TY - JOUR
T1 - Recrystallization control of dilute molybdenum-titanium alloys by multi-step internal nitriding
AU - Nagae, Masahiro
AU - Takada, Jun
AU - Takemoto, Yoshito
AU - Hiraoka, Yutaka
AU - Yoshio, Tetsuo
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000
Y1 - 2000
N2 - The control of microstructure and recrystallization temperature in the internally nitrided dilute Mo-Ti alloys was studied through a novel three-step nitriding process at 900 to 1600 °C in N2 gas, in order to develop highly ductile Mo alloys having a heavily deformed microstructure near the specimen surface. Primary internal nitriding process below the recrystallization temperature of the present alloys at around 1000 °C brings uniform dispersion of superfine Ti-nitride precipitates in the Mo matrix where the deformation microstructure remains. These superfine precipitates decompose and disappear after heating at 1200 °C in a vacuum. However, after secondary nitriding at 1500 °C in a nitrogen atmosphere, those particles grew up to be stick-shaped particles with a length of 50 to 120 nm without the recrystallization of Mo matrix within about 130 μm from the specimen surface. The depth of the region where the recrystalization of Mo matrix was suppressed was greatly dependent upon the secondary nitriding temperature. The third nitriding was conducted at 1500 or 1600 °C. For the specimen nitrided at 1600 °C, the recrystallization temperature in a vacuum was elevated above 1600 °C.
AB - The control of microstructure and recrystallization temperature in the internally nitrided dilute Mo-Ti alloys was studied through a novel three-step nitriding process at 900 to 1600 °C in N2 gas, in order to develop highly ductile Mo alloys having a heavily deformed microstructure near the specimen surface. Primary internal nitriding process below the recrystallization temperature of the present alloys at around 1000 °C brings uniform dispersion of superfine Ti-nitride precipitates in the Mo matrix where the deformation microstructure remains. These superfine precipitates decompose and disappear after heating at 1200 °C in a vacuum. However, after secondary nitriding at 1500 °C in a nitrogen atmosphere, those particles grew up to be stick-shaped particles with a length of 50 to 120 nm without the recrystallization of Mo matrix within about 130 μm from the specimen surface. The depth of the region where the recrystalization of Mo matrix was suppressed was greatly dependent upon the secondary nitriding temperature. The third nitriding was conducted at 1500 or 1600 °C. For the specimen nitrided at 1600 °C, the recrystallization temperature in a vacuum was elevated above 1600 °C.
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U2 - 10.2320/jinstmet1952.64.9_747
DO - 10.2320/jinstmet1952.64.9_747
M3 - Article
AN - SCOPUS:0033661329
VL - 64
SP - 747
EP - 750
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 9
ER -