scholarly journals Damping Behavior of Layered Aluminium and Aluminide Coatings on AISI 316 Austenitic Steel

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 888
Author(s):  
Ennio Bonetti ◽  
Enrico Gianfranco Campari ◽  
Angelo Casagrande ◽  
Giuseppe Catania ◽  
Andrea Garzoni
Keyword(s):  
Steel Substrate ◽  
Alloy Layer ◽  
Aluminide Coatings ◽  
Barrier Coating ◽  
Damping Behavior ◽  
Dipping Process ◽  
Soft Alloy ◽  
Microstructural Design ◽  
Aisi 316 ◽  
Interface Sliding

Several coating configurations on AISI 316 steel were obtained by a hot dipping process followed by isothermal interdiffusion. Six different kind of multilayered specimens were produced and characterized. These coatings, typically employed as bond coat in thermal barrier coating (TBC), can also be effective as vibration reduction elements at intermediate and high temperatures. This preliminary work was focused on the microstructural design and processing effects of the coatings. The damping of the produced specimens was measured up to 450 °C and compared with that of the steel substrate. The most performing coatings contain an Al-Si layer and exhibit a steep damping increase above 200 °C, reasonably due to dislocation movements by plastic straining of soft alloy layer and to the interface sliding between layers with different elastic moduli.

scholarly journals Damping Behavior of Layered Aluminium and Aluminide Coatings on AISI 316 Austenitic Steel

2020 ◽  
Author(s):  
Ennio Bonetti ◽  
Enrico Gianfranco Campari ◽  
Angelo Casagrande ◽  
Giuseppe Catania ◽  
Andrea Garzoni
Keyword(s):  
Steel Substrate ◽  
Alloy Layer ◽  
Aluminide Coatings ◽  
Barrier Coating ◽  
Damping Behavior ◽  
Soft Alloy ◽  
Microstructural Design ◽  
Aisi 316 ◽  
Interface Sliding ◽  
And Diffusion

Several coatings configurations of combined aluminizing and diffusion layered aluminide on 316 steel were produced and characterized. These coatings, typically employed as thermal barrier coating (TBC), can also be effective as vibration reduction elements at intermediate and high temperatures. This preliminary work has been focused on the microstructural design and processing effects of the coatings. The damping of the produced specimens was measured up to 450°C and compared with that of the steel substrate. The most performing coatings contain an Al-Si layer and exhibit a steep damping increase above 200 °C, reasonably due to dislocation movements by plastic straining of soft alloy layer and to the interface sliding between layers with different elastic moduli.

Study on formation and characterization of iron aluminide coatings on 9Cr–1Mo steel substrate

2014 ◽  
Vol 240 ◽  
pp. 365-372 ◽  
Author(s):  
R. Arabi Jeshvaghani ◽  
M. Emami ◽  
O. Shafiee ◽  
H.R. Shahverdi
Keyword(s):  
Steel Substrate ◽  
Iron Aluminide ◽  
Aluminide Coatings

scholarly journals Description Of Alloy Layer Formation On A Cast Steel Substrate

2015 ◽  
Vol 60 (3) ◽  
pp. 2367-2372 ◽  
Author(s):  
J. Szajnar ◽  
A. Dulska ◽  
T. Wróbel ◽  
C. Baron
Keyword(s):  
Steel Substrate ◽  
Cast Steel ◽  
Solidus Temperature ◽  
Alloy Layer ◽  
Layer Formation ◽  
High Carbon ◽  
Preceding Step ◽  
Chromium Cast Iron ◽  
And Diffusion ◽  
Liquidus Temperatures

Abstract A description of alloy layer formation on a steel substrate is presented. Two types of formation are considered: diffusion of carbon and chromium into the solid from the pad in the direction of the cast steel within the FeCrC (grains) and diffusion in a layer of liquid chromium cast iron formed in a preceding step. The influence of silicon in the pad on the pad’s transformation into the liquid is also examined. Solidus and liquidus temperatures of high carbon ferrochromium are determined. The larger the content of Si is used in the experiment, the lower the solidus temperature of the FeCrC alloy is observed. This results from the higher intensity of the elements’ diffusion and faster formation of the liquid.

