Effects of Second Phases on Charpy Impact Energy and Crack Propagation Behavior of Hastelloy N Sheet Using for Molten Salt Reactor
| Autor: | Yong Jun Wu, Yun Zhou, Yang Fan, Yan Hua Peng, Wei Zhang, Wei Zhu, Rong Jian Pan, Lu Wu |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Molten salt reactor Mechanical Engineering Charpy impact test Fracture mechanics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Mechanics of Materials law 0103 physical sciences General Materials Science Composite material 0210 nano-technology Energy (signal processing) |
| Zdroj: | Key Engineering Materials. 842:135-142 |
| ISSN: | 1662-9795 |
| Popis: | In order to obtain the effect of second phases on Charpy impact energy and crack propagation behavior of Hastelloy N sheet, Charpy notched impact toughness test have been accomplished with different directions (RD, ND) of V-notch after solution treatment. The fracture morphology and microstructure are observed by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). It is shown that the dominant second phases in Hastelloy N after solution treatment includes molybdenum-riched Ni-Mo phase, which dissolve some elements such as chromium, silicon and ferrum, and a few carbides. The Charpy impact energy of sample 2# (RD) is 225J, almost twice as much as sample 1# (ND). Based on the reconstruction of morphology and distribution of second phases, the mechanism for effect of second phases on crack propagation behavior is discussed. The islands of second phase particles modify the stress triaxiality state, resulting in the propagation path of crack in 2# is totally different from that in 1#. |
| Databáze: | OpenAIRE |
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