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GRAIN COARSENING BEHAVIOR OF V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong , ZHU Jing Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China TANG Guoyi , Dept.of Graduates , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing 100081 , China

金属学报(英文版)

The effects of chemical composition and cooling rate after solidication on the grain coarsening temperature,T_(GC),of the V-Ti-N microalloyed steels have been investigated.It is shown that the T_(GC) may be obviously raised by adding even a little Ti to the base steel so as to pre- cipitate a great deal of fine Ti-bearing particles of about 10 nm.The T_(GC) does not increase with the cooling rate,as it is over a certain critical value.The T_(GC) is insensitive to any varia- tion of N content at simulated cooling condition of 150 mm continuous cast slab.The T_(GC) may be dropped down about 100℃ by adding 0.33 wt-%Mo to the steels.The sensitivi- ty of T_(GC) to cooling condition relates to the Ti and V contents.

关键词: microalloyed steel , null , null

MISCIBLE PRECIPITATES IN V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong ZHU Jing Central Iron and Steel Research Institute , Beijing , China ZHENG Yangzeng Professor , Department of Material Engineering , Yanshan University , Qinhuangdao , China

金属学报(英文版)

The characteristics and the formation of the miscible particles in V-Ti-N microalloyed steels were studied.It was found that the vanadium to form V-Ti miscible particles starts to precipi- tate after pouring and cooling to temperature below 11 50℃ by means of the epitaxial precipi- tation on the pre-existing titanium nitrides.The vanadium content in the particles is markedly influenced by the cooling rate after solidification.

关键词: microalloyed steel , null , null

BEHAVIOR OF FINE V-Ti COMPLEX CARBONITRIDE IN STEEL 09MnVTiN DURING REHEATING

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , China ZHU Jing CAI Qigong Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China

金属学报(英文版)

An investigation was carried out of the morphology and microstructure of V-Ti complex carbonitride in steel 09MnVTiN during reheating under analytical electron microscope.The prior V-rich ellipsoid V-Ti complex carbonitride particles are replaced progressively by Ti-rich cubic ones as the reheating temperature elevated from 1050 to 1400℃.The Ti con- tents in the core and border of particles increase from 15 and 6% in hot-rolled specimens into 84 and94% at 1400℃ respectively.

关键词: steel 09MnVTiN , null , null , null

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