Precipitation reactions in a Cu-Ni-Al medium carbon alloyed dual hardening steel

Hofinger, Matthias; Turk, Christoph; Ognianov, Miloslav; Leitner, Harald; Schnitzer, Ronald

doi:10.1016/j.matchar.2020.110126

Cited by 11 publications

(1 citation statement)

References 49 publications

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“…There have been several successful research studies to achieve high strength while retaining reasonable ductility through solid solution strengthening, precipitation strengthening, transformation hardening, dispersion hardening, etc., by incorporating multiple phases in alloys with several elements, as well as developing composites [6][7][8][9][10]. In addition, several techniques were used to refine the microstructures and improve the mechanical properties through grain refinement by several means, for example; severe plastic deformation, thermo-mechanical treatments, friction stir processing, etc.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Structure Design: A Strategy for Outstanding Mechanical Properties in Structural Materials

Sharma

Dirras

Ameyama

2020

Metals

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Structured heterogeneous materials are ubiquitous in a biological system and are now adopted in structural engineering to achieve tailor-made properties in metallic materials. The present paper is an overview of the unique network type heterogeneous structure called Harmonic Structure (HS) consisting of a continuous three-dimensional network of strong ultrafine-grained (shell) skeleton filled with islands of soft coarse-grained (core) zones. The HS microstructure is realized by the strategic processing method involving severe plastic deformation (SPD) of micron-sized metallic powder particles and their subsequent sintering. The microstructure and properties of HS-designed materials can be controlled by altering a fraction of core and shell zones by controlling mechanical milling and sintering conditions depending on the inherent characteristics of a material. The HS-designed metallic materials exhibit an exceptional combination of high strength and ductility, resulting from optimized hierarchical features in the microstructure matrix. The experimental and numerical results demonstrate that the continuous network of gradient structure in addition to the large degree of microstructural heterogeneity leads to obvious mechanical incompatibility and strain partitioning, during plastic deformation. Therefore, in contrast to the conventional homogeneous (homo) structured materials, synergy effects, such as synergy strengthening, can be obtained in HS-designed materials. This review highlights recent developments in HS-structured materials as well as identifies further challenges and opportunities.

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Section: Introductionmentioning

confidence: 99%

Harmonic Structure Design: A Strategy for Outstanding Mechanical Properties in Structural Materials

Sharma

Dirras

Ameyama

2020

Metals

View full text Add to dashboard Cite

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Dissolution and precipitation of copper-rich phases during heating and cooling of precipitation-hardening steel X5CrNiCuNb16-4 (17-4 PH)

et al. 2020

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Continuous heating transformation (CHT) diagrams and continuous cooling transformation (CCT) diagrams of precipitation-hardening steels have the drawback that important information on the dissolution and precipitation of Cu-rich phases during continuous heating and cooling are missing. This work uses a comparison of different techniques, namely dilatometry and differential scanning calorimetry for the in situ analysis of the so far neglected dissolution and precipitation of Cu-rich phases during continuous heating and cooling to overcome these drawbacks. Compared to dilatometry, DSC is much more sensitive to phase transformation affecting small volume fractions, like precipitation. Thus, the important solvus temperature for the dissolution of Cu-rich phases was revealed from DSC and integrated into the CHT diagram. Moreover, DSC reveals that during continuous cooling from solution treatment, premature Cu-rich phases may form depending on cooling rate. Those quench-induced precipitates were analysed for a broad range of cooling rates and imaged for microstructural analysis using optical microscopy, scanning electron microscopy and transmission electron microscopy. This information substantially improves the CCT diagram.

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Concomitant Precipitation of Intermetallic β-NiAl and Carbides in a Precipitation Hardened Steel

Jakob,

Hörnqvist Colliander,

Kawser

et al. 2024

Metall Mater Trans A

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The investigated steel is hardened by precipitation of both intermetallic β-NiAl particles and carbides. Around peak hardness, here reached after aging at 520 °C for 6 h, the number density of β-NiAl particles is 2.4 × 1024 and 4.4 × 1023 for carbides, respectively. The carbides and β-NiAl often form co-precipitates with presumably the carbides nucleating on the β-NiAl precipitates. The secondary carbides are mainly of the Cr-rich M23C6 type in the investigated states. The steel has a good resistance against over-aging, whereby the β-NiAl coarsen considerably slower than the carbides.

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Precipitation reactions in a Cu-Ni-Al medium carbon alloyed dual hardening steel

Cited by 11 publications

References 49 publications

Harmonic Structure Design: A Strategy for Outstanding Mechanical Properties in Structural Materials

Harmonic Structure Design: A Strategy for Outstanding Mechanical Properties in Structural Materials

Dissolution and precipitation of copper-rich phases during heating and cooling of precipitation-hardening steel X5CrNiCuNb16-4 (17-4 PH)

Concomitant Precipitation of Intermetallic β-NiAl and Carbides in a Precipitation Hardened Steel

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