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LASER GLAZING OF Ni-Nb AND Ni-Nb-Cr ALLOYS AND CORROSION RESISTANCE OF AMORPHOUS LAYERS

YAN Yuhe YANG Yongqiang ZHAO Changming Tianjin Institute of Textile Science and Technology , Tianjin , ChinaWU Weitao WANG Maocai Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , ChinaLU Mengfu Tianjin Institute of Science and Technology , Tianjin , China Lecturer , Laser Processing Lab. , Tianjin Institute of Textile Science and Technology , Tianjin 300160 , China

金属学报(英文版)

Partially amorphous Ni-Nb alloy was made by 1.91 kW cw CO_2 laser melt-quenching, and fully amorphous by 4.5 kW and 4.9 kW.The corrosion resistance of the amor- phous layer was improved by adding Cr.Potentiodynamic polarization curves show that the amorphous Ni_(50)Nb_(40)Cr_(10) is in more corrosio...

关键词: Ni-Nb allay , null , null

MODEL FOR INFILTRATION KINETICS OF LIQUID METALS AND ITS APPLICATION

XIA Zhenhai Hebei Institute of Technology , Tianjin , ChinaMAO Zhiying ZHOU Yaohe Northwestern Polytechnical University , Xi'an , China Doctor , Faculty of Foundry , Department of Mechanical Engineering No.2 , Hebei Institute of Technology , Tianjin 300132 , China

金属学报(英文版)

On the basis of fluid kinetics,a model for infiltration kinetics of liquid metals into fibre pre- fabricated composite has been proposed.The infiltration processing,together with the measurements of infiltrating velocity and permeability,for the C fibre-reinforced Al matrix composites have been stud...

关键词: liquid metal , null , null

THE MARTENSITIC TRANSFORMATION IN(Y,Mg)-PSZ CERAMICS

DAI Zurong LI Baocheng Taiyuan Institute of Mechanical Engineering , Taiyuan , ChinaWU Houzheng CHEN Yuru LIU Wenxi Tianjin University , Tianjin , China

金属学报(英文版)

A dynamic process of the martensitic transformation in(Y,Mg)-PSZ ceramics was observed in situ using TEM.Under the effect of contact stress between tetragonal(t)-ZrO_2 precipi- tates,a group of substructural martensite variants may occur priorly and then another one was induced by the elastic strain...

关键词: ceramics , null , null

GRAPHITE NUCLEI IN CAST IRON UNDER INOCULATION TREATMENT

WAMG Chunqi YANG Jiguang Tianjin University , Tianjin , China associate professor , Faculty of Foundry , Tianjin University.Tianjin 300072 , China

金属学报(英文版)

Melted cast iron was inoculated by FeSi,then quenched to interrupt the dissolution, the non-metallic inclusions,in which the graphite phase was already occured,formed in the dissolution region,They dissolved into the melt soon,but the inclusions coated by graphite could exist for along time.The func...

关键词: inoculation , null , null

550 AND 450°C ISOTHERMAL SECTIONS OF Fe-Ni-C PHASE DIAGRAM

GONG Fangyuc Tianjin University , Tianjin , China JI GOLDSTEIN LChigh University Bethlchem , U.S.A.

金属学报(英文版)

By using WDS method of EPMA and EDS tecbnique of STEM.550 and 450℃ isother- mal sections of Fe-Ni-C phase diagram were determined.

关键词: Fe-Ni-C system , null , null

SAM AND XPS STUDIES ON SURFACE SEGREGATION OF SUBSTRATE ELEMENTS IN Au-Ni-KOVAR ALLOY SYSTEM

QI Yunxin TANG Wentai XIA Jianguo Nei Mongol Institute of Metallic Materials , Baotou , ChinaLI Wang ZHAN Zhenzong Institute of Physical and Chemical Engineering Research , Tianjin , China

金属学报(英文版)

The surface segregation of substrate elements through the Au layer in the Au-Ni-Kovar sys- tem specimens heated at 250—350℃ for 0.5—1.5 h has been studied by SAM and XPS. Visual evidence of the mechanism for Ni and Co surface segregation of the complicated sys- tem has been given,i.e.Ni and Co penet...

关键词: Au-Ni-Kovar alloy system , null , null , null , null

MICROSTRUCTURE AND REVERSE SHAPE MEMORY EFFECT IN A Cu-Zn-Al ALLOY

DONG Jianxin CHEN Fumin CHEN Jinming LIU Wenxi Tianjin University , Tianjin , China At pressent he works in Department of materials Science and Technology , University of Science and Technology , Beijing.

金属学报(英文版)

The bainite structure in a Cu-Zn-A1 alloy related to the reverse shape memory effect has been observed by means of TEM.The reverse memory effect may be improved by up to one order of magnitude under applied constraint stress.The widespread propagation of bainite was confirmed to be the diffusion con...

关键词: Cu-Zn-Al memory alloy , null , null

Novel Reduced-friction Materials by Laser Cladding of Copper Alloy on Cast Iron

Xichen YANG Milin ZHONG Tianxi ZHENG Naikun ZHANG Laser Processing Lab. , Tianjin Institute of Textile Science and Technology , Tianjin , 300160 , China

材料科学技术（英文）

Copper alloys suitable for laser cladding on cast iron are selected trom rune types of conventional powders. There are a poor spreading ability and porosity of copper alloy over the surface of castiron. Copper alloy surface is easily oxidized in atmosphere. These shortages have been overcome by ad- ...

关键词: laser cladding , null , null

EFFECT OF TEMPERING IN PULSE MAGNETIC FIELD ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIGH SPEED STEEL

XU Bojun GU Nanju YAN Dianran YIN Fuxing Hebei Institute of Technology , Tianjin , China GU Nanju Division of Heat Treatment , Hebei Institute of Technology , Tianjin 300132 , China

金属学报(英文版)

Using a self-made pulse magnetic field heat treatment equipment with low or medium intensi- ty,the tempering process of high speed steel W6Mo5Cr4V2 was investigated.It was found that the secondary hardening process and the transformation of retained austenite for the steel were accelerated by the pu...

关键词: pulse magnetic field , null , null

MIDRIB AND LEDGE OF BAINITE IN A Cu-Zn-Al-Mn ALLOY

HAN Ming CHEN Fumin CHEN Jinming CHEN Yuru LIU Wenxi Tianjin University , Tianjin , China CHEN Fumin Professor , Dept.of Material Science and Engineering , Tianjin University Tianjin 300072 , China

金属学报(英文版)

The bainitic transformation in a Cu-Zn-Al-Mn alloy has been examined with TEM.The re- sults show that the stacking faults and also the bainitic midrib are found at the beginning of bainite formation in the alloy.The stacking fault planes can pass continuously through the midrib in bainite.The growth...

关键词: Cu-Zn-AI-Mn alloy , null , null

材料期刊网

LASER GLAZING OF Ni-Nb AND Ni-Nb-Cr ALLOYS AND CORROSION RESISTANCE OF AMORPHOUS LAYERS

MODEL FOR INFILTRATION KINETICS OF LIQUID METALS AND ITS APPLICATION

THE MARTENSITIC TRANSFORMATION IN(Y,Mg)-PSZ CERAMICS

GRAPHITE NUCLEI IN CAST IRON UNDER INOCULATION TREATMENT

550 AND 450°C ISOTHERMAL SECTIONS OF Fe-Ni-C PHASE DIAGRAM

SAM AND XPS STUDIES ON SURFACE SEGREGATION OF SUBSTRATE ELEMENTS IN Au-Ni-KOVAR ALLOY SYSTEM

MICROSTRUCTURE AND REVERSE SHAPE MEMORY EFFECT IN A Cu-Zn-Al ALLOY

Novel Reduced-friction Materials by Laser Cladding of Copper Alloy on Cast Iron

EFFECT OF TEMPERING IN PULSE MAGNETIC FIELD ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HIGH SPEED STEEL

MIDRIB AND LEDGE OF BAINITE IN A Cu-Zn-Al-Mn ALLOY

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