Structure and Properties of Ductile Iron Strengthened by Laser Surface Alloying

Jing Xu; Wen Yan Wang; Jing Pei Xie; Ji Wen Li; Ai Qin Wang

doi:10.4028/www.scientific.net/AMR.105-106.413

Paper Titles

Thermal Conductivity of Sm₂Zr₂O₇-Carbon Nanotube Composite
p.398

Preparation and Physical Properties of Sr_xLa_1-xMgAl₁₁O_19-0.5x
p.403

Fabrication of Multiple Oxidation-Resistant Coating on C/SiC Matrix
p.406

Spraying Distance and Oxidation Resistance of Electrothermal Explosion Sprayed MoSi₂-Based Coatings
p.409

Structure and Properties of Ductile Iron Strengthened by Laser Surface Alloying
p.413

Microstructure and Wear Resistance of TiC/Ni₃Al Composites Made by Pressureless Melt Infiltration Processing
p.417

Friction and Wear Characteristics of Laser-Clad Nano-Lubricating Coating
p.421

Plasma Enhanced Microarc Oxidation on the Surface of Al–Cu–Mg Alloy
p.425

Cr-Doped DLC Multilayered Thin Films Deposited Using Cathodic Vacuum Arc- and DC Magnetron-Assisted Ion Beam Sputtering
p.429

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 105-106Structure and Properties of Ductile Iron...

Structure and Properties of Ductile Iron Strengthened by Laser Surface Alloying

Abstract:

The wear resistance, corrosion resistance, high temperature resistance layers were prepared on the surface of ductile iron via laser alloying process, using the mixed ponder of sub-micron carbides power as starting materials. The microstructures of the different laser alloying layers were characterized by XRD, SEM, EDS, TEM. The microhardness and wear resisitance of the laser alloying layers were examined. The results reveal that the flat alloyed coating combines metallurgically with the substrate. the laser area was composed by alloyed zone ,heat-affected zone and matrix zone. The alloyed zone was composed mainly by ledeburite and carbide, while martensite and retained austenite were contained in the heat affected zone, there is no significant change in the Matrix zone. Under conditions that the laser power, spot diameter remain unchanged, with in 400 ~ 1000 mm/min scanning speed, the hardness of alloyed coating increases with increasing scanning speed. The weightlessness of the alloyed samples under the dry sliding friction is one-sixteenth of ductile iron. The wear resisitance of the alloyed coating has improved significantly.