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RISS 인기검색어
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- 저자 : Yijiang Zeng (검색결과 2 건)
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Yijiang Zeng,Yu Pan,Ning Wang,Jian Chen,Xianhui Cai 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
The creep fracture behavior between selective laser melted (SLMed) and forged alloy 230 after testing at 1200 °C under differentapplied stresses was compared. The results showed that both the creep behavior of SLMed and forged alloy 230 followedthe power law and obeyed the Monkman–Grant relation. The SLMed samples parallel to the building direction exhibitedsuperior creep resistance than those perpendicular to the building direction, and the forged samples were in between, whilethey all exhibited poor creep ductility compared with that of the forged samples. Furthermore, the relations of applied stressand maximum allowable creep lifetime could be built to evaluate the creep resistance of the alloys. The SLMed samplesparallel to the building direction showed discrete trans/intergranular cracks, while those perpendicular to the building directionand forged materials depicted continuous and discrete intergranular cracks, respectively. Furthermore, the creep fracturemodes at different loadings were revealed by correlating the creep damage tolerance factor with the fractured microstructure. In addition, the effects of the initial microstructure characteristics, such as grain morphology, grain boundaries, grain size,internal defects and precipitates, on the creep strength and life at high temperatures were presented and analyzed.
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Monitoring for Damage in Two-Dimensional Pre-Stress Scratching of SiC Ceramics
Gaofeng Zhang,Yijiang Zeng,Wenbo Zhang,Houming Zhou,Zhangya Wen,Yuan Yao 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
This paper reports an approach to use the acoustic emission (AE) technology for monitoring the surface/subsurface damage in twodimensional pre-stress scratching of SiC ceramics, in which the two-dimensional pre-stress is used to decrease the scratch-induced damage. Experiments in this study were conducted on a UMT-2 machine (CETR USA) utilizing a designed pre-stressing device under pressures of 0 MPa, 300 MPa and 500 MPa. The experimental results demonstrate that average frequency and magnitude of AE signals have a good correlation with the scratching tangential force and the scratch-induced surface /subsurface damage of materials. For a given normal load, the average frequency and magnitude of AE signals are observed to decrease with the increase in pre-stress, which indicates that surface/subsurface damage of SiC ceramics induced by two-dimensional pre-stress scratching is less than that induced by conventional scratching. The findings provide fundamental information for developing a practical on-line AE monitoring system that is effective in detecting surface/subsurface damage in scratching or grinding of ceramics. These results also demonstrate that two-dimensional pre-stress method contributes to decreasing the machining damage of brittle materials.
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