JIANG Qichuan
,
YAN Jiulin
,
GUAN Qingfeng
,
WANG Shoushi
,
RONG Fujie
,
LI Zhang Jilin University of Technology
,
Changchun
,
China 130025
,
China associate professor
,
Jilin University of Technology
,
Changchun
金属学报(英文版)
By calculation of thermodynamics,analysis of crystal structure and study of TEM and eletron probe,it is first discovered that SiO2 can be acted as one of the heterogeneous nu- clei for lamellar intergorowth eutectic(austenite and cementite)crystallizing in modified as-cast medium manganese steel.
关键词:
SiO_2
,
null
,
null
,
null
MA Genxiang LI Deqian Changchun Institute of Applied Chemistry
,
Academia Sinica
,
Changchun
,
China Changchun Institute of Applied Chemistry
,
Academia Sinica
,
Changchun
,
Jilin
,
China
金属学报(英文版)
The synergistic extraction of Cd(Ⅱ)with primary amine N-1923 and neutral organophosphorus reagents(TBP,DBBP,B)from hydrochloric acid has been investigated at μ=0.5,t=25℃.The compositions of the synergistic extraction complexes and the mechanism of the synergistic extraction have been determined by the methods of slope and constant mole. The synergistic extraction complexes with composition(RNH_3Cl)_2·CdCl_2·B have been demonstrated.The synergistic extraction reactions and additional reaction of Cd(Ⅱ)have been proposed as follows: CdCl_2+2RNH_3Cl_(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o) (RNH_3Cl)_3·CdCl_(2(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o)+RNH_3Cl_(o) In addition,the equilibrium constants and the thermodynamic functions of the synergistic ex- traction reactions have been calculated.The IR and NMR spectra of the synergistic ext-ac- tion complexes of Cd(Ⅱ)have been studied as well.
关键词:
primary amine
,
null
,
null
,
null
Xianzhang BU Fine Mech.Mater.and Technol.Dept.
,
Changchun Institute of Optics and Fine Mechanics
,
Changchun
,
130022
,
ChinaHongying WANG Zhang LI Jiandong HU Microanalysis Center
,
Jilin University of Technology
,
Changchun
,
130025
,
China
材料科学技术（英）
The microstructure of the laser melted 1.0%C tool steel have been investigated.The region affected by the laser can be subdivided into 3 zones,which consist of a melted region at the surface,a zone with solid state transformation and the area adjacent to the unaffected substrate where cementite is slightly dissolved.The melted zone possessed a cellular growth morphology consisting of austenite and martensite.The carbon content of the austenite was measured to be over 1 wt-%.A great deal of retained austenite and twinned martensite were found in the first two zones(the melted and solid transformed).
关键词:
laser process
,
null
,
null
JIN Man
,
JIANG Zhonghao
,
NAN Shenghui
,
HU Jiandong
,
LIAN jianshe(Jilin University of Technology
,
Changchun
,
China)(Manuscript received 8 February 1995)Correspondent:LI Geping
,
(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)
金属学报(英文版)
The low carbon dual phase structure was cold de formed first,then was tempered at 200 to 600℃.The variation in strength and ductility during tempering of the steel was investigated.It was found that a fter the de formed dual phase structure was tempered at 200 to 600℃, with the increase in the tempering temperature the tensile strength decreases rapidly;the lotal elongation remains constant at 200 to 500℃ but began to rise dramatically at a critical temperature between 500 and 600℃.However,when the non-deformed dual phase structure was tempered at the same temperature range,the tensile strength decreases and the total elongation increases continuously with the increase of temperature.It was demonstrated from TEM analysis that precipitating carbides density along the boundaries ofmartensite lath and the recrystallized grains are responsible for the tempering response ofthe de formed dual phase structure.
关键词:
:de formed dual phase structure
,
null
,
null
LI Jing HUANG Kexiong WANG Zaoji LIU Jun Central South University of Technology
,
Changsha
,
ChinaGUO Chuntai Changchun Institute of Applied Chemistry
,
Academia Sinica
,
Changchun
,
China LI Jing Professor
,
Faculty of Metallurgical Physical Chemistry
,
Central South University of Technology
,
Changsha 410012
,
China
金属学报(英文版)
Interfacial tension between liquid Al and molten fluoride salt was determined using sessile drop method combined with X-ray radiograph.A computer program of curve-fitting for coordination of configuration of sessile drop was used in the picture processing of the sessile drop.Regressive equation were worked out to calculate the density of the molten salt.The in- fluence of mole ratio of NaF/AlF_3,content of Li_2CO_3 and rare-earth oxides in the molten salt on interfacial tension of Al-salt was discussed.The contact angles of liquid Al on the sur- face of graphite,graphitized carbon cathode and the graphite with coating of TiB_2 were de- termined.
关键词:
interfacial tension
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null
,
null
,
null
XU Yongbo HA Kuanfu WANG Zhongguang YANG Chunsong DAI Zhongling Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.Jilin University
,
Changchun
,
130023
,
China.To whom correspondence should be add
材料科学技术（英）
An investigation has been made of the disloca- tion distribution and dislocation free zone near the crack tip in bulk Fe-3% Si single crystal during deformation in SEM.It has been found that a number of dislocations were emitted from the crack tip during deformation.After that,the dislocations moved rapidly away from the crack tip,which indi- cated that they were strongly repelled by the stress field at the crack tip.Between the crack tip and the plastic zone there is a region of dislocation-free, which is referred to as dislocation-free zone (DFZ). The length of DFZs is roughly estimated 100 μm which is much longer than that found in thin foil specimen.The variation of dislocation density as a function of the distance from the crack tip was measured,which showed that the dislocations are inversely piled up in the plastic zone.The length of DFZs increased with both the length of pre-crack and the amplitude of applied stress.
关键词:
dislocation
,
null
,
null
,
null
GUO Chengyan Jilin Institute of Technology
,
Changchun
,
ChinaGOTO Takashi HIRAI Toshio Tohoku University
,
Japan Associate Professor
,
Department of Materials Engineering
,
Jilin Institute of Technology
,
Changchun 130012
,
China
金属学报(英文版)
Investigation was made of the deposited rate,surface morphology and crystal pre- ferred orientation of the dense TiC coating onto austenitic stainless steel in relation with CH_4/TiCl_4 mole ratio and temperature adopted in CVD processing. When the CH_4/TiCl_4 ratio is low or high,the preferred orientation may be(220)or(200),respec- tively,which is mainly dependent on the equilibrium concentration of active C in vapour phase.
关键词:
preferred orientation
,
null
,
null
JIANG Qichuan HE Zhenming YAN Jiulin CUI Donghuan WANG Shoushi Jilin University of Technology
,
Changchun
,
China JIANG Qichuan Associate Professor
,
Faculty of Casting Technology
,
Jilin University of Technology
,
Changchun 130025
,
China
金属学报(英文版)
The needle-like and network carbides in as-cast high carbon wear-resistant manganese steels will be nodularized and dispersed,by a large majority,in austenite aider modifying treatment with Mg system agents.The impact toughness of the steels is significantly improved and the hardness is also increased to a certain extent.As a result,the steels can be used in as-casted state without any heat treatment and their wear resistance can be greatly enhanced.
关键词:
Mg modification
,
null
,
null
