Physical and Numerical Analysis of Extrusion Process for Production of Bimetallic Tubes Page: 82 of 108
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Fig. 4.56. High magnification of the interface between (left) 1020 steel and (right) 304
stainless steel after 2.5 h at 1200oC held at 100 lb-f in Gleeble Hydrawedge unit and
deformed to a strain of 2.74 at a strain rate of 22.8 s-' and air cooled. The sample was
etched with agitated 60 mL HCI, 60 mL HNO3, and 60 mL distilled H2O for 30 s.
(Fig. 4.48). The interface lacks the porosity and exhibits a martensite layer at the interface that is
approximately 25- to 30-pm thick.
Figure 4.57 shows the low strain/strain rate interface after being reheated to 1100 C and furnace
cooled. It can be observed that the microstructure closely resembles that from the actual extrudates
Fig. 4.57. Light optical micrograph of the interface between (left) 1020 steel
and (right) 304 stainless steel after 2 h at 1100oC held at 100 lb-f in Gleeble
Hydrawedge unit and deformed to a strain of 1.2 at a strain rate of 2.10 s
and air cooled. After cooling, it was reheated to 1100 C and furnace cooled.
The sample was etched with agitated 60 mL HC, 60 mL HNO3, and 60 mL
distilled H2O for 30 s.
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Misiolek, W. Z. & Sikka, V. K. Physical and Numerical Analysis of Extrusion Process for Production of Bimetallic Tubes, report, August 10, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc884646/m1/82/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.