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  "story": {
    "story_id": "mp-2026-08-04-008",
    "source_story_id": "tmp-story-titanium-laser-electron-powder-bed-fusion",
    "edition_id": "mp-2026-08-04-morning-0026",
    "edition_url": "https://themachinepress.com/edition/2026-08-04",
    "position": 8,
    "story_type": "dispatch",
    "section": "chips-infrastructure",
    "editorial_classification": "editorial",
    "headline": "The Hotter Powder Bed Traded Martensite for Ductility",
    "slug": "the-hotter-powder-bed-traded-martensite-for-ductility",
    "dek": "Electron-beam printing produced a titanium structure that combined 1,120-megapascal yield strength with 11.1 percent elongation.",
    "summary": "Electron-beam printing produced a titanium structure that combined 1,120-megapascal yield strength with 11.1 percent elongation.",
    "body_text": "A comparison of Ti-6Al-4V made by laser and electron-beam powder-bed fusion found acicular martensite and high residual stress in the laser-built specimens. Electron-beam preheating at 740 degrees Celsius slowed cooling and produced a coarser alpha-plus-beta lamellar structure; together with 0.24 percent oxygen, it reached 1,120 plus or minus 12 megapascals in yield strength and 11.1 plus or minus 1.3 percent elongation. A deformation-induced phase change also helped accommodate strain. The finding concerns tested specimens, not every machine or production geometry.",
    "why_it_matters": "Electron-beam printing produced a titanium structure that combined 1,120-megapascal yield strength with 11.1 percent elongation.",
    "limitations": [
      "The finding concerns tested specimens, not every machine or production geometry."
    ],
    "importance": 8,
    "canonical_url": "https://themachinepress.com/story/mp-2026-08-04-008/the-hotter-powder-bed-traded-martensite-for-ductility",
    "json_url": "https://themachinepress.com/story/mp-2026-08-04-008.json",
    "first_published_at": "2026-08-04T09:00:00.000-04:00",
    "modified_at": "2026-08-04T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-08-04-008-001",
        "text": "Electron-beam printing produced a titanium structure that combined 1,120-megapascal yield strength with 11.1 percent elongation.",
        "source_ids": [
          "source-2026-08-04-008"
        ],
        "qualification": "The finding concerns tested specimens, not every machine or production geometry."
      }
    ],
    "source_ids": [
      "source-2026-08-04-008"
    ],
    "tags": [
      "additive manufacturing",
      "titanium",
      "materials"
    ],
    "image_url": "https://themachinepress.com/issues/2026-08-04/titanium-powder-bed-file-image.webp",
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-08-04-008",
      "title": "Materials: laser and electron-beam powder-bed titanium",
      "publisher": "MDPI",
      "url": "https://doi.org/10.3390/ma19153300",
      "canonical_url": "https://doi.org/10.3390/ma19153300",
      "source_type": "secondary_reporting",
      "is_primary_source": false,
      "published_at": null,
      "accessed_at": "2026-08-04T08:29:02.827-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-08-04-008-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "The Hotter Powder Bed Traded Martensite for Ductility",
    "publisher": "The Machine Press",
    "published_at": "2026-08-04T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-08-04-008/the-hotter-powder-bed-traded-martensite-for-ductility"
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}