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Deformation behavior of a modified 9Cr-1Mo steel between 77 and 373 K

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Title Deformation behavior of a modified 9Cr-1Mo steel between 77 and 373 K
 
Creator KISHORE, R
SINGH, RN
SINHA, TK
KASHYAP, BP
 
Subject alloys
 
Description Tensile samples of a modified 9Cr-1Mo steel after tempering at 823 and 983 K subsequent to a normalizing treatment at 1373 K (designated as 550T and 710T, respectively) were deformed in tension at temperatures in the range of 77 to 373 K both by constant initial strain-rate tests at (epsilon) over dot = 1.1 . 10(-4)/s and strain-rate change tests between 1.1 . 10(-4) and 1.1 . 10(-3)/s at epsilon(tot) = 0.05, 0.07, 0.1, 0.12, and 0.14. The 710T specimens showed an increase in ductility and a marginal increase in strength with decreasing test temperature, whereas the 550T specimen exhibited an increased flow stress with very low ductility. The thermal component of flow stress (tau*), the activation volume (upsilon*) and activation energy (Delta H) were strongly affected by the microstructure. A decrease in tau* observed in the 710T specimens, compared with that of pure iron, at temperatures below 200 K can be attributed to solid solution softening by the dissolved nitrogen atoms. Further, the variations in upsilon* and Delta H with stress and temperature supports the importance of the Peierls mechanism for plastic deformation, and the movement of dislocations by double kink formation was found to be strongly affected by free nitrogen atoms.
 
Publisher CARL HANSER VERLAG
 
Date 2011-07-19T12:42:57Z
2011-12-26T12:51:13Z
2011-12-27T05:37:43Z
2011-07-19T12:42:57Z
2011-12-26T12:51:13Z
2011-12-27T05:37:43Z
1998
 
Type Article
 
Identifier ZEITSCHRIFT FUR METALLKUNDE, 89(9), 629-634
0044-3093
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5303
http://hdl.handle.net/10054/5303
 
Language en