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SiO_2 AS HETEROGENEOUS NUCLEI OF INTERGROWTH EUTECTIC IN MODIFIED AS-CAST MEDIUM MANGANESE STEEL

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

Microstructure of Laser Processed T10 Carbon Tool Steel

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（英文）

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

Laser/Electron Beam Processing of As-cast Nd_2Fe_(14)B Alloy

HU Jiandong , ZHANG Xujun , SHI Zhusheng Microanalysis Center , Jilin University of Technology , Changchun , 130025 , China.Department of Metallurgy and Materials , University of Birmingham U.K.

材料科学技术（英文）

It was found that the free Fe in the melted zone of the as—cast Nd_2Fe_(14)B alloy could be dissolved by Iaser/electron beam.The growth direction of Nd_2Fe_(14)B grains is nearly perpendicular to the sur- face of the samples.EDX examination showed that Fe element was homogeneously distributed in the melted zone.Results presented in this paper have giv- en hint to remove free Fe in as—cast Nd_2Fe_(14)B alloy.

关键词: Nd-Fe-B alloy , null

NODULARIZATION OF CARBIDE IN AS-CAST WEAR-RESISTANT MANGANESE STEEL

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

Institute of Materials Science at Jilin University——A Brief Overview

WANG Yuming Institute of Materials Science , Jilin University , Changchun , 130023 , China

材料科学技术（英文）

关键词:

Mechanism of the Interfacial Reaction of AI_2O_3/Medium Mn Steel Containing Nb

Sirong YU Yaohui LIU Zhenming HE Dept.of Metallic Materials Engineering , Jilin University of Technology , Changchun , 130022 , China

材料科学技术（英文）

The mechanism of the interfacial reaction of Al_2O_3/medium Mn steel containing Nb was studied by means of the observation on the interfacial reaction phenomenon of Al_2O_3/medium Mn steel,and the analyses on the interracial phases.The results show that when T≥1550℃,the interfacial reac- tion of Al_2O_3/medium Mn steel containing Nb happened.In the medium Mn steel matrix,Nb exists in the form of NbC.NbC are the nucleating base of CO gas bubbles.

关键词: Nb , null , null , null