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EFFECT OF LIQUID FLOW ON PRIMARY ARM SPACING OF CONSTRAINED COLUMNAR CRYSTALS

LIU Shan LU Deyang HUANG Tao ZHOU Yaohe National Lab of Solidification Processing , Northwestern Polytechnical University , Xi'an , China LIU Shan , lecturer , National Laboratory of Solidification Processing , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

An experimental apparatus,which has a convection generator and an aid-heater,is developed for the study of the effect of stable laminar liquid flow on the directional solidification process by the use of transparent alloy SCN-2wt-% Ace.The flow is perpendicular to primary arms. By in-situ observatio...

关键词: forced liquid flow , null , null , null

INTERFACE MORPHOLOGIES AND MICROSTRUCTURES DURING DENDRITE-TO-CELL TRANSITION AT HIGH GROWTH RATE

LI Jianguo MAO Xiemin FU Hengzhi National Laboratory of solidification Technology , Northwestern Polytechnical University , Xi'an , China Lecturer.Faculty No.403 , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

The interface morphologies and microstruetures of the directionally solidified Ni-5wt-% Cu alloy during dendrite-to-cell transition at high growth rates have been investigated with a newly developed apparatus for unidirectional solidification with the temperature gradient at the solid/liquid interfa...

关键词: cellular growth , null , null , null , null

EFFECT OF β-FLECKS ON MECHANICAL PROPERTIES OF Ti-10V-2Fe-3Al ALLOY

ZHOU Yigang YU Hanqing ZENG Weidong Northwestern Polytechnical University , Xi'an , ChinaTANG Jialin China South Aviation Motive Power and Machinery Company , Zhuzhou , China professor , Department of Materials Science and Engineering , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

Effect of β-flecks on properties of tensile elongation and low cycle.fatigue life at room tern. perature for Ti-10V-2Fe-3Al alloy has been investigated.The cracks along initial β-grain boundaries in the β-fleck region may propagate to form intergranular brittle fracture.Under alternating load,the β-...

关键词: Ti-10V-2Fe-3Al alloy , null , null , null

MICROSTRUCTURE AND MORPHOLOGY OF HIGH MANGANESE NON-MAGNETIC STEEL

YANG Yanqing MA Shiliang QIN Xiongpu KANG Mokuang Northwestern Polytechnical University , Xi'an , China YANG Yanqing , Graduate student , Dept.of Materials Science and Engineering , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

Two types of lath structures and kinked ε martensite were observed in the high manganese non-magnetic steel.Both the short non-continuous lath formed by quenching and the long thin straight lath induced by plastic deformation are composed of ε martensite and fcc twin. The transformation mechanism wa...

关键词: εmartensite , null , null , null

TEMPERED BAINITE EMBRITTLEMENT IN SOME STRUCTURAL STEELS

HU Guangli LIU Zhengtang WANG Ping HUA Wenjun KANG Mokuang Northwestern Polytechnical University , Xi'an , China HU Guangli , Associate Professor , Department of Materials Science and Engineering , Northwestern Polytechnical University , Xi'an , China

金属学报(英文版)

The variations of microstructures and mechanical properties of steels 15CrMnMoV, 18Mn2CrMoB,18Cr2Ni4W,30CrMnSi,30CrMnSiNi2 and 40CrMnSiMoV,which were tempered at different temperatures after austempering and continuous cooling at given rates, have been investigated.Based on the experimental results,...

关键词: austempering , null , null

RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS

LIU Lin FU Hengzhi SHI Zhengxing Northwestern Polytechnical University , Xi'an , China Dr.LIU Lin Lecturer , Department of Applied Physics , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

The SEM analysis of decply etched specimens of Ni-base superalloys K38 and K19H+Ta in- dicates that both the primary morphologies under normal growth conditions and the final morphologies near equilibrium of MC carbides are octahedral blocks.The classification of MC crystal faces by means of PBC(Per...

关键词: carbide , null

NONSTABLE GROWTH OF Al-Si EUTECTIC IN CONSTRAINED CONDITION

LIU Junming ZHOU Yaohe SHANG Baolu Northwestern Polytechnical University , Xi'an , China LIU Junming P.O.Box No.219 , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

Nonstable growth of Al-Si eutectic in constrained condition has been investigated by means of change of the withdrawing rate in an unidirectional solidification system,In constant acceleration growth,a retarded effect of response of eutectic interflake spacing on the growth rate has been observed.Th...

关键词: Al-Si eutectic , null , null

IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION

TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical University.Xi'an , China Associate Professor , Department of Materials Science and Engineering , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

In Situ observation of deformation and fracture for superalloy GH169 under combined fatigue-creep action is made by using high temperature metalloscope,it is shown that under the test conditions the deformution takes place by merely of slipping,twinning and grain houndary sliding,and the mode of fai...

关键词: combined fatigue-creep action , null , null , null

CCT-DIAGRAMS OF Si-Mn-Mo BAINITIC STEELS

LIU Xiao ZHANG Mingxing CHEN Daming ZHOU Lubin KANG Mokuang Northwestern Polytechnical University , Xi'an , China LIU Xiao Faculty No.401 , Northwestern Polytechnical University , Xi'an 710072 , China

金属学报(英文版)

CCT-diagrams of Si-Mn-Mo bainitic steels have been determined.With Mo 0.25%,the high-temperature transformation of the steel shifts large to the right,and the bainitic trans- formation region becomes a“flat topped C-curve”at cooling rate in wide range.Si in the steel may cause shift of the bainitic ...

关键词: meta-bainite , null , null

MODELING STUDY OF CONVECTION AND CONSTITUTION VARIATION IN INGOT DURING SOLIDIFICATION

JIE Wanqi ZHOU Yaohe Northwestern Polytechnical University , Xi'an , China JIE Wanqi Department of Materials Science and Technology , Northwestern Polytechnical University , Xi'an , China

金属学报(英文版)

Convection and constitution variation of liquid metal during solidification has been studied us- ing NH_4Cl aqueous solution.The liquid in mushy zone attached to the side wall of the mold will flow upward and form a low concentration region,in which no significant convection oc- curs,on the top of l...

关键词: liquid zone , null , null , null

材料期刊网

EFFECT OF LIQUID FLOW ON PRIMARY ARM SPACING OF CONSTRAINED COLUMNAR CRYSTALS

INTERFACE MORPHOLOGIES AND MICROSTRUCTURES DURING DENDRITE-TO-CELL TRANSITION AT HIGH GROWTH RATE

EFFECT OF β-FLECKS ON MECHANICAL PROPERTIES OF Ti-10V-2Fe-3Al ALLOY

MICROSTRUCTURE AND MORPHOLOGY OF HIGH MANGANESE NON-MAGNETIC STEEL

TEMPERED BAINITE EMBRITTLEMENT IN SOME STRUCTURAL STEELS

RELATIONSHIP BETWEEN PRIMARY MORPHOLOGY AND CRYSTAL STRUCTURE OF CARBIDES GROWING IN SUPERALLOYS

NONSTABLE GROWTH OF Al-Si EUTECTIC IN CONSTRAINED CONDITION

IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION

CCT-DIAGRAMS OF Si-Mn-Mo BAINITIC STEELS

MODELING STUDY OF CONVECTION AND CONSTITUTION VARIATION IN INGOT DURING SOLIDIFICATION

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