Effects of heating and hot extrusion process on microstructure and properties of inconel 625 alloy

AbstractCorrosion behaviors of 316 stainless steel (316 ss) and Inconel 625 alloy in molten NaCl–KCl–ZnCl2 at 700°C and 900°C were investigated by immersion tests and electrochemical methods, including potentiodynamic polarization and electrochemical impedance spectroscopy. X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy were used to analyze the phases and microstructures of the corrosion products. Inconel 625 alloy and 316 ss exhibited high corrosion rates in molten chlorides, and the corrosion rates of these two alloys accelerated when the temperature increased from 700°C to 900°C. The results of the electrochemical tests showed that both alloys exhibited active corrosion in chloride molten salt, and the current density of 316 ss in chloride molten salt at 700°C was 2.756 mA/cm−2, which is about three times the value for Inconel 625 alloy; and the values of the charge transfer resistance (Rt) for Inconel 625 were larger than those for 316 ss. The corrosion of these two alloys is owing to the preferred oxidation of Cr in chloride molten salt, and the corrosion layer was mainly ZnCr2O4 which was loose and porous and showed poor adherence to metal.

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Effect of grain refinement and twin structure on the strength and ductility of Inconel 625 alloy

Materials Science and Engineering A ◽

10.1016/j.msea.2021.141739 ◽

2021 ◽

pp. 141739

Author(s):

Xingmao Wang ◽

Yutian Ding ◽

Yubi Gao ◽

Yuanjun Ma ◽

Jianjun Chen ◽

...

Keyword(s):

Grain Refinement ◽

Inconel 625 ◽

Twin Structure ◽

Inconel 625 Alloy ◽

Strength And Ductility

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Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽

10.3390/met11040663 ◽

2021 ◽

Vol 11 (4) ◽

pp. 663

Author(s):

Thomas Borgert ◽

Werner Homberg

Keyword(s):

High Efficiency ◽

Research Work ◽

Hot Extrusion ◽

Extrusion Process ◽

Efficient Production ◽

Secondary Aluminum ◽

Shape Accuracy ◽

Aluminum Chips ◽

Spinning Process ◽

Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

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Mechanical Behavior of Laser Powder Bed Fusion Processed Inconel 625 Alloy

Transactions of the Indian National Academy of Engineering ◽

10.1007/s41403-021-00269-0 ◽

2021 ◽

Author(s):

K. S. N. Satish Idury ◽

V. Chakkravarthy ◽

R. L. Narayan

Keyword(s):

Mechanical Behavior ◽

Inconel 625 ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Inconel 625 Alloy

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CTOD-R curves of the metal-clad interface of API X52 pipes cladded with an Inconel 625 alloy by welding overlay

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/ffe.12462 ◽

2016 ◽

Vol 39 (12) ◽

pp. 1477-1487 ◽

Cited By ~ 6

Author(s):

A. A. de Araújo ◽

F. L. Bastian ◽

E. M. Castrodeza

Keyword(s):

Inconel 625 ◽

Inconel 625 Alloy

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Extrusion Simulation and Texture Study on Mg-Y Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.817.531 ◽

2015 ◽

Vol 817 ◽

pp. 531-537 ◽

Cited By ~ 3

Author(s):

Tao Tang ◽

Yi Chuan Shao ◽

Da Yong Li ◽

Ying Hong Peng

Keyword(s):

Steady State ◽

Texture Evolution ◽

Hot Extrusion ◽

Extrusion Process ◽

Deformation Texture ◽

Arbitrary Lagrangian Eulerian ◽

Fe Method ◽

Tracer Particles ◽

Numerical Simulation Methods ◽

Crystal Plasticity Theory

In order to study the influence of extrusion process on texture development of alloys, numerical simulation methods were used to simulate the round and shape extrusion process and deformation texture. Extrusion of Mg-Y magnesium alloy was carried out at the temperature of 673K with different ram speeds to verify the simulation results. Instead of using the Lagrangian FE method, the Arbitrary Lagrangian-Eulerian (ALE) method was employed in this study so that a more accurate description of the steady-state extrusion process can be achieved. By obtaining strain histories of specified material tracer particles, the coupling of deformation and crystal plasticity theory was applied to simulate the texture evolution in hot extrusion. The results showed that the texture simulation corresponded well with the experimental ones. The study proposes a method to analyze the steady-state extrusion process and texture evolution, and can be used as a useful tool in optimizing the extrusion process.

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