Effect of nano Nb and V carbides on the hydrogen interaction in tempered martensitic steels

2021 ◽  
Author(s):  
T.A.A. dos Santos ◽  
M.M. de Lima ◽  
D.S. dos Santos ◽  
V.T.L. Buono
Keyword(s):  
Martensitic Steels ◽  
Hydrogen Interaction

scholarly journals Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels

2021 ◽  
Vol 807 ◽  
pp. 140900 ◽  
Author(s):  
L. Tan ◽  
J.D. Poplawsky ◽  
Y. Yang
Keyword(s):  
Martensitic Steels

Study of the Role of Small Additions of Zr in the CVD- FBR Aluminization Process

2009 ◽  
Vol 289-292 ◽  
pp. 293-300
Author(s):  
L. Sánchez ◽  
F.J. Bolívar ◽  
M.P. Hierro ◽  
F.J. Pérez
Keyword(s):  
Fluidized Bed ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Fluidized Bed Reactor ◽  
Iron Aluminide ◽  
Martensitic Steels ◽  
Aluminide Coatings ◽  
Deposition Parameters ◽  
Zirconium Powder

In this work, iron aluminide coatings were developed by Chemical Vapor Deposition in Fluidized Bed Reactor (CVD-FBR) on ferritic-martensitic steels. Small additions of zirconium powder were introduced in the fluidized bed; as a consequence, the obtained coatings are thicker than that without zirconium additions. When Zr powders are added in the fluidized bed, the deposition atmosphere drastically changes, leading to increase the deposition rate. Thermodynamic calculations were carried out to simulate the modifications in the CVD atmosphere in the Al/Zr deposition system in comparison to the single aluminization. In order to optimize the conditions of the deposition, parameters such as temperature and concentration of zirconium introduced into the bed were evaluated and compared with the results obtained for the single aluminum deposition.

A Thermodynamics Study of Hydrogen Interaction with (110) Transition Metal Surfaces

2021 ◽  
pp. 148961
Author(s):  
Feina Zhai ◽  
Yun Tian ◽  
Dandan Song ◽  
Yuanjie Li ◽  
Xiaojing Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Surfaces ◽  
Hydrogen Interaction ◽  
Transition Metal Surfaces

Experimental Development at a Pilot Plant Scale of a Reduced Activation Ferritic/Martensitic RAFM Steel, Asturfer®

2010 ◽  
Vol 73 ◽  
pp. 36-40 ◽  
Author(s):  
Ana Morán ◽  
Rubén Coto ◽  
Javier Belzunce ◽  
Jose Manuel Artímez
Keyword(s):  
Stainless Steels ◽  
Pilot Plant ◽  
Austenitic Stainless Steels ◽  
Martensitic Steels ◽  
Font Size ◽  
Experimental Development ◽  
Pilot Plant Scale ◽  
Fusion Material ◽  
Rafm Steel ◽  
The Eu

<span><span style="font-family: Times New Roman;">Ferritic/Martensitic steels, with chromium contents ranging between 9 and 12%, were introduced into fusion material programs due to their better creep resistance and excellent thermal and nuclear properties compared to austenitic stainless steels. Reduced activation ferritic/martensitic (RAFM) steels are considered promising candidates for the test blanket modules of the future International Thermonuclear Experimental Reactor (ITER), being EUROFER steel is the EU reference material. It is a 9 % Cr RAFM steel which exhibits a tempered martensitic <span style="font-family: Times New Roman;">microstructure and presently allows operation up to 550 </span><span style="font-family: Cambria Math;">⁰</span><span style="font-family: Times New Roman;">C. This paper shows the work carried out</span></span><span style="font-family: Times New Roman;"><span style="font-family: Times New Roman;"> to develop at a pilot plant scale a Reduced Activation Ferritic/Martensitic (RAFM) steel, Asturfer </span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">®</span></span><span style="font-family: Times New Roman;">,</span></span><span style="font-family: Times New Roman;"> with chemical composition and mechanical properties very close to EUROFER steel. </span>

scholarly journals Microstructure and properties degradation of P/T 91, 92 steels weldments in creep conditions

2012 ◽  
Vol 48 (3) ◽  
pp. 461-469 ◽  
Author(s):  
L. Falat ◽  
V. Homolová ◽  
J. Kepic ◽  
M. Svoboda ◽  
A. Výrostková
Keyword(s):  
Filler Metal ◽  
Light And Electron Microscopy ◽  
Microstructural Change ◽  
Fusion Welding ◽  
Inert Gas ◽  
Martensitic Steels ◽  
Equilibrium Thermodynamic ◽  
Type Iv ◽  
Creep Exposure ◽  
Good Agreement

The studies were performed on dissimilar ferritic/austenitic weldments between 9Cr tempered martensitic steels of the grades either P/T 91 or 92 and unstabilised AISI316H austenitic steel. The welded joints were fabricated using the fusion welding by tungsten inert gas (TIG) method with Ni-based filler metal. Microstructural analyses were performed using light and electron microscopy. Microstructural gradient in heat-affected zone (HAZ) of 9Cr steels remained preserved during creep exposure. All weldments fractured by the type IV failure within their intercritical HAZ (ICHAZ) regions. The most remarkable microstructural change during creep was the precipitation of intermetallic Laves phase. Experimentally determined phases of the samples after creep exposure are in good agreement with equilibrium thermodynamic calculations.

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