit, α′) und ultrafeinkörnige austenitische Mikrostrukturen, die nach Anwendung isochroner Wärmebehandlungen (0.1–10 ºC/s) auf einen kaltgewalzten (CR) metastabilen rostfreien Stahl erhalten wurden, wurden mikrostrukturell und mechanisch unter Verwendung verschiedener charakterisiert experimentelle techniken (optische Mikroskopie, SEM, TEM, magnetische Messungen, Zugversuche). Ein breiter Bereich von Festigkeitswerten (2.1–1.1 GPa) und Dehnungswerten (3–25 %) wurde unter Verwendung von ben mit geringer Größe (7 mm Messlänge) erhalten. Das wissenschaftliche Ziel ist das Verständnis der mikrostrukturellen Parameter und Mechanismen, die das chen von ultrafeinen Mikrostrukturen und die Kontrolle oder das mechanische Verhalten verschiedener komplexer Mikrostrukturen in dieser Art von Stählen beeinflussen. während das industrielle Ziel darin besteht, die Anwendbarkeit dieses Stahls zu erweitern und diese wissenschaftlichen Erkenntnisse zu nutzen, um Stähle mit optimierten Mikrostrukturen und mechanischen Eigenschaften zu konstruieren.

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Acknowledgements

C. Celada-Casero would like to thank the financial support from the Consejo Superior de Investigaciones Científicas (CSIC) (JAEPre_2011_01167) in the form of a JAE-predoc grant, co-funded by the European Social Fund and to the National Science Council of Taiwan granting a research internship at the National Taiwan University (NTU). I. Toda-Caraballo is grateful for financial support through the fellowship 2016-T2/IND-1693 from the Programme Atracción de talento investigador (Consejería de Educación, Juventud y Deporte, Comunidad de Madrid). C. Celada-Casero and D. San-Martin acknowledge the financial support from the Ministerio de Economía y Competitividad (project No. MAT2010-19522). The authors are grateful to CAI of Physical Techniques, (Complutense University of Madrid) and the Phase Transformations and Electron Microscopy labs of CENIM-CSIC for the experimental support. Authors are also grateful to Prof. Jan Post and Ir. Manso Groen from Philips Consumer Lifestyle for supplying the steels for this investigation.

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Authors and Affiliations

  1. Tata Steel Europe, Velsen-North, The Netherlands

    Carola Celada-Casero PhD

  2. CNME, Universidad Complutense de Madrid (UCM), Madrid, Spain

    Esteban Urones-Garrote

  3. Materalia Research Group, Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Madrid, Spain

    Jesús Chao, Isaac Toda-Caraballo & David San-Martin PhD

  4. National Taiwan University, Taipei, Taiwan (Republic of China)

    Jer-Ren Yang

Authors
  1. Carola Celada-Casero PhD
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  2. Esteban Urones-Garrote
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  3. Jesús Chao
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  5. Isaac Toda-Caraballo
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  6. David San-Martin PhD
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Correspondence to Carola Celada-Casero PhD or David San-Martin PhD.

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Celada-Casero, C., Urones-Garrote, E., Chao, J. et al. Tailoring the Mechanical Properties Through the Control of Heat Treatments in a Precipitation Hardening Metastable Stainless Steel. Berg Huettenmaenn Monatsh 165, 26–32 (2020). https://doi.org/10.1007/s00501-019-00930-w

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