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
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null
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null
Y.F. Gao
,
J.Tan
,
G.D. Liu
,
C.L.Zhang
,
T.Liuand R.Z Ma (Rapidly Quenched Materials Research and Development Centre
,
Central Iron & Steel Research Institute
,
Beijing 100081
,
China)(Metal Physics Department
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)
金属学报(英文版)
A mostly single bcc phase with grain sizes of 15-20 nm was prepared by crystallization of amorphous Fe-P-C-Mo-Cu-Si alloys.The Bs value (H=10000 Oe) reaches 1.595 T for Fe(79.5) P(12)C6Cu(0.5)Mo(0.5)Si(1.5) alloys. The low core loss of 0.14 w/kg at 1.3 T and 50 Hz was confirmed for the bcc Fe(79.5)P(12)C6Cu(0.5)Mo(0.5)Si(1.5) alloy.The structures of the alloy annealed at different temperatures have been investigated by means of Xray diffraction and transmission electron microscope. The relationship between the structure and magnetic properties of the alloy is discussed.
关键词:
: amorphous alloy
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null
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CHENG Tianyi Beijing Institute of Technology
,
Beijing
,
ChinaCANTORB University of Oxford
,
UKMcLEANM FLOWERHM Imperial College
,
UK CHENG Tianyi
,
associate professor
,
Faculty of Metallography
,
Beijing Institute of Technology
,
Beijing 100081
,
China
金属学报(英文版)
In rapidly solidified Ni-34.6 at-% Al alloy,when the cooling the rate during solidification reached the order of 10~6 K/s,the size of the microstructures,such as the grains and substructure of the martensite,decreased dramatically.The various kinds of interfaces with high density and homogeneous distribution resisted effectively the propagation of the cracks and resulted in localized plastic deformation ahead of the tips of microcracks.The ductility and toughness at room temperature of the Ni-rich NiAl may be improved considerably.
关键词:
NiAl
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null
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null
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ZHAO Yu HE Zhongzhi WENG Yuqing WU Baorong Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China Doctorate Student
,
Department No.2
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
When Sn segregated at grain boundaries of high induction oriented silicon steel,no remarka- ble interaction between Sn and other elements was observed.At the starting temperature of secondary recrystallization,950℃,a certain Sn still segregates at grain boundaries.Sn seems to act as a supplemental inhibitor through grain boundary segregation.According to theoreti- cal analysis,an addition of Sn may decrease the secondary recrystallization temperature of high induction oriented silicon steel,and it is in agreement with the experimental result.
关键词:
silicon steel
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null
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null
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null
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null
ZHONG Jiaxiang QI Yan Beijing Institute of Technology
,
Beijing
,
ChinaZHANG Xiumu GUO Yunyi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Beijing Institute of Technology
,
Beijing 100081
,
China
金属学报(英文版)
A new “mid-relief” plate martensite was observed together with lenticular plate and thin plate martensites in Fe-29.37Ni-0.34C alloy after twice stepped cooling:-100/-120℃, -120/-140℃,-155/-165℃ and -165/-196℃,by means of colour metallography and TEM.The morphology of martensites changes with decreasing M_s temperature.The “mid-relief” plate martensite is characterized by the intensive mid-relie and the substructures of symmetric double twins or half twins and half dislocations,the formation of this martensite can be interpreted by a stress-induced co-generated mechanism.
关键词:
martensite
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null
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null
LI Jian SUN Fuyu Central Iron and Steel Research Institute
,
Beijing
,
China Engineer
,
Department No.4
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
The volume fraction of proeutectoid ferrite transformed from deformed austenite fv as a func- tion of isothermal time t has been investigated in 0.037% Nb microalloyed steel.The results show that lnln(1-fv)~(-1) vs Int relation does not follow the Avrami equation strictly and con- sists of two straight lines.By comparing the differences between the results and Cahn's theory, the authors' idea has been expounded.
关键词:
austenite deformation
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null
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null
MA Peili YUAN Ying ZHONG Zengyong Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China MA Peili Senior Engineer
,
Lab.of Superalloy
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
By adding small amount of Mg to the wrought superalloys,the steady stage of creep,and es- pecially the tertiary stage of creep are prolonged.Also,the steady creep rate is decreased within the range of low strain rates.At higher strain rates,however,the effect of Mg on creep rate vanishes.This may be attributed to the Mg dissolution in the matrix.A mechanism of the effects of Mg addition on creep behaviors is proposed.
关键词:
Mg microalloying
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null
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null
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null
XU Wenchong SUN Fuyu Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China XU Wenchong Senior Engineer
,
Dept.No.13
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
The lattice constants and chemical composition of Ti,Nb and V precipitates with different particle sizes have been measured hy means of CBED and EDAX.It was obtained that the concentration ratio Of Nb and V,C_(Nb)/C_V,and the lattice constants in the Nb-V steel de- crease with the decrease of the particle size of the precipitates,but there is no regularity for tattice constant of Ti,N b and V precipitate against their particle size in the Ti-V-Nb steel.
关键词:
microalloyed steel
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null
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null
