The Role of Co-injected Helium on Swelling and Cavity Evolution at High Damage Levels in Ferritic-Martensitic Steels

2021 ◽  
pp. 152912
Author(s):  
D. Woodley ◽  
S. Taller ◽  
Z. Jiao ◽  
K. Sun ◽  
G.S. Was
Keyword(s):  
Martensitic Steels ◽  
Cavity Evolution

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.

The Role of Alloy Composition on the Steam Oxidation Resistance of 9-12%Cr Steels

2006 ◽  
Vol 522-523 ◽  
pp. 129-138 ◽  
Author(s):  
Stephen Osgerby ◽  
A. Tony Fry
Keyword(s):  
Oxide Layer ◽  
Defect Structure ◽  
Alloy Composition ◽  
Steam Oxidation ◽  
Oxide Scales ◽  
Martensitic Steels ◽  
Minor Elements ◽  
Composition Modification ◽  
Gas Penetration

Three commercial martensitic steels have been oxidised in steam at 600 and 650 °C for times up to 10000 h. The partition of minor elements within the oxide scales has been determined. Silicon forms an additional oxide layer beneath the spinel. Chromium, molybdenum and tungsten concentrate in the spinel and manganese is present in both the spinel and magnetite. Several proposed mechanisms for steam oxidation have been examined to explain the observed effects of alloy composition. Modification of the oxide defect structure and oxidant gas penetration through microcracks were identified as the mechanisms most able to explain the influence of alloy composition.

Role of Mo/V carbides in hydrogen embrittlement of tempered martensitic steel

2015 ◽  
Vol 33 (6) ◽  
pp. 433-441 ◽  
Author(s):  
Junmo Lee ◽  
Taekyung Lee ◽  
Young Jin Kwon ◽  
Dong-Jun Mun ◽  
Jang-Yong Yoo ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Hydrogen Embrittlement ◽  
Beneficial Effect ◽  
Mechanical Performance ◽  
Martensitic Steel ◽  
Carbide Precipitation ◽  
Hydrogen Trapping ◽  
Martensitic Steels ◽  
Cr Addition

AbstractThe vulnerability of tempered martensitic steel to hydrogen embrittlement (HE) has attracted attention from a number of researchers. Although utilizing carbide precipitation is one of effective methods to improve HE resistance, few studies have focused on the effects of carbide characteristics, such as the chemical composition and morphology of carbide. This work clarifies the role of Mo carbide and V carbide in the HE behavior of tempered martensitic steels with four steels whose chemical composition was carefully controlled. The beneficial effect of carbides is discussed in terms of hydrogen trapping and fracture mode. The low amount of trapped hydrogen and undissolved carbide led to excellent HE resistance of Mo carbides compared to V carbides. In addition, the superior mechanical performance of Cr-Mo steel was also interpreted by the effect of Cr addition as well as Mo carbides.

M 4 C 3 precipitation in Fe–C–Mo–V steels and relationship to hydrogen trapping

2006 ◽  
Vol 462 (2072) ◽  
pp. 2315-2330 ◽  
Author(s):  
S Yamasaki ◽  
H.K.D.H Bhadeshia
Keyword(s):  
Kinetic Theory ◽  
Hydrogen Trapping ◽  
Martensitic Steels ◽  
Hydrogen Atoms ◽  
Elastic Interactions ◽  
Dissolved Hydrogen ◽  
Coherency Strains ◽  
Carbide Particles

Strong steels suffer from embrittlement due to dissolved hydrogen, a phenomenon which can be mitigated by trapping the hydrogen at carbide particles, where it is rendered benign. The precipitation and coarsening of plate-like M 4 C 3 carbides, during the tempering of quaternary Fe–C–Mo–V martensitic steels, has been characterized both experimentally and by developing appropriate kinetic theory. The trapping capacity is found to peak when the carbides are about 10 nm in length, indicating a role of coherency strains in trapping hydrogen atoms via elastic interactions. This suggests a method for developing alloys which are better able to resist the detrimental effects of hydrogen.

A dual ion irradiation study of helium–dpa interactions on cavity evolution in tempered martensitic steels and nanostructured ferritic alloys

2014 ◽  
Vol 449 (1-3) ◽  
pp. 190-199 ◽  
Author(s):  
Takuya Yamamoto ◽  
Yuan Wu ◽  
G. Robert Odette ◽  
Kiyohiro Yabuuchi ◽  
Sosuke Kondo ◽  
...  
Keyword(s):  
Ion Irradiation ◽  
Martensitic Steels ◽  
Ferritic Alloys ◽  
Cavity Evolution

The influence of carbon on cavity evolution in ion-irradiated ferritic-martensitic steels

2018 ◽  
Vol 509 ◽  
pp. 722-735 ◽  
Author(s):  
Anthony M. Monterrosa ◽  
David Woodley ◽  
Zhijie Jiao ◽  
Gary S. Was
Keyword(s):  
Martensitic Steels ◽  
Cavity Evolution

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

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