Ambient-temperature creep failure of silver-aided diffusion bonds between steel

Henshall, G A; Kassner, M E; Rosen, R S

Title: Ambient-temperature creep failure of silver-aided diffusion bonds between steel

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Abstract

It has long been known that thin (e.g., 1 {mu}m {minus} 1 mm) interlayer bonds between higher strength base materials may have high ultimate tensile or rupture strengths despite the relatively low strength of the filler metal. The high strength of the joint is due to the mechanical constraint provided by the stronger base metals which restricts transverse contraction of the interlayer. The constraint produces a triaxial state or stress and reduces the effective stress, thus reducing the tendency for the interlayer to plastically deform. Plasticity of the base metal reduces the constraint and decreases the strength of the bond. The purpose of this work was twofold. First, the validity of the base-metal- accelerated'' delayed-failure theory for bonds utilizing plastic base metals was checked. Creep-rupture tests were performed on diffusion-bonded specimens using silver interlayers deposited by planar-magnetron sputtering (PMS), a physical vapor-deposition process. The PMS process was preferred because of the superior quality and strength of the bond and because this modern low-temperature joining process is increasingly utilized for joining ceramic and composite materials. The role of plastic base metals in the fracture process was further investigated by conducting tensile-rupture tests of diffusion bonds made with stainless steel base metalsmore »« less

Authors:: Henshall, G A; Kassner, M E; Rosen, R S

Publication Date:: Mon Jan 15 00:00:00 EST 1990

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: DOE/DP

OSTI Identifier:: 6978879

Report Number(s):: UCRL-101690; CONF-9003155-1
ON: DE90010687

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Conference

Resource Relation:: Conference: 2. international conference on diffusion bonding-applications, Cranfield (UK), 28-29 Mar 1990

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; MARAGING STEELS; DIFFUSION WELDING; SILVER; STAINLESS STEEL-304; WELDED JOINTS; CREEP; FAILURES; PLASTICITY; TENSILE PROPERTIES; ALLOYS; AUSTENITIC STEELS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; ELEMENTS; FABRICATION; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; JOINING; JOINTS; MARTENSITIC STEELS; MATERIALS; MECHANICAL PROPERTIES; METALS; NICKEL ALLOYS; STAINLESS STEELS; STEEL-CR19NI10; STEELS; TRANSITION ELEMENTS; WELDING; 360103* - Metals & Alloys- Mechanical Properties; 360101 - Metals & Alloys- Preparation & Fabrication

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                    Henshall, G A, Kassner, M E, and Rosen, R S. Ambient-temperature creep failure of silver-aided diffusion bonds between steel.  United States: N. p., 1990. 
        Web.

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                    Henshall, G A, Kassner, M E, & Rosen, R S. Ambient-temperature creep failure of silver-aided diffusion bonds between steel.  United States.

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                    Henshall, G A, Kassner, M E, and Rosen, R S. 1990.  
        "Ambient-temperature creep failure of silver-aided diffusion bonds between steel".  United States.  https://www.osti.gov/servlets/purl/6978879.

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@article{osti_6978879,

  title        = {Ambient-temperature creep failure of silver-aided diffusion bonds between steel},

  author       = {Henshall, G A and Kassner, M E and Rosen, R S},

  abstractNote = {It has long been known that thin (e.g., 1 {mu}m {minus} 1 mm) interlayer bonds between higher strength base materials may have high ultimate tensile or rupture strengths despite the relatively low strength of the filler metal. The high strength of the joint is due to the mechanical constraint provided by the stronger base metals which restricts transverse contraction of the interlayer. The constraint produces a triaxial state or stress and reduces the effective stress, thus reducing the tendency for the interlayer to plastically deform. Plasticity of the base metal reduces the constraint and decreases the strength of the bond. The purpose of this work was twofold. First, the validity of the base-metal- accelerated'' delayed-failure theory for bonds utilizing plastic base metals was checked. Creep-rupture tests were performed on diffusion-bonded specimens using silver interlayers deposited by planar-magnetron sputtering (PMS), a physical vapor-deposition process. The PMS process was preferred because of the superior quality and strength of the bond and because this modern low-temperature joining process is increasingly utilized for joining ceramic and composite materials. The role of plastic base metals in the fracture process was further investigated by conducting tensile-rupture tests of diffusion bonds made with stainless steel base metals of different yield strengths, and therefore different creep rates. The second purpose was to determine whether delayed failure occurs in interlayer bonds between elastic base metals, which do not creep over the range of applied stresses. This question is particularly relevant since many alloys, ceramics and composites fall within this category. Again, ambient and near-ambient temperature creep-rupture tests were performed at a variety of stresses below the UTS of the bond. 25 refs., 7 figs.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6978879},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Jan 15 00:00:00 EST 1990},

  month        = {Mon Jan 15 00:00:00 EST 1990}

}

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