Delayed failure of silver-aided diffusion welds between steel
Silver interlayer diffusion bonds that were fabricated using planar-magnetron sputtering exhibited very high tensile strengths. However, these joints undergo delayed failure at relatively low tensile stresses at ambient temperature, apparently by a microvoid coalescence mechanism at the bond interfaces. Two classes of delayed tensile failure were investigated. In the first case, the applied stress does not produce any plastic deformation in the base metal, and failure appears to be controlled by time-dependent plasticity within the silver interlayer. In the second case, modest time-dependent plasticity is observed in base metals, and concomitant shear occurs within the softer silver under a high triaxial stress state. Here, the time-dependent plasticity of the base metal may accelerate the failure. These findings are believed to be applicable to bonds for which the interlayers are prepared by processes different than physical vapor deposition. 15 refs., 6 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5764987
- Report Number(s):
- UCRL-101547; CONF-8909171-1; ON: DE89016652
- Resource Relation:
- Conference: 2. international conference on brazing, high-temperature brazing and diffusion welding, Essen, Germany, F.R., 19-20 Sep 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Time-dependent failure of silver interlayer welds
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Related Subjects
WELDED JOINTS
FAILURES
CREEP
DIFFUSION
EMBRITTLEMENT
INTERFACES
MICROSTRUCTURE
SILVER
SPUTTERING
STAINLESS STEEL-304
STRAIN HARDENING
STRAIN RATE
TENSILE PROPERTIES
TIME DEPENDENCE
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
STAINLESS STEELS
STEEL-CR19NI10
STEELS
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication