Metallurgical Factors Influencing Hot Ductility of Austenitic Steel Piping at Weld Heat-Affected Zone Temperatures

[+] Author and Article Information
T. M. Cullen

Research Metallurgist, Research Center, The Babcock & Wilcox Company, Alliance, Ohio

J. W. Freeman

The University of Michigan, Ann Arbor, Mich.

J. Eng. Power 85(2), 151-164 (Apr 01, 1963) (14 pages) doi:10.1115/1.3675237 History: Received September 13, 1962; Online January 10, 2012


The variable hot ductility of wholly austenitic Type 347 steel was found to be associated with the variable temperature of formation of a liquid phase (liquation temperature) in the microstructure of the steel. In wholly austenitic materials a low liquation temperature leads to poor hot ductility. The liquation temperature of the steel was determined to be a function of its columbium, carbon, and nitrogen contents. When ferrite is present in the steel, poor hot ductility can also occur as a result of the crack sensitivity of the two-phased structure.

Copyright © 1963 by ASME
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