Deformation Inhomogeneities in Upset Forging

2009 ◽  
pp. 24-24-16 ◽  
Author(s):  
P Dadras ◽  
JF Thomas
Keyword(s):  
Upset Forging

Effects of over Heat and Casting Speed on Quality of GCr15 Billet

2014 ◽  
Vol 997 ◽  
pp. 534-537 ◽  
Author(s):  
Qi Wei Zuo ◽  
Xia An ◽  
Jing Bo Yang ◽  
Da Qiang Cang
Keyword(s):  
Casting Speed ◽  
The Other ◽  
Steel Making ◽  
Average Grade ◽  
Upset Forging ◽  
C 30 ◽  
Better Than ◽  
Center Porosity

In order to improve the quality of the billets, the whole test proceedings by the comparison of the two casting conditions which one is over heat 20°C-30°C under casting speed 0.4m/min-0.6m/min and the other is over heat 10°C-15 °C under casting speed 1.3m/min-1.6m/min are checked during the produce process of GCr15 in some domestic steel-making plant. The results show that the average grade of general porosity decreases 1.0, the average grade of center porosity down 0.5, the average grade of center segregation fall 0.5 and the samples tested in hot upset forging perform better than before. According to the results, the latter is determined to be accepted.

The profile of billets in upset forging

1983 ◽  
Vol 23 (4) ◽  
pp. 191-199 ◽  
Author(s):  
P.F. Thomson ◽  
Myoe Aung
Keyword(s):  
Upset Forging

Microstructural and Magnetic Improvements in Tube-Cast Pr-Fe-B-Cu Alloys Via Heat Treatments and Rapid Upset Forging

1999 ◽  
Vol 577 ◽  
Author(s):  
G P Hatch ◽  
A J Williams ◽  
I R Harris
Keyword(s):  
Magnetic Properties ◽  
Heat Treatments ◽  
Cast State ◽  
Steel Tubes ◽  
Cu Alloys ◽  
Upset Forging ◽  
Cast Alloys ◽  
Optimum Heat ◽  
Alternative Routes ◽  
Optimum Heat Treatment

ABSTRACTAlloys of Pr-Fe-B-Cu were cast into Cu and stainless steel tubes. It could be seen that a preferred crystallographic orientation was obtained after cooling. Fine platelets of Pr2Fe1 4B matrix phase were formed, surrounded by various grain boundary phases, and there was a significant reduction in the amount of free Fe present, in comparison to conventional slab cast alloys. In order to improve the magnetic properties in the as-cast state, two alternative routes were used. The first involved a series of two step heat treatments to develop an improved microstructure. After an optimum heat treatment of 1000 'C for 24 hours + 500°C for 3 hours, significantly improved magnetic properties were obtained for a 17.5 % Pr alloy; Br = 752 mT, Hci = 613 kAm−1 and BHmax = 96 kJm−3. The second route involved a rapid upset forging [RUF] process, with a strain rate of 11.5 s−1, to hot deform the alloys. Following post-forging heat treatments, properties of Br = 966 mT, Hci = 780 kAm−3 and BHmax = 160 kJm−3 were obtained for a 15% Pr alloy. That nature of the improvements in properties as a result of heat treatments and RUF were investigated and are discussed in the present work.

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