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Consolidation of an Iron-Base Superalloy by Powder Metallurgy Techniques

Public Domain


Details

  • Personal Author:
  • Description:
    As part of its goal to minimize the requirements for critical materials, the federal Bureau of Mines has investigated the consolidation of an iron-base superalloy (20 pct cr, 5 pct each ni and mn, 1 pct each c, w, mo, and cb, and the balance fe) and its modifications by powder metallurgy (p/m) techniques. Vacuum- atomized, prealloyed powder was used. Consolidation was by sintering of cold-pressed alloy powder, or by forging plus rolling or extrusion of canned powder. Several commercial lubricants were evaluated in the pressing operation. At 50-tsi compacting pressure with up to 3 wt-pct lubricant, green strengths did not exceed 1,000 psi. Powder sintered just below the solidus temperature attained a tensile strength of 69,000 psi and 4 pct elongation. Liquid-phase sintering produced higher densities, lower tensile strengths, and nil ductibility. Canned powder was forged and rolled at 1,200 deg c, yielding a 100-hr rupture strength of 9,800 psi at 815 deg c and a room-temperature tensile strength of > 130,000 psi at 6 pct elongation. Heat treatment of modified p/m iron-base alloy containing 0.63 pct c resulted in a 100-hr ruptured strength of 17,000 psi. Oxidation resistance at 805 deg to 815 deg c of the forged and rolled p/m iron-base alloy was similar to that of the cast iron-base alloy and superior to conventional stainless steels. [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    RORC - Rolla Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-22
  • NIOSHTIC Number:
    nn:10006687
  • Federal Fiscal Year:
    1981
  • Peer Reviewed:
    False
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:442bb81eeb366b1145e94c4b10d6b74a21d0dee9a7d8980f78b9bfc4065ba3477b60b309fe3b1b2845f508d609b35b7ff5385f0fe7cdad90ec49d6ea52969578
  • Download URL:
  • File Type:
    Filetype[PDF - 3.05 MB ]
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