Dependence of hydrogen-induced lattice defects and hydrogen embrittlement of cold-drawn pearlitic steels on hydrogen trap state, temperature, strain rate and hydrogen content

2014 ◽  
Vol 79 ◽  
pp. 93-107 ◽  
Author(s):  
Tomoki Doshida ◽  
Kenichi Takai
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Hydrogen Content ◽  
Lattice Defects ◽  
Trap State ◽  
Hydrogen Trap ◽  
Temperature Strain

F4-5 Atomistic study of hydrogen-trap state to lattice defects

2008 ◽  
Vol 2008.21 (0) ◽  
pp. 41-42
Author(s):  
Ryosuke MATSUMOTO ◽  
Shinya TAKETOMI ◽  
Noriyuki MIYAZAKI
Keyword(s):  
Lattice Defects ◽  
Trap State ◽  
Hydrogen Trap ◽  
Atomistic Study

Study on Susceptibility of Hydrogen Embrittlement in a Tool Steel

2007 ◽  
Vol 561-565 ◽  
pp. 103-106 ◽  
Author(s):  
X.T. Wang ◽  
Tadeusz Siwecki
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Tool Steel ◽  
Hydrogen Content ◽  
Tensile Tests ◽  
Hydrogen Level ◽  
Low Strain Rate

Susceptibility of hydrogen embrittlement of a super grade AISI 420 tool steel was studied. Tensile samples were cathodically charged to different hydrogen level. Hydrogen induced mechanical property degradation was measured by tensile tests at a low strain rate. Fractography of broken surfaces was observed using SEM. Relationship between hydrogen content and tensile strength and elongation were studied. Critical hydrogen contents were obtained for different heat treatment states. It was found that for annealed materials could stand for a 3.5ppm hydrogen for keeping 80% of original ductility, and the effect of hydrogen on strength was unobvious. However, for material quenched and tempered at 250°C, only 0.3ppm hydrogen could lead the ductility drop to 80% of original. The material quenched and tempered at 500°C was more sensitive on hydrogen, less than 1ppm hydrogen could lead the strength drop to 80% of original.

Hydrogen Embrittlement of Low Carbon HSLA Steel during Slow Strain Rate Test

2011 ◽  
Vol 197-198 ◽  
pp. 642-645
Author(s):  
Jing Wei Zhao ◽  
Young Soo Chun ◽  
Chong Soo Lee
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Hydrogen Content ◽  
Hsla Steel ◽  
Peak Stress ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Low Carbon ◽  
Diffusible Hydrogen ◽  
Rate Test

The hydrogen embrittlement of a low carbon HSLA steel has been investigated by means of slow strain rate test (SSRT) on circumferentially notched specimens. Hydrogen was introduced into specimens by electrochemical charging and the diffusible hydrogen content was measured by thermal desorption spectrometry (TDS) analysis. The activation energy of hydrogen desorption in the present steel was calculated to be 12.75 kJ/mol after TDS analysis. The peak stress and displacement during notch tensile tests had been found to decrease simultaneously with diffusible hydrogen content, which could be expressed by two power law relationships, respectively. Fracture surface was a cleavage type indicating that the steel had high susceptibility of hydrogen embrittlement.

scholarly journals Effect of Strain Rate on the Hydrogen Embrittlement Property of Ultra High-strength Low-alloy TRIP-aided Steel

2019 ◽  
Vol 105 (4) ◽  
pp. 443-451 ◽  
Author(s):  
Tomohiko Hojo ◽  
Riko Kikuchi ◽  
Hiroyuki Waki ◽  
Fumihito Nishimura ◽  
Yuko Ukai ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
High Strength

High Temperature Deformation Mechanism Maps of NiAl

2004 ◽  
Vol 449-452 ◽  
pp. 57-60
Author(s):  
I.G. Lee ◽  
A.K. Ghosh
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Deformation Mechanism ◽  
Calculation Method ◽  
Deformation Behavior ◽  
Tensile Tests ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Grain Sizes ◽  
Temperature Strain

In order to analyze high temperature deformation behavior of NiAl alloys, deformation maps were constructed for stoichiometric NiