The influence of stress on the microstructural stability of type 316 stainless steel weld metal at high temperatures has been examined using the gauge section and shoulder region of creep specimens tested at 823, 873, and 923 K. M23 C6 carbide and the intermetallic phase σ have been observed in optical metallography and X-ray diffraction analysis of the extracted precipitates. The amount of precipitation in the gauge section was generally found to be more than that in the shoulder region. The application of stress was seen to enhance the precipitation kinetics of the σ phase.
MST/1987
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