Energy and Climate

Mechanical Testing Overview

Mechanical 1-2

(2008). Standard Test Methods for Tension Testing of Metallic Materials. E8/E8M – 11, ASTM International.

  •  ASTM standard (E8) used for tension testing guidance, with tests in constant displacement mode
  • 2 tests were performed, room temperature and at 650°C
  • Post mortem metallography was performed on both samples

Room Temperature Tensile Test

Mechanical 3

 Room Temperature Metallography

Mechanical 4

  • Voids were observed in bond lines away from fracture surface.
  • Unclear if voids were caused or exaggerated by EDM process or solely from tension tests.
  • Most bonds showed no change from as made conditions.
  • Bond #7 (lower left) has no observed porosity. May indicate defects observed in corner sample are local to the corner region.

650°C Temperature Tensile TestMechanical 5-6

 650°C Test MetallographyMechanical 7

  • Results were effectively identical to room temperature tests.
  • Voids were observed in bond lines away from fracture surface.
  • Most bonds showed no change from as made conditions.

Mechanical PropertiesMechanical 8

  • Reduction in UTS was observed, as expected, between high and low temperature tests.
  • UTSmin of 485MPa (ASME BPVC);  
    • Room temperature failed ~72% of this value
    • 650°C test failed ~52% of this value

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