The explosion bonding of Inconel 625 to nickel alloy steel will not reduce the fatigue or corrosion fatigue strengths of either metal, judging from metallurgical analysis and and studies of crack initiation and growth. Scale model tests and economic studies of marine applications, such as propeller shaft sleeves, should therefore be carried out. Metallurgical investigation before and after bonding and stress relieving showed no adverse effects at the interface except for a slight increase in sensitivity of the steel to etching. The fatigue and corrosion fatigue lives of the Inconel, tested at 1800 cpm, were not reduced during bonding and the interface did not appear to be a source of weakness. The corrosion fatigue strength of the bonded steel at the interface was not reduced by bonding. Crack propagation rates of cracks growing from the Inconel into the steel were near those of the unbonded metals. Cracks were observed to turn away from the hardened metal at the interface. Intentional defects placed at the interface reduced the mechanical strength but at the same time tended to act as crack stoppers.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Ocean Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139
  • Authors:
    • Scalzo, J C
  • Publication Date: 1973-6

Subject/Index Terms

Filing Info

  • Accession Number: 00048385
  • Record Type: Publication
  • Source Agency: Massachusetts Institute of Technology
  • Report/Paper Numbers: MS Thesis
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM