Varied sub-grain microstructure impacts fracture behavior and resistance in 316LN weld metal
| Autor: | Dai Keshun, Zhu Li, Xiao Wenkai, Zhang Mingxiang, Yang Xue, Mudi Kunqi, Zhang Fuju, Chen Fangyu, Zhai Xian |
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| Rok vydání: | 2017 |
| Předmět: |
Toughness
Materials science Mechanical Engineering Metallurgy Fracture mechanics 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Finite element method 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Volume fraction Fracture (geology) General Materials Science Composite material 0210 nano-technology Anisotropy Weld metal |
| Zdroj: | Engineering Fracture Mechanics. 176:100-115 |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/j.engfracmech.2017.02.025 |
| Popis: | Sub-grain microstructure generally exists in the 316LN weld metal (WM) and the sub-grain size and morphology as well as its orientation vary. In order to analyze the effect of 316LN cast microstructure characteristics on its fracture behavior, a numerical model based on cohesive finite element method (CFEM) was presented. Based on experimental microstructure images, three kinds of morphological microstructures were numerically modeled with quantified parameters. The simulated result predicted the experimental fracture behaviors well, which validated the effectiveness of the CFEM model. Two fracture modes were summarized and the fracture resistance values of different microstructures were compared and analyzed quantitatively. Sub-grain boundaries in the weld metal showed inhibition effects on crack propagation. However, a high volume fraction of sub-grain boundaries made the fracture resistance decline. Columnar and dendritic microstructures showed anisotropic fracture resistance and the overlong secondary dendritic arms made the toughness worse. |
| Databáze: | OpenAIRE |
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