TY - JOUR
T1 - Identification of carbonitride precipitates in a 1wt.%Cr0.5wt.%Mo steel using analytical electron microscopy
AU - Lee, Y. J.
AU - Miller, P. R.
AU - Muddle, B. C.
PY - 1991/1/10
Y1 - 1991/1/10
N2 - The initial stages of carbonitride precipitation, in a normalized 1wt.%Cr0.5wt.%Mo steel subjected to isothermal heat treatment at 600 and 650°C, have been studied using electron microdiffraction, energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy. In the asnormalized steel, fine-scale (100 nm) equiaxed particles of f.c.c. CrN (a = 0.414 nm) have been identified at ferrite grain boundaries. With isothermal aging, an apparently continuous change in composition is observed in these grain boundary particles, forming firstly cubic close-packed carbonitrides (Cr, Mo) (N, C), followed by a transition to h.c.p. (Mo, Cr)2 (C, N) and eventual formation of Mo2C. Within the ferrite grains, short elliptical precipitate rods are detectable in extraction replicas from specimens aged for 25 h at 650 °C. These particles have been identified as h.c.p. Mo2C. No significant changes in composition or structure were observed to accompany the growth of these intraferritic particles during isothermal aging.
AB - The initial stages of carbonitride precipitation, in a normalized 1wt.%Cr0.5wt.%Mo steel subjected to isothermal heat treatment at 600 and 650°C, have been studied using electron microdiffraction, energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy. In the asnormalized steel, fine-scale (100 nm) equiaxed particles of f.c.c. CrN (a = 0.414 nm) have been identified at ferrite grain boundaries. With isothermal aging, an apparently continuous change in composition is observed in these grain boundary particles, forming firstly cubic close-packed carbonitrides (Cr, Mo) (N, C), followed by a transition to h.c.p. (Mo, Cr)2 (C, N) and eventual formation of Mo2C. Within the ferrite grains, short elliptical precipitate rods are detectable in extraction replicas from specimens aged for 25 h at 650 °C. These particles have been identified as h.c.p. Mo2C. No significant changes in composition or structure were observed to accompany the growth of these intraferritic particles during isothermal aging.
UR - http://www.scopus.com/inward/record.url?scp=0026066167&partnerID=8YFLogxK
U2 - 10.1016/0921-5093(91)90351-M
DO - 10.1016/0921-5093(91)90351-M
M3 - Article
AN - SCOPUS:0026066167
SN - 0921-5093
VL - 131
SP - 123
EP - 132
JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1
ER -