scholarly journals Bimetallic structure formation by method of coaxial laser fusion

2019 ◽  
Vol 2019 (3) ◽  
pp. 32-38 ◽  
Author(s):  
Александр Григорьянц ◽  
Aleksandr Grigoryants ◽  
Владислав Фунтиков ◽  
Vladislav Funtikov ◽  
Александр Мисюров ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Structure Formation ◽  
Copper Alloy ◽  
Metallographic Analysis ◽  
Small Scale ◽  
Laser Fusion ◽  
Laser Technologies ◽  
Domestic Plant ◽  
Bimetallic Structures

Manufacturing stainless steel and copper alloy bimetallic structures with the aid of domestic plant KLP-400 made at the small-scale enterprise PC “Moscow Center of laser technologies” of Bauman STU of Moscow for coaxial laser fusion is considered. A metallographic analysis of the structure of samples grown and which has shown high structural-sensitive properties is carried out.

scholarly journals Oxidation Behavior of an Austenitic Steel (Fe, Cr and Ni), the 310 H, in a Deaerated Supercritical Water Static System

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 571
Author(s):  
Aurelia Elena Tudose ◽  
Ioana Demetrescu ◽  
Florentina Golgovici ◽  
Manuela Fulger
Keyword(s):  
Stainless Steel ◽  
Supercritical Water ◽  
Nuclear Reactor ◽  
Electrochemical Impedance ◽  
Electrochemical Methods ◽  
Metallographic Analysis ◽  
Gravimetric Analysis ◽  
Static System ◽  
Eis Measurements ◽  
Supercritical Temperature

The aim of this work was to study the corrosion behavior of a Fe-Cr-Ni alloy (310 H stainless steel) in water at a supercritical temperature of 550 °C and a pressure of 250 atm for up to 2160 h. At supercritical temperature, water is a highly aggressive environment, and the corrosion of structural materials used in a supercritical water-cooled nuclear reactor (SCWR) is a critical problem. Selecting proper candidate materials is one key issue for the development of SCWRs. After exposure to deaerated supercritical water, the oxides formed on the 310 H SS surface were characterized using a gravimetric analysis, a metallographic analysis, and electrochemical methods. Gravimetric analysis showed that, due to oxidation, all the tested samples gained weight, and oxidation of 310H stainless steel at 550 °C follows parabolic rate, indicating that it is driven by a diffusion process. The data obtained by microscopic metallography concord with those obtained by gravimetric analysis and show that the oxides layer has a growing tendency in time. At the same time, the results obtained by electrochemical impedance spectroscopy (EIS) measurements indicate the best corrosion resistance of Cr, and (Fe, Mn) Cr2O4 oxides developed on the samples surface after 2160 h of oxidation. Based on the results obtained, a strong correlation between gravimetric analysis, metallographic analysis, and electrochemical methods was found.

Fatigue Crack Growth Properties of a Cryogenic Structural Steel at Liquid Helium Temperature

1996 ◽  
Vol 118 (1) ◽  
pp. 109-113 ◽  
Author(s):  
Shinji Konosu ◽  
Tomohiro Kishiro ◽  
Ogi Ivano ◽  
Yoshihiko Nunoya ◽  
Hideo Nakajima ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
Austenitic Stainless Steel ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Liquid Helium ◽  
Liquid Helium Temperature ◽  
Small Scale ◽  
Helium Temperature ◽  
Growth Properties

The structural materials of the coils of superconducting magnets utilized in thermonuclear fusion reactors are used at liquid helium (4.2 K) temperatures and are subjected to repeated thermal stresses and electromagnetic forces. A high strength, high toughness austenitic stainless steel (12Cr-12Ni-10Mn-5Mo-0.2N) has recently been developed for large, thick-walled components used in such environments. This material is non-magnetic even when subjected to processing and, because it is a forging material, it is advantageous as a structural material for large components. In the current research, a large forging of 12Cr-12Ni-10Mn-5Mo-0.2N austenitic stainless steel, was fabricated to a thickness of 250 mm, which is typical of section thicknesses encountered in actual equipment. The tensile fatigue crack growth properties of the forging were examined at liquid helium temperature as function of specimen location across the thickness of the forging. There was virtually no evidence of variation in tensile strength or fatigue crack growth properties attributable to different sampling locations in the thickness direction and no effect of thickness due to the forging or solution treatment associated with large forgings was observed. It has been clarified that there are cases in which small scale yielding (SSY) conditions are not fulfilled when stress ratios are large. ΔJ was introduced in order to achieve unified expression inclusive of these regions and, by expressing crack growth rate accordingly, the following formula was obtained at the second stage (middle range). da/dN = CJ ΔJmJ, CJ = AJ/(ΔJ0)mJ, where, AJ = 1.47 × 10−5 mm/cycle, ΔJ0 = 2.42 × 103N/m.

scholarly journals Titanium and Stainless Steel MIG LSC Welding

2019 ◽  
Vol 22 (2) ◽  
pp. 56-59
Author(s):  
Nela Poláková ◽  
Petr Dostál
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Arc Welding ◽  
Galvanic Corrosion ◽  
Welding Process ◽  
Protective Atmosphere ◽  
Metallographic Analysis ◽  
Chemical Compositions ◽  
Additional Material ◽  
Welding Method

Abstract This paper deals with the issue of welding two different materials – titanium and stainless steel (UNS N50400 + X5CrNi 18-10). These two materials have completely different chemical compositions and mechanical properties; therefore, process of their mutual welding is complicated. Melting temperature of both materials is also different. An innovative MIG LSC arc welding method with an additional material has been selected for this purpose. A protective atmosphere was used in order to avoid galvanic corrosion of materials that would preclude the welding process. Aforementioned atmosphere contained 100% Ar. The MIG LSC welding method was designed by Fronius. Presented experiment compares utilization of following 4 different electrodes (additional material) for the welding of titanium and stainless steel: Ti, Fe, corrosion-resistant Fe and CuSi3 electrode. Tensile test was utilized for evaluation of weldment mechanical properties. Measured results were supplemented with a metallographic analysis snapshot and tensile diagram.

Impulse pressuring diffusion bonding of a copper alloy to a stainless steel with/without a pure nickel interlayer

2013 ◽  
Vol 52 ◽  
pp. 359-366 ◽  
Author(s):  
Xinjian Yuan ◽  
Kunlun Tang ◽  
Yongqiang Deng ◽  
Jun Luo ◽  
Guangmin Sheng
Keyword(s):  
Stainless Steel ◽  
Diffusion Bonding ◽  
Copper Alloy ◽  
Pure Nickel

Investigation on the melt ejection and burr formation during laser fusion cutting of stainless steel

2020 ◽  
Vol 32 (2) ◽  
pp. 022068 ◽  
Author(s):  
S. Stoyanov ◽  
D. Petring ◽  
D. Arntz-Schroeder ◽  
M. Günder ◽  
A. Gillner ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Burr Formation ◽  
Laser Fusion ◽  
Laser Fusion Cutting ◽  
Melt Ejection
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