Assessment of Aging Treatment on Mechanical Properties and Damaging Phenomena of 17-4 PH Stainless Steel by Small Punch Test
| Autor: | Cheng, Chao-Yang, 鄭朝陽 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 To evaluate the fracture toughness of 17-4 stainless alloy, a simply Small Punch Test process (with thin slice 0.5mm specimen) was proposed in this study. The effect of the aging temperature on the strain deformation and fracture toughness was obtained with the detailed fractography, the plastic deformation and load–displacement experi -mental results. A series of experimental procedures have been performed to evaluate the effect of the aging precipitation on the load–deflection curves, the fracture strain and fracture toughness of the specimens, the results show that after the homogenized, solid solution treatment, the specimen hardness value of about HV285. As the aging temperature, between 400 ℃ ~ 620 ℃,the specimen hardness values increased first, then decreased the change in circumstances. Peak hardness of about appearing in 480 ℃ when. The observed changes in the microstructure can be found in the aging precipitation uniformly organized, meticulous, it is the main factor of increased hardness caused. At that time when the aging temperature is higher to 480℃, the microstructure coarsening, there have been over aging and declined to give the results of hardness. The results from the SPT test, the mechanical properties of the 17-4 material, by increasing aging temperature, the ups and downs of the situation change occurs, similar to the trend of the hardness testing. Tests designed to understand the rheological behavior of the 17-4 sheet material. Selected results of tests after the SPT test, the specimen further to observe with SEM. The metal flow deformation process and the failure morphologies was characterized by the stress state. In this thesis, the 17-4 material was analyzed series comparison relations between aging temperature and deformation process. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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