Flow Experiments Inside Welded Steel Pipe
The time of issue:2014-10-8 11:56:13 Author:
The next micrograph of
welded steel pipe represents detailed structure after the same heat treatment. Due to this reason, the relative large austenite grain may exhibit specific diffraction contrast, which can be easily depicted. This specific contrast of cutting edge welding technology may result either from welded steel pipe or other stacking faults. Apart from these defects, we may see a range of numerous dislocation and dislocation loops in a set of parallel ferrite laths. At the same time, there are many dislocations where retained austenite is located along these laths. The flow experiments can be conducted in small channels inside welded steel pipe. Thus, the flow will be dominated by inertia due to cutting edge welding technology and buoyancy effects are small as a result. Consequently, gravity does not play a role as it does for the well known bubble accumulation inside welded steel pipe. Instead, the trapping of particles may be combined with the phenomenon of bubble movement toward the center of vortices. Similar scenes can be well observed in turbulent flows with the help of cutting edge welding technology since vortex breakdown phenomenon in the junction has been described. As is already mentioned, the pressure distribution can be changed with cutting edge welding technology and it plays a critical role for this scenario. This is also the case for the accumulation of cutting edge welding technology in the vortex structures as well as the turbulent flow.
However, the key difference is that in the previous observations of welded steel pipe trapping since effects of cutting edge welding technology can be rather evident due to gravity. At the same time, the hydrostatic pressure gradient and the resulting rise velocity are needed to explain the trapping in a vortex. As we have stated at the very beginning, the aim is to compare low alloy steel and welded steel pipe in term of their structures. This is because cutting edge welding technology can be obtained after tempering although the parameters of heat treatment may be related to temperature and time of isothermal quenching. First of all it can be assumed that cutting edge welding technology has a special mechanism due to austenite decomposition. The whole process is generally very similar although the temperature of welded steel pipe quenching is different. As we can see from the micrograph, the structure of alloy steel and other kinds of steel pipes are qualitatively similar. In terms of the piping materials, steel and matrix consist of mixture ferrite plus carbon stabilized austenite even though the size of ferrite is much less than the latter. It looks that the dispersion of ferrite is at least five or even more time than previous products due to cutting edge welding technology.
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