TY - GEN
T1 - Substructure and crystallography of degenerate pearlite in an Fe-C binary alloy
AU - Furuhara, T.
AU - Moritani, T.
AU - Sakamoto, K.
AU - Maki, T.
PY - 2007
Y1 - 2007
N2 - Microstructures formed by degenerate pearlite transformation in an Fe-0.38mass%C alloy were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Degenerate pearlite which contains fine cementite particles even at the growth front was observed with other structures such as proeutectoid ferrite, lamellar pearlite and bainite in a temperature range between 773K and 923K. As the isothermal transformation temperature is lowered, a fraction of the degenerate pearlite increases. The degenerate pearlite consists of 'block' (a region in which ferrite orientations are nearly the same) and 'colony' (a region containing cementite particles of nearly the same orientation), both of which are similar to those in lamellar pearlite. Block boundaries within an austenite grain are generally of high-angle type and their misorientations deviate largely from intervariant relationships for the K-S orientation relationship. In contrast, colony boundaries are of low-angle type. Cementite films are formed along those ferrite boundaries in the degenerate pearlite, presumably formed by encounter of the blocks or colonies.
AB - Microstructures formed by degenerate pearlite transformation in an Fe-0.38mass%C alloy were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Degenerate pearlite which contains fine cementite particles even at the growth front was observed with other structures such as proeutectoid ferrite, lamellar pearlite and bainite in a temperature range between 773K and 923K. As the isothermal transformation temperature is lowered, a fraction of the degenerate pearlite increases. The degenerate pearlite consists of 'block' (a region in which ferrite orientations are nearly the same) and 'colony' (a region containing cementite particles of nearly the same orientation), both of which are similar to those in lamellar pearlite. Block boundaries within an austenite grain are generally of high-angle type and their misorientations deviate largely from intervariant relationships for the K-S orientation relationship. In contrast, colony boundaries are of low-angle type. Cementite films are formed along those ferrite boundaries in the degenerate pearlite, presumably formed by encounter of the blocks or colonies.
KW - Interphase boundary precipitation
KW - Pearlite
KW - Phase transformation
KW - Steel
UR - http://www.scopus.com/inward/record.url?scp=38349170453&partnerID=8YFLogxK
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U2 - 10.4028/0-87849-428-6.4832
DO - 10.4028/0-87849-428-6.4832
M3 - Conference contribution
AN - SCOPUS:38349170453
SN - 0878494286
SN - 9780878494286
T3 - Materials Science Forum
SP - 4832
EP - 4837
BT - Supplement to THERMEC 2006, 5th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2006
PB - Trans Tech Publications Ltd
T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
Y2 - 4 July 2006 through 8 July 2006
ER -