{
  "abstract": "In this study, phase transformations and microstructural evolution in F55 (UNS S32760) super duplex stainless steel powder processed by hot isostatic pressing (HIP) were investigated. Two kinds of HIP cycles were performed: a complete cycle carried out at 1200 °C under a pressure of 102 MPa with a holding time of 4 hours, and a series of interrupted tests (without holding time) performed at 800, 900, 1000, 1100, and 1200 °C. Microstructural characterizations revealed that after the complete HIP cycle, the material exhibits a biphasic microstructure, consisting of nearly equal fractions of austenite and ferrite, similar to conventionally processed duplex steels. During interrupted tests, σ phase precipitation was observed at temperatures of 900 °C and above, resulting from ferrite decomposition via the eutectoid reaction α → σ + γ2. This transformation led to the formation of needle-shaped secondary austenite (γ2), denoted as Widmanstätten austenite. At temperatures above 1100 °C, significant σ phase dissolution occurred, accompanied by a progressive increase in ferrite fraction and a gradual disappearance of the Widmanstätten austenite. The precipitation of the σ phase increases the hardness of the sintered samples, while its dissolution subsequently leads to a decrease. In the absence of the σ phase, ferrite appears to provide higher hardness than austenite.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "R. Mvodo Eba"
    },
    {
      "name": "Maria-Rosa Ardigo-Besnard"
    },
    {
      "name": "J.-P. Chateau-Cornu"
    },
    {
      "name": "F. Herbst"
    },
    {
      "name": "N. Geoffroy"
    },
    {
      "name": "Arnaud Proietti"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7tx6warc47fgg.bib",
  "cited_by": 0,
  "doi": "10.1016/j.jmrt.2026.09.059",
  "fulltext_url": null,
  "id": "7tx6warc47fgg",
  "issns": [
    "2238-7854",
    "2214-0697"
  ],
  "landing_url": "https://ube.hal.science/hal-05742806v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "1.chim.mate"
    ],
    [
      "openalex",
      "2210|Powder Metallurgy Techniques and Materials"
    ]
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  "openalex": "W7211890924",
  "pdf_url": "https://ube.hal.science/hal-05742806/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/7tx6warc47fgg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:31Z",
      "native_id": "hal-05742806",
      "source": "hal",
      "url": "https://ube.hal.science/hal-05742806v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:1.chim.mate",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Microstructural phase transformation of a super duplex steel powder sintered by hot isostatic pressing",
  "title_text": "Microstructural phase transformation of a super duplex steel powder sintered by hot isostatic pressing",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:31Z",
  "url": "https://research.draconitic.com/paper/7tx6warc47fgg",
  "venue": "Journal of Materials Research and Technology",
  "versions": []
}