"In this project study was conducted with the goal of understanding the role of boron involved in structure-toughness property relationship for SO32 and SO43 steels. For a standard heat-treatment of austenitizing (1 hr.) at 1700°F, water quenching and 1 hr. tempering at 1150°F SO32 steel (with 37 ppm B) lacked in toughness, while SO43 steel (with 2 ppm B) showed good toughness. In both steels all the boron was present in the form of "soluble boron" i.e., Fe23 (B,C)6 borocarbide. Experiments were carried out to study the effect of various heat treatment parameters on the precipitation behavior of Fe23 (B,C)6. On austenitizing the Fe23 (B,C)6 borocarbide dissolved and on cooling it precipitated along the grain boundaries. This precipitation increased with tempering time and tempering temperature. The amount of precipitate in SO43 steel (2 ppm B) was relatively less. And since SO43 steel (2 ppm B) had better toughness the toughness of SO32 steel (37 ppm B) may be improved by reducing the precipitation of Fe23 (B,C)6 borocarbide. This may be done by reducing the tempering time and/or tempering temperature"--Abstract, page ii.
Kisslinger, Fred, 1919-2010
Bain, Lee J., 1939-
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
vi, 20 pages
© 1984 Sunil S. Moghe, All rights reserved.
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Moghe, Sunil S., "The role of boron in SO32 and SO43 steels" (1984). Masters Theses. 209.
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