The Potential of the Internal Friction Technique to Evaluate the Role of Vacancies and Dislocations in the Hydrogen Embrittlement of Steels

2021 ◽  
pp. 2100037
Author(s):  
Liese Vandewalle ◽  
Milan J. Konstantinović ◽  
Tom Depover ◽  
Kim Verbeken
Keyword(s):  
Hydrogen Embrittlement ◽  
Internal Friction

Role of gaseous impurities in the hydrogen‐embrittlement of steel

1977 ◽  
Vol 14 (1) ◽  
pp. 588-592 ◽  
Author(s):  
V. Srikrishnan ◽  
P. J. Ficalora
Keyword(s):  
Hydrogen Embrittlement

Role of γ′ characteristic on the hydrogen embrittlement susceptibility of Fe–Ni–Cr alloys

2015 ◽  
Vol 101 ◽  
pp. 75-83 ◽  
Author(s):  
Shenghu Chen ◽  
Mingjiu Zhao ◽  
Lijian Rong
Keyword(s):  
Hydrogen Embrittlement

Role of elongated MnS inclusions in hydrogen embrittlement of high-strength steels

Metal Science ◽  
1982 ◽  
Vol 16 (12) ◽  
pp. 543-554 ◽  
Author(s):  
T. V. Venkatasubramanian ◽  
T. J. Baker
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength Steels ◽  
High Strength

OS2102 Role of deformation twin on hydrogen embrittlement of TWIP steels

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS2102-1_-_OS2102-2_
Author(s):  
Motomichi Koyama ◽  
Eiji Akiyama ◽  
Kaneaki Tsuzaki
Keyword(s):  
Hydrogen Embrittlement ◽  
Deformation Twin ◽  
Twip Steels

The Role Of Microstructures And The Diffusion Of Hydrogen In A Plain Carbon Eutectoid Steel For Pressure Vessels

2012 ◽  
Author(s):  
Ronnie Higuchi Rusli
Keyword(s):  
Hydrogen Embrittlement ◽  
Room Temperature ◽  
Pressure Vessels ◽  
Electrochemical Technique ◽  
Eutectoid Steel ◽  
Chemical Pressure ◽  
Hydrogen Retention ◽  
Cold Worked ◽  
Diffusion Of Hydrogen

An electrochemical technique was used to measure the room temperature diffusivity and trapping of hydrogen in a 0.82%C steel for chemical pressure vessels in two micro structural conditions (a) the cold worked pearlitic state and (b) the hardened and tempered state. Trapping of hydrogen occurs in both structures but with more traps in the cold worked structure. Base on experimental results and observation, different hydrogen retention (trapping) behavior operates in the two structures. It was also found that patented and cold worked steels are much less susceptible to hydrogen induced embrittlement than similar steels in the hardened and tempered condition. Key words: Diffusivity of hydrogen; hydrogen embrittlement; cold–worked

scholarly journals Role of Microstructure in Susceptibility of X70 Pipeline Steel to Hydrogen Embrittlement

2010 ◽  
Vol 654-656 ◽  
pp. 162-165 ◽  
Author(s):  
D. Hejazi ◽  
A.J. Haq ◽  
N. Yazdipour ◽  
D.P. Dunne ◽  
Frank J. Barbaro ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Fracture Surface ◽  
Heat Affected Zone ◽  
Pipeline Steel ◽  
Rolled Strip ◽  
Bend Tests ◽  
Point Bend ◽  
Hot Rolled ◽  
Surface Observations

In order to investigate the susceptibility of steels to hydrogen embrittlement as a function of their microstructure X70 steel was chosen in different conditions: normalized transfer bar, as-received hot rolled strip and heat affected zone (HAZ). Notched and fatigue pre-cracked samples were subjected to electrochemical hydrogen charging to achieve 2 ppm hydrogen content. Three point bend tests were conducted on as-received and hydrogen charged samples. The results showed that HAZ samples are more susceptible to hydrogen embrittlement than the others. This was supported by fracture surface observations.

Mechanical Spectroscopy of Hyperstabilized Martensites

2012 ◽  
Vol 184 ◽  
pp. 355-360 ◽  
Author(s):  
Sergey Kustov ◽  
R. Santamarta ◽  
E. Cesari ◽  
K. Sapozhnikov ◽  
V. Nikolaev ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Internal Friction ◽  
Essential Role ◽  
Parent Phase ◽  
Martensitic Transformation Temperature ◽  
Mechanical Spectroscopy ◽  
Internal Friction Peak ◽  
Pinning Effect ◽  
The One

The internal friction of the hyperstabilized martensite demonstrates very low values, both above and below the nominal martensitic transformation temperature, due to a pronounced pinning effect. Over a wide temperature range it is comparable with the level of damping in the parent phase. A study of the temperature dependence of the non-linear ultrasonic internal friction and its strain amplitude hysteresis indicates that the diffusion, assisted by dislocations/interfaces, is quite pronounced and in Ni-Fe-Ga and Cu-Al-Be alloys it operates at temperatures around 20 K. The renucleation of the lamellar parent phase during the reverse martensitic transformation close to 600 K is accompanied by an internal friction peak which demonstrates a substantial transitory contribution. After renucleation of the parent phase the samples recover a conventional martensitic transformation with the internal friction level in the martensite comparable to the one in non-stabilized samples. Observations of a relaxation peak in the parent phase of different alloys for temperatures just below the renucleation stage of the reverse transformation point to the essential role of diffusion in the nucleation of the parent phase in hyperstabilized martensites.

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