MICROSTRUCTURE AND PROPERTIES OF IN SITU SYNTHESIZED ZrC-ZrB_2/Fe COMPOSITE COATING PRODUCED BY GTAW
A metal matrix composite coating reinforced by ZrC-ZrB2 participates has been successfully fabricated utilizing the in situ reaction of Zr, B4C and Fe pre-placed mixed powders by gas tungsten arc welding (GTAW) cladding process. Various volume fraction of ZrC-ZrB2 particulates composite coatings were produced through cladding different weight ratios of Zr+B4C (30％, 50％, 70％) to improve the wear resistance of AISI1020 steel substrate. The Microstructure of the coating was analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive spectrum (EDS), meantime microhardness and wear resistance at room temperature of the composite coating were examined by means of Microhardness Tester and Wear Tester, respectively. The results show that the main phases of the composite coating obtained by GTAW are ZrC, ZrB2 and α-Fe, ZrC exhibits hexahedron and petal shapes, ZrC-ZrB2 compound presents acicular and clubbed forms. With the increase of content of Zr+B4C the maximum volume fraction of ZrC-ZrB2 particulates can reach 16. 5％, microhardness is up to 1300HV, and wear resistance is about twenty times higher than that of AISI1020 steel substrate.
Composite coating GTAW microstructure microhardness wear resistance
ZHENTING WANG LILI CHEN XIANYOU ZHANG
Mobile Postdoctoral Center of Materials Science and Engineering, Harbin University of Science and Te College of Materials Science and Engineering, Heilongjiang Institute of Science and Technology, 1, T Mobile Postdoctoral Center of Materials Science and Engineering, Harbin University of Science and Te
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1438-1443
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）