A comparison of outgassing rate of 304 stainless steel and A6063‐EX aluminum alloy vacuum chamber after filling with water

In recent years, advances in coating deposition technologies have led to the development of nano-structured coating materials with unique properties. Among the many systems, Cr-Al-Si-N coatings have a variety of interesting properties such as the superhardness (~40 GPa), thermal stability with high-temperature oxidation resistance. These coatings were characterized as nanocomposites consisting of nanocrystalline CrN or CrAlN embedded in amorphous Si3N4 matrix. Nevertheless extensive discussion has been focused on the mechanical and thermal properties of Cr-Al-Si-N coating, the corrosion resistance at higher temperature is not reported yet. Therefore, the main target of this study is to evaluate the corrosion resistance of the CrN/AlSiN multilayer coating which was synthesized by cathodic arc deposition with Cr and Al88Si12 dual cathodes. The as-deposited coating was following conducted with heat treatment in nitrogen atmosphere at the temperature of 400 oC, 600 oC and 800 oC for 1 hour, respectively. Microstructure of the heated films is analyzed by X-ray photoelectron spectroscope, X-ray diffractometer and scanning electron microscopy. The corrosion resistance of the heated CrN/AlSiN coatings was studied by dipping in the aluminum alloy melt for 3 hours. The results turned out that the better corrosion resistance of CrN/AlSiN multilayer coated stainless steel was obtained by post deposition annealing treatment in nitrogen at 400 oC and 600 oC if compared to that of the other samples.

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Development of Rapidly-Quenched Al-Ge-Si Filler Alloys for the Joining of Stainless Steel AISI 304 and Aluminum Alloy AA6082

Metals ◽

10.3390/met11121926 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1926

Author(s):

Alexander Ivannikov ◽

Vasilii Fedorov ◽

Anton Abramov ◽

Milena Penyaz ◽

Diana Bachurina ◽

...

Keyword(s):

Solid Solution ◽

Stainless Steel ◽

Aluminum Alloy ◽

Diffusion Processes ◽

304 Stainless Steel ◽

Scanning Calorimetry ◽

Germanium Content ◽

Aisi 304 ◽

Steel Aisi ◽

Stainless Steel Aisi

Aluminum alloys based on the Al-Ge-Si system with a germanium content of up to 40 wt.%, promising for the brazing of aluminum alloy AA6082 with the stainless steel AISI 304, were studied. The temperature characteristics and microstructural and mechanical properties of the filler alloys were systematically investigated. Differential scanning calorimetry showed that with an increase in the germanium content from 28.0 to 40.0 wt.%, the liquidus temperature of the filler alloys decreased from 514.8 to 474.3 °C. X-ray diffraction analysis and electron microscopy data showed that the foil of the filler alloys reveals a homogeneous structure. The ingots of the alloys contain two eutectics, the first of which consists of a solid solution of (Al, Ge) with a solid solution of (Ge, Si), and the second consists of a solid solution of (Al, Ge) with a solid solution based on (Ge). When the content of germanium increases from 28.0 to 40.0 wt.%, a separation of the faceted solid solution particles (Ge, Si) and an increase in their number could be observed. Nanohardness measurements showed that the (Ge, Si) and (Ge) solid solutions had similar nanohardness, with values of 11.6 and 10.2 GPa, respectively. Simultaneously, the Al solid solution and the intermetallic Al7Ge2Fe phase exhibited significantly lower nanohardness values of 0.7 and 6.7 GPa, respectively. Brinell hardness measurements showed that the ingots of the filler alloys were sufficiently ductile and had a hardness comparable to that of AA6082, which is used for brazing with AISI 304 stainless steel. The obtained results for the studied ingots and the rapidly quenched foils can be used to predict the forming structure of the seam after brazing and adjusted for diffusion processes occurring between the brazed materials and the studied filler alloys.

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Wettability, microstructure and properties of 6061 aluminum alloy/304 stainless steel butt joint achieved by laser-metal inert-gas hybrid welding-brazing

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(18)64839-3 ◽

2018 ◽

Vol 28 (10) ◽

pp. 1938-1946 ◽

Cited By ~ 6

Author(s):

Jun-yu XUE ◽

Yuan-xing LI ◽

Hui CHEN ◽

Zong-tao ZHU

Keyword(s):

Stainless Steel ◽

Aluminum Alloy ◽

Butt Joint ◽

Inert Gas ◽

304 Stainless Steel ◽

Hybrid Welding ◽

6061 Aluminum Alloy ◽

Microstructure And Properties

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Aluminum Foam Sandwich with Different Face-Sheet Materials under Three-Point Bending

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.872.25 ◽

2017 ◽

Vol 872 ◽

pp. 25-29 ◽

Cited By ~ 1

Author(s):

Chang Yan ◽

Xu Ding Song ◽

Shuo Feng

Keyword(s):

Stainless Steel ◽

Aluminum Alloy ◽

Aluminum Foam ◽

Sheet Material ◽

Face Sheet ◽

304 Stainless Steel ◽

Foam Core ◽

6061 Aluminum Alloy ◽

Three Point Bending ◽

Sheet Materials

Aluminum foam sandwich structure is a new type of composite material with excellent mechanical and functional properties. As it is known that properties of aluminum foam sandwiches (AFS) vary if the foam core is sandwiched between different face sheets. To study the effects of face-sheet materials on the mechanical properties of AFS and enable a better understanding of the usage of such AFS structures under flexural load, AFS sandwiched by 6061-aluminum alloy face-sheets and 304 stainless steel face-sheets were fabricated and investigated under three-point bending by using WDW-T100 electronic universal tensile testing machine. Results showed that 6061-aluminum alloy reinforced AFS had the same peak load value with 304-stainless steel reinforced one almost so long as the thicknesses of the face-sheet material were the same and the foam core densities were the same too, but the energy absorption ability of 304-stainless steel reinforced AFS was much higher than that of 6061-aluminum alloy reinforced. However, the integrality of the 6061-sandwiched AFS was better than 304-sandwiched AFS. Deformation modes of the two types of AFS were also discussed in the present study.

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