Microstructural changes in weld joint of COST F and FB2 steels after long term creep tests
| Autor: | D. Jandová, J. Kasl |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Heat-affected zone
Materials science 02 engineering and technology Welding Laves phase 01 natural sciences law.invention Carbide 0203 mechanical engineering law 0103 physical sciences Materials Chemistry Forensic engineering Joint (geology) 010302 applied physics Mechanical Engineering Gas tungsten arc welding Metallurgy technology industry and agriculture Metals and Alloys respiratory system Condensed Matter Physics Microstructure 020303 mechanical engineering & transports Creep Mechanics of Materials Ceramics and Composites |
| Zdroj: | Materials at High Temperatures. 34:482-491 |
| ISSN: | 1878-6413 0960-3409 |
| DOI: | 10.1080/09603409.2017.1380909 |
| Popis: | A trial weld joint of COST F and FB2 steels was produced using the GTAW HOT-WIRE method in conditions used in industry for welding steam turbine rotors. Long-term creep tests to the rupture of smooth cross-weld samples were carried out. Creep strength and hardness profiles across the weld joint were evaluated and correlated with the microstructure. Microstructures of ruptured samples were investigated using light, scanning and transmission electron microscopy and compared with virgin samples. Fracture occurred in COST F steel and its heat affected zone. Precipitation of Laves phase and structure recovery were the main reasons for the failure. Quantitative evaluation of M23C6 carbides and Laves phase particles in different parts of the weld joint was carried out. In the initial conditions, small Laves phase particles occurred only exceptionally in the weld metal. During creep at temperatures above 575 °C Laves phase precipitated in all parts of the weld joint and especially in the heat affected zon... |
| Databáze: | OpenAIRE |
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