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Dongheng Xu,Han Wang,Xuewei Tao,Zhengjun Yao,Shasha Zhang,Moliar Oleksander 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The Inconel 718 (IN718) alloy coatings were successfully fabricated using electron beam wire-feeding deposition technology.The macrostructure, microstructure and elemental analysis of the deposited coatings were characterized by OM, SEMand EDS. Moreover, the hardness and wear resistance were also investigated experimentally. The results showed that thecross section of the deposited coatings can be divided into three different regions: clad zone (CZ), fusion zone (FZ) and heataffected zone. Equiaxed dendrites appeared in the CZ while columnar dendrites occurred in the FZ, and discrete fine Lavesphase particles were formed under low beam current while continuous coarse Laves phase particles were found under highbeam current. The EDS results showed that the degree of Nb segregation in FZ is higher than that in CZ. More importantly,the microstructure coarsened and the degree of Nb segregation increased with the increase of beam current. The depositedcoating under the lowest beam current (10 mA) has the highest hardness (263 HV0.2) and the minimum specific wear rate(3.95391 × 10−15 m3/Nm), which is corresponding to the fine microstructure, discrete Laves phase particles and low degreeof Nb segregation under low beam current.
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Burn-resistant Coatings Lubricated on the Surface of Titanium Alloys
Pingze Zhang,Jun Huang,Hongyan Wu,Qiang Miao,Zhengjun Yao,Zhong Xu,Zhiyong He 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
Conventional titanium alloy may be ignited and burnt in conditions of high temperature, high air pressure, and high gas flow velocity. In the present study, burn-resistant coatings have been lubricated by using double glow plasma surface alloying technology. Alloying elements Cr, Mo, and Cu were induced into Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si substrates through double glow discharged plasma processing, and Ti-Cr, Ti-Mo, and Ti-Cu burn-resistant alloy layers were formed on the surface of the Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si alloys. The depth of the surface burn-resistant alloy layers could exceed 200 μm and the alloying-element component could reach 90%. Burn-resistant performance experimental results show that if the Cr component(wt%) is over 14%, the Cu component is over 12%, and the Mo component is over 10% in the alloying layers, ignition and burn of titanium alloy are effectively avoided. Conventional titanium alloy may be ignited and burnt in conditions of high temperature, high air pressure, and high gas flow velocity. In the present study, burn-resistant coatings have been lubricated by using double glow plasma surface alloying technology. Alloying elements Cr, Mo, and Cu were induced into Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si substrates through double glow discharged plasma processing, and Ti-Cr, Ti-Mo, and Ti-Cu burn-resistant alloy layers were formed on the surface of the Ti6Al4V and Ti6.5Al0.3Mo1.5Zr0.25Si alloys. The depth of the surface burn-resistant alloy layers could exceed 200 μm and the alloying-element component could reach 90%. Burn-resistant performance experimental results show that if the Cr component(wt%) is over 14%, the Cu component is over 12%, and the Mo component is over 10% in the alloying layers, ignition and burn of titanium alloy are effectively avoided.
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