XU Yourong ZHANG Henghua CHEN Darning XIE Fuchun XU Mingyu Shanghai University of Science and Technology
,
Shanghai
,
ChinaCHEN Lanying SU Baorong QIAN Hongbin Shanghai Optics and Fine Mechinery Research Institute
,
Academia Sinica
,
Shanghai
,
China XU Yourong
,
professor
,
Department of Materials Science and Engineering
,
Shanghai University of Science and Technology
,
Shanghai 201800
,
China
金属学报(英文版)
Effect of laser scanning speed on phase constitution,microstructure,microhardness and wear resistance of laser-cladding hard facing alloy Stellite 12 has been investigated by means of a cross-flow-type CO_2 laser of 1.5 kW.The laser-cladding layer on the alloy consists of ma- trix phase of suppersaturated solid solution γ(Co,Cr)and complex hexagonal carbide M_7C_3.Under certain condition,at higher laser scanning speed,the suppersaturated solubility of elements increases in γ(Co,Cr),and the precipitation of the complex carbtde M_7C_3 de- creases,so the microhardness increases and the wear resistance decreases.But at slower laser scanning speed,more complex carbide M_7C_3 may precipitate,and the wear resistance may be improved.Therefore,it is believed that the principal factor in improving wear resistance is the precipitation of carbide M_7C_3,while increment of microhardness is the suppersaturated solu- bility of elements in matrix phase γ(Co,Cr).
关键词:
laser-cladding
,
null
,
null
,
null
LI Laifeng XING Zhongshu Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China XING Zhongshu
,
professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The solubilities of Ce,Nd and Y in α-Fe at 873 to 1153 K have been deter mined by means of electron microprobe quantitative analyses.The temperature dependences of the solubilities were obtained from the experimental data.The results have been compared with those deter- mined by three other technigues,very good agreement was obtained between the results of all these techniques.
关键词:
α-Fe
,
null
,
null
,
null
,
null
SUN Jian LIN Dongliang Shanghai Jiaotong University
,
Shanghai
,
China LIN Dongliang
,
professor
,
Department of Materials Science
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China
金属学报(英文版)
Equilibrium equation of point defects in Ll_2 type intermetallic compounds was established to calculate the relations of the concentration of antisite defects and vacancies and bulk composi- tion in Ni_3Al.The examination of temperature effects on the point defects cleared up the mis. understanding of the properties of the“constitutional point defects”in Ni_3Al.
关键词:
intermetallic compound
,
null
,
null
,
null