Structure and Performance of Fe-Al Alloy Layer for Twin Wire Surfacing on the Steel Substrate

2013 ◽  
Vol 658 ◽  
pp. 158-164
Author(s):  
Jin Yu ◽  
Yin Zhuo Huang ◽  
Bo Wen Wu ◽  
Hou Xian Zhou
Keyword(s):  
Abrasion Resistance ◽  
Steel Substrate ◽  
Base Material ◽  
Performance Testing ◽  
Alloy Layer ◽  
Resistance Testing ◽  
Al Alloy ◽  
Welding Wire ◽  
Precipitated Phase ◽  
Welding Line

Surfacing of Fe-Al alloy layer is achieved on the surface of Q235 steel plate by using the twin wire consisting of one aluminum welding wire and one steel welding wire in the shielding of pure argon. When the ER1100 aluminum welding wire of Φ1.6mm and ER50-6 steel welding wire of Φ1.2mm are selected as the master wire and slave wire respectively, with preheating and interlayer temperature reaching 350°C by controlling filling volume of aluminum and steel , the Fe-Al alloy layer featured by well-formed welding line is thus gained with no macroscopic defect. As the mechanical performance testing shows, the shear strength of surface combining surfacing layer and steel substrate is higher than 270MPa. The rupture position is located in surfacing layer and it turns out to be brittle fracture; the micro-hardness of surfacing layer ranges from 320HV to 420HV. Abrasion resistance testing indicates that abrasion resistance of surfacing layer is better than that of base material. According to micro-structure observation, the welding line is a coarsening columnar structure with a great deal of precipitated phase. According to EDAX, the aluminum content of precipitated phase in surfacing layer ranges from 24% to 32% (at), and the steel content ranging from 76% to 68% (at) - it is thus considered a Fe3Al structure through XRD.

Solid State Diffusion Welding by Superplastic Coordinate Deformation between Vacuum Spray Fusing Alloy G111WC and Steel Substrate

2007 ◽  
Vol 551-552 ◽  
pp. 399-403 ◽  
Author(s):  
Yao Zong Zhang ◽  
Jian Bo Huang ◽  
H.P. Wang ◽  
X. Lin
Keyword(s):  
Solid State ◽  
Solid Phase ◽  
Steel Substrate ◽  
Strain Ratio ◽  
Alloy Layer ◽  
Diffusion Welding ◽  
Solid State Diffusion ◽  
State Diffusion ◽  
Superplastic State ◽  
Is Strain

This paper discusses the issues about the incorruptibility of industrial dies, mainly researches the G111WC and G112WC mixed alloy layer sprays fusing on the surface of industrial dies under the vacuum condition and the solid phase welding-on mechanism of the mixed alloy layer under superplastic state. It points out that when W≈1 ( W is strain ratio of coating and substrate ) and within the range of the generatrix’s superplasticity, the layer and the generatrix will realize the solid state diffusion joining by superplastic coordinate deformation, which leads to an effective welding.

Effect of Atmosphere Composition on Lifetime and Oxidation Behavior of EB-PVD TBC with NiPtAl Bondcoats

2013 ◽  
Vol 652-654 ◽  
pp. 1822-1825
Author(s):  
Peng Song ◽  
Jian Sheng Lu
Keyword(s):  
Oxide Layer ◽  
Base Alloy ◽  
Layer Growth ◽  
Low Oxygen ◽  
Aluminide Coatings ◽  
Barrier Coating ◽  
Temperature Exposure ◽  
Short Time ◽  
Surface Morphologies ◽  
Tbc Systems

NiPtAl coatings are widely used as bondcoats for thermal barrier coating (TBC) systems during high temperature exposure. Pt modified aluminide coatings on the CMSX-4 Ni-base alloy were oxidized at 1150°C in different atmospheres. Cross-section oxide layer morphologies on the NiPtAl coatings after TBC failure were similar in air with that in air+15%H2O. The surface morphologies of as-received low and high-Pt bondcoats showed great effect on the oxide layer growth and morphologies due to the different compositions within the two bondcoats. The irregular alumina surface on the low-Pt bondcoat was showed due to the slipping of the NiPtAl grains. Raman spectroscopy illustrated that the alumina mainly consisted θ and α-Al2O3during the Ar+20%O2exposure, however, only α-Al2O3could be found in Ar+4%H2+2%H2O during short time exposure. Low oxygen partial pressure of Ar+4%H2+2%H2O perhaps is the reason that spinel and θ-Al2O3can not formed, and directly promotes the α-Al2O3formation.

Advanced Coatings on High Temperature Applications

2006 ◽  
Vol 522-523 ◽  
pp. 1-14 ◽  
Author(s):  
Toshio Narita ◽  
Takeshi Izumi ◽  
Takumi Nishimoto ◽  
Yoshimitsu Shibata ◽  
Kemas Zaini Thosin ◽  
...  
Keyword(s):  
High Temperature ◽  
Diffusion Barrier ◽  
Layer Structure ◽  
Diffusion Coating ◽  
Alloy Layer ◽  
Outward Diffusion ◽  
Hastelloy X ◽  
Alloy Substrate ◽  
Barrier Coating ◽  
Ni Alloy

To suppress interdiffusion between the coating and alloy substrate in addition to ensuring slow oxide growth at very high temperatures advanced coatings were developed, and they were classified into four groups, (1) the diffusion barrier coating with a duplex layer structure, an inner σ−(Re-Cr-Ni) phase as a diffusion barrier and outer Ni aluminides as an aluminum reservoir formed on a Ni based superalloy, Hastelloy X, and Nb-based alloy. (2) the up-hill diffusion coating with a duplex layer structure, an inner TiAl2 + L12 and an outer β-NiAl formed on TiAl intermetallic and Ti-based heat resistant alloys by the Ni-plating followed by high Al-activity pack cementation. (3) the chemical barrier coating with a duplex layer structure, an inner* γ + β + Laves three phases mixture as a chemical diffusion barrier and an outer Al-rich γ-TiAl as an Al reservoir formed by the two step Cr / Al pack process. (4) the self-formed coating with the duplex structure, an inner α-Cr layer as a diffusion barrier and an outer β-NiAl as an Al-reservoir on Ni-(2050)at% Cr alloy changed from the δ-Ni2Al3 coating during oxidation at high temperature. The oxidation properties of the coated alloys were investigated at temperatures between 1173 and 1573K in air for up to 1,000 hrs (10,000 hrs for the up-hill diffusion coating). In the diffusion barrier coating the Re-Cr-Ni alloy layer was stable, existing between the Ni-based superalloy (or Hastelloy X) and Ni aluminides containing 1250at%Al when oxidized at 1423K for up to 1800ks. It was found that the Re-Cr-Ni alloy layer acts as a diffusion barrier for both the inward diffusion of Al and outward diffusion of alloying elements in the alloy substrate. In the chemical barrier coating both the TiAl2 outermost and Al-rich γ-TiAl outer layers maintained high Al contents, forming a protective Al2O3 scale, and it seems that the inner, γ, β, Laves three phase mixture layer suppresses mutual diffusion between the alloy substrate and the outer/outermost layers.

Microstructure and Properties of Laser Cladding Co-Based Alloy Layer

2013 ◽  
Vol 764 ◽  
pp. 47-53 ◽  
Author(s):  
X.R. Zhao ◽  
Dun Wen Zuo ◽  
H. Cheng ◽  
Q.T. Li ◽  
S. Dai ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Base Alloy ◽  
Steel Substrate ◽  
Alloy Layer ◽  
Crystal Layer ◽  
X Ray Diffraction ◽  
Continuous Laser ◽  
Columnar Crystal ◽  
Cladding Layer ◽  
Cladding Layers

The Co-base alloy laser cladding layer was coated on the 2738 mold steel surface by using the TJ-HL-5000 transverse-flow CO2 continuous laser. The morphology and hardness were investigated by metallography microscope, scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness tester. The metallography microscope and SEM investigations show that from interface to surface along the cross section direction, the cladding layers consist of plane crystal layer, columnar crystal layer, dendrites layer and surface cellular crystal layer, respectively. XRD results indicate that the cladding layer is made of γ-Co, Cr23C6, MoC, FeCr and Co3Mo2Si phases. The micro-hardness of the laser cladding coating was about 900-1100HV1, 3 times or more of the steel substrate. And the mechanisms of microstructure formation and strengthening are investigated.

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