On the nature of internal interfaces in a tempered martensite ferritic steel and their evolution during long-term creep

2012 ◽  
Vol 66 (12) ◽  
pp. 1045-1048 ◽  
Author(s):  
E.J. Payton ◽  
A. Aghajani ◽  
F. Otto ◽  
G. Eggeler ◽  
V.A. Yardley
Keyword(s):  
Ferritic Steel ◽  
Tempered Martensite ◽  
Term Creep

On the formation and growth of Mo-rich Laves phase particles during long-term creep of a 12% chromium tempered martensite ferritic steel

2009 ◽  
Vol 61 (11) ◽  
pp. 1068-1071 ◽  
Author(s):  
A. Aghajani ◽  
F. Richter ◽  
C. Somsen ◽  
S.G. Fries ◽  
I. Steinbach ◽  
...  
Keyword(s):  
Ferritic Steel ◽  
Laves Phase ◽  
Tempered Martensite ◽  
Term Creep

TEM replica analysis of particle phases in a tempered martensite ferritic Cr steel after long term creep

2021 ◽  
pp. 111396
Author(s):  
H. Wang ◽  
A. Kostka ◽  
W.E. Goosen ◽  
G. Eggeler ◽  
J.E. Westraadt
Keyword(s):  
Tempered Martensite ◽  
Term Creep

Formation of the Fe2Hf Laves Phase through Eutectoid Type Reaction of δ→γ+Fe2Hf in Ferritic Heat Resistant Steels

2015 ◽  
Vol 1760 ◽  
Author(s):  
Satoru Kobayashi
Keyword(s):  
Phase Transformation ◽  
Ferritic Steel ◽  
Laves Phase ◽  
Ferritic Steels ◽  
Microstructural Observation ◽  
Interphase Precipitation ◽  
Δ Ferrite ◽  
Term Creep ◽  
Heat Resistant Steels

ABSTRACTPeriodically arrayed rows of fine Fe2Hf Laves phase particles were found to form in 9Cr ferritic steel. Microstructural observation demonstrates that the particles were formed on cooling through the interphase precipitation on the phase transformation from the δ ferrite to the γ austenite along the eutectoid transformation route of δ → γ+Fe2Hf and subsequently a phase transformation from the austenite to the α ferrite took place. This eutectoid route is expected to be effectively used for improving the long term creep strength of ferritic steels with Laves phase.

Creep Damage Evaluation by Hardness in Advanced High Cr Ferritic Steels

2007 ◽  
Vol 561-565 ◽  
pp. 2217-2220 ◽  
Author(s):  
Hassan Ghassemi Armaki ◽  
Kyosuke Yoshimi ◽  
Kouichi Maruyama ◽  
Mitsuru Yoshizawa ◽  
Masaaki Igarashi
Keyword(s):  
Activation Energy ◽  
Rupture Life ◽  
Creep Damage ◽  
Ferritic Steels ◽  
Tempered Martensite ◽  
Short Term ◽  
Term Creep ◽  
Martensitic Lath ◽  
Short Term Creep

The apparent activation energy for rupture life sometimes changes from a high value of short term creep to a low value of long term creep. This change results in overestimation of rupture life recognized recently in advanced high Cr ferritic steels. The present study examined how to detect the decrease of activation energy in 9-12 %Cr steels with tempered martensitic lath microstructure. During aging without stress hardness of the tempered martensite microstructures remains almost constant in short term, whereas it decreases with increasing time after long term exposure. The onset of hardness drop can be a good measure of the decrease of activation energy. Causes of the hardness drop and the decrease of activation energy are discussed.

Prediction of Creep Deformation and Failure for 1/2 Cr-1/2 Mo-1/4 V and 2-1/4 Cr-1 Mo Steels

1985 ◽  
Vol 107 (3) ◽  
pp. 279-284 ◽  
Author(s):  
J. D. Parker
Keyword(s):  
Creep Strain ◽  
Creep Deformation ◽  
Ferritic Steel ◽  
Life Assessment ◽  
Creep Life ◽  
Deformation And Failure ◽  
Extrapolation Technique ◽  
Plant Life ◽  
Term Creep

This paper reviews the development of an equation for the prediction of long-term creep strain and creep life. Originally, this relationship was successfully applied to 1/2 Cr-1/2 Mo-1/4 V ferritic steel, and present data suggest similar success with the 2-1/4 Cr-1 Mo material. The implications of this extrapolation technique are discussed and the consequences for plant-life assessment are considered.

scholarly journals Effect of Initial Microstructure on Long Term Creep Strength of a Low Alloy Ferritic Steel

2000 ◽  
Vol 86 (8) ◽  
pp. 542-549 ◽  
Author(s):  
Kazuhiro KIMURA ◽  
Hideaki KUSHIMA ◽  
Eiji BABA ◽  
Tetsuo SHIMIZU ◽  
Yoshikazu ASAI ◽  
...  
Keyword(s):  
Creep Strength ◽  
Ferritic Steel ◽  
Initial Microstructure ◽  
Term Creep
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