Zmiany mikrostruktury w połączeniach spawanych różnoimiennych materiałów stosowanych w energetyce

Blicharski, M.

doi:10.26628/ps.v85i3.267

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2020

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“…during scheduled repairs or diagnostic tests, the service life of such steels after many years of operation. The foregoing refers both to high-temperature creep resisting alloys and welded joints made of them [1][2][3]. The research work discussed in this article involved the analysis of the microstructure and tests of mechanical properties of a similar joint (after operation) made in austenitic steel TP347HFG.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Welded Joints in Austenitic Steel TP347HFG after Operation

Wojsyk¹,

Merda²,

Klimaszewska³

et al. 2020

eBIS

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The analysis involved a similar welded joint made of steel TP347HFG after operation at a temperature of 580°C. Tests revealed that the primary mechanisms responsible for the degradation of the microstructure in all areas of the joint subjected to analysis were precipitation processes within the grains and along the grain boundaries. The grain boundaries contained two morphologies forming a continuous lattice. Precipitation processes resulted in the high tensile strength of the joint and high hardness within the weld face area. After operation, the test joint was characterised by relatively high impact energy, which could be attributed to the fine-grained microstructure and the presence of numerous annealing twins.

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Section: Introductionmentioning

confidence: 99%