[PDF] Top 20 Spheroidization of Low Carbon Steel Processed by Equal Channel Angular Pressing

... As the annealing temperature is further increased to 873 K and 973 K, the spheroidized cementites and ferrite grains were observed to coarsen (Fig. 6). The annealing time was also 1 hour. A SEM micrograph of the sample ... See full document

... SIMA consists of two steps, a strain-induced step and a melt-activated step. For the strain-induced step, different processes such as rolling, forging, upsetting and extrusion can be used. The main restriction of all of ... See full document

... equiaxed grain structure is not simple when the orientation image after 2 passes shown in Fig. 3(b) is inspected. It has a similar orientation throughout the observed area, suggesting that the structure consists of ... See full document

... very low (at " less than 0:03) and essentially same for all the alloys with different deformation history, but increase rapidly with further straining and become constant over the wide range of ... See full document

... stainless steel sheets have high corrosion resis- tance and high ...less steel, they are immune to stress corrosion cracking (SCC) in the chemical media, including ...stainless steel sheets. Unlike ... See full document

... of carbon can be achieved by a limited number of methods, among which is the ultrafine-grained (UFG) structure formation, especially efficient with the use of severe plastic deformation (SPD) processing that ... See full document

... The high density of dislocations observed, suggests a grain refinement mechanism linked to recovery and continuous dynamic recrystallization processes (transformation of sub- grains into new grains), which are controlled ... See full document

... Equal-channel angular pressing (ECAP) is a severe plastic deformation process (SPD) that use to obtain ultrafine grain ...at low homologous ... See full document

... a low carbon steel even when the number of revolution and applied pressure are the ...is processed by multidirectional deformation 2,5,7,8,14,22) but the sample is never deformed by ... See full document

... Equal channel angular pressing (ECAP) process provides an efficient procedure for achieving ultrafine grained microstructures with excellent mechanical properties in metallic ...IF ... See full document

... an angular channel at 110 o ...for channel angle Ф=90º, but the strain in-homogeneity is also ...for channel angles, Ф=110º, 115º, 120º. Hence the channel angle of Ф=110º is chosen for ... See full document

... then angular extruded at room ...tool steel (H13), which were held together to form a single internal channel having the same square cross ...internal channel was lubricated with MoS 2 powder ... See full document

... little higher than the initial state due to finer grain sizes, although lower than the lower temperature ECAP processed magnesium. It is also expected that the bimodal micro- structure induces strain hardening ... See full document

... Microstructural characterization of specimen before and after ECAP was performed using Optical Microscope (OM). Specimens for optical microscopy (OM) were obtained by sectioning the processed samples perpendicular ... See full document

... where a sample is pressed through a channel having an equal cross-section but bent into an L-shaped configuration in a die. 6) A large shear strain is introduced in the sample when the material passes ... See full document

... In assessing the overall effect of grain refinement by ECAP on the corrosion properties of copper, the following major outcomes of the tests can be reported. From the thermody- namic viewpoint both potentials (the ... See full document

... the steel after ECAP and HT: the average size of ferritic sites decreases, the process of carbides dispersion continues, accompanied by their spheroidizing and ... See full document

... It is important to mention that, the microstructure is not completely homogeneous and zones with dislocation cells are still observed even at 5 passes, coexisting with zones where large misorientation boundaries exist. ... See full document

... Equal channel angular pressing (ECAP) is a viable forming procedure to extrude material by use of specially designed channel dies without a substantial change in geometry and to make an ... See full document

... process: equal channel multi angular pressing (ECMAP), 11) T shaped ECAP (T-ECAP), 12) Cross shaped ECAP (Cross-ECAP), 13) rotary die ECAP, 14,15) ECAP combined with rolling: cold rolling and ... See full document