LIU Changqing WU Weitao JIN Zhujing DAI Shaoxia WANG Wenhao Corrosion Science Laboratory
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Institute of Corrosion and Protection of Metals
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Academia Sinica
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Shenyang
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110015
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ChinaInstitute of Metal Research
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Academia Sinica
,
Shenyang
,
110015
,
ChinaTo whom correspo
材料科学技术（英）
By means of EPMA,SIMS and XTEM tech- niques,the element distribution at the transition zone of Y-modified ion plated titanium and titanium nitride film on A3 steel substrate and the variation of the element content on the surface of the evaporation source before and after service were studied in detail.A mode was proposed in terms of preferential evaporation and micro-tunnel trans- portation of Y at the interface of film/substrate.
关键词:
Y-enrichment
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CHE Chengwei ZHANG Zhiming DONG Xianglin LIU Chengliang Harbin Institute of Technology
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Harbin
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150006
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ChinaInstitute of Metal Research
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Academia Sinica Shenyang
,
110015
,
China
材料科学技术（英）
The behaviour of oxidation at elevated tem- peratures and fretting in the laser-alloyed layer of Ti-6Al-4V with the addition of Pr was studied. The results show that the addition of Pr changes the structure of oxide scale of Ti-6Al-4V,controls the short-range diffusion of oxygen to the scale/substrate interface and increases the adhe- sion and ductility of the scale,thus changing the oxidation kinetics and considerably reducing oxidation rate.The analysis of fretting test shows that the existence of high hardness layer in the al- loyed zone,fine dendrites perpendicular to the sur- face of the high hardness layer and the oxide scale produced during fretting at elevated temperatures are all beneficial to the improvement of wear resist- ance.
关键词:
laser modification
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LI Ruiguo FENG Jun FENG Zhongchao Corrosion Science Laboratory.Institute of Corrosion and Protection of Metals. Academia Sinica
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Shenyang
,
110015
,
ChinaInstitute of Metal Research
,
Academia Sinica.Shenyang 110015
,
China
材料科学技术（英）
Silicon was added to the surface of 304 stain- less steel by laser melting the sprayed preplaced Si powders.The optical microscopy,X-ray diffraction and EPMA were employed to investigate the microstructure and chemical composition of the laser surface alloyed layer.The hardness of the al- loyed layer was measured by microhardness test and wear resistance was evaluated by scratch test. Corrosion resistance of laser alloyed sample was studied in 1N H_2SO_4+0.1N NaCl and 0.5N HCl+0.5N NaCl aqueous solutions.A microcrystalline intermetallic compound coating with smooth surface and good chemical homogeneity without porosity and crack is ob- tained.The hardness is about 720 HV.The wear re- sistance is 2 times better than that of the substrate. The corrosion resistance of the laser alloyed sample is much better than that of 304 stainless steel sample.
关键词:
laser
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