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

摘 要：<正> The microstructure of the laser melted 1.0%C tool steel have been investigated.The region affectedby the laser can be subdivided into 3 zones,which consist of a melted region at the surface,a zonewith solid state transformation and the area adjacent to the unaffected substrate where cementite isslightly dissolved.The melted zone possessed a cellular growth morphology consisting of austeniteand martensite.The carbon content of the austenite was measured to be over 1 wt-%.A great deal ofretained austenite and twinned martensite were found in the first two zones（the melted and solidtransformed）.

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