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Full-Text Articles in Engineering
Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson
Characterization Of The Bake-Hardening Behavior Of Transformation Induced Plasticity And Dual-Phase Steels Using Advanced Analytical Techniques, Ilana Timokhina, E V. Pereloma, S P. Ringer, Rongkun Zheng, Peter D. Hodgson
Faculty of Engineering - Papers (Archive)
The bake-hardening (BH) behavior of TRansformation Induced Plasticity (TRIP) and Dual-Phase (DP) steels after intercritical annealing (IA) has been studied using transmission electron microscopy, X-ray diffraction and three dimensional atom probe tomography. It was found for the DP steel that carbon can segregate to dislocations in the ferrite plastic deformation zones where there is a high dislocation density around the “as-quenched” martensite. The carbon pinning of these dislocations, in turn, increases the yield strength after aging. It was shown that bake-hardening also leads to rearrangement of carbon in the martensite leading to the formation of rod-like low temperature carbides in …
A Method For Assessing Failure Behavior Of Sand With Initial Static Shear, Gabriele Chiaro, Junichi Koseki
A Method For Assessing Failure Behavior Of Sand With Initial Static Shear, Gabriele Chiaro, Junichi Koseki
Faculty of Engineering - Papers (Archive)
In sloped ground, soil elements are subjected to an initial static shear stress on the horizontal plane or an assumed failure surface. During earthquake shaking, these elements are subjected to additional cyclic shear stress due to shear waves propagating vertically upward from bedrock. The superimposition of static and cyclic shear stresses can have major effects on the response of the soil, leading to liquefaction-induced failure behavior of natural and artificial slopes of sandy deposits and the consequent development of extremely large ground deformation. In order to address the above issue, in this paper, a method to assess the failure behavior …
Stress-Dilatancy Behavior Of Loose Sand During Drained Cyclic Torsional Shear Loading, Seto Wahyudi, Gabriele Chiaro, L I. N De Silva, Junichi Koseki
Stress-Dilatancy Behavior Of Loose Sand During Drained Cyclic Torsional Shear Loading, Seto Wahyudi, Gabriele Chiaro, L I. N De Silva, Junichi Koseki
Faculty of Engineering - Papers (Archive)
In nature, soil is frequently subjected to cyclic loading under drained or undrained conditions such as traffic loads and earthquakes. In order to investigate the behavior of soil during drained cyclic loading, an accurate volumetric change measurement is one of the key issues to obtain properly the stress-dilatancy relationship. Several researchers such as Pradhan et al. (1989), Shahnazari and Towhata (2002), Nishimura (2002), De Silva (2008) among others, have conducted experimental studies to investigate the stress-dilatancy relationship of sands. However, the effect of over-consolidation on dilatancy properties of loose sand is not well understood; therefore, in this study, investigations on …
The Behavior Of Precipitates During Hot-Deformation Of Low-Manganese, Titanium-Added Pipeline Steels, Ali Dehghan-Manshadi, Rian J. Dippenaar
The Behavior Of Precipitates During Hot-Deformation Of Low-Manganese, Titanium-Added Pipeline Steels, Ali Dehghan-Manshadi, Rian J. Dippenaar
Faculty of Engineering - Papers (Archive)
The behavior of manganese and titanium sulfides during the hot deformation of a low-carbon, low-manganese, titanium-added steel has been studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS) analysis. In addition, the effects of deformation temperature and strain rate on the size and distribution of precipitates have been studied using an automatic inclusion analysis system. Also, the effect of precipitate distribution on mechanical properties was studied at different deformation conditions of temperature and strain rate. The TEM and SEM analyses revealed the presence of a wide variety of simple and/or complex precipitates in the as-cast …
Influence Of Hydrogen Content On Hot Deformation Behavior And Microstructural Evolution Of Ti600 Alloy, J W. Zhao, H Ding, H L. Hou, Z Q. Li
Influence Of Hydrogen Content On Hot Deformation Behavior And Microstructural Evolution Of Ti600 Alloy, J W. Zhao, H Ding, H L. Hou, Z Q. Li
Faculty of Engineering and Information Sciences - Papers: Part A
Isothermal hot compression tests of a Ti600 alloy after hydrogenation were carried out over the temperature range of 760 to 880℃ and strain rate range of 0.01 to 10 s-1. The influence of hydrogen content was studied on the flow stress and activation energy of deformation. The microstructural changes were examined by transmission electron microscopy (TEM). The results show that the addition of 0.3% hydrogen in Ti600 alloy can decrease the hot deformation temperature by 80 ◦C and increase the deformation strain rate by two orders of magnitude. Both the flow stress and activation energy of deformation of Ti600 alloy …