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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

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

New Laser-cladding Technique for Welding of Bridge Wires in Detonators

LI Yongzheng ZHANG Qiu'e Changchun Institute of Optics and Fine Mechanics , Changchun , 130022 , China

材料科学技术（英文）

The laser-cladding technique for welding of bridge wires is reported for the first time.The essen- tial feature of this technique different from the cur- rent methods is the realization of mutual melting of workpieces.Thus the stability of products is im- proved in an order of magnitude.The main points of the technique and the microanalyses of the weld- ing spot and other features are given.The technique presented is a novel method of welding between tiny piece and workpiece of different sizes and proper- ties.

关键词: laser-cladding technique , null , null , null

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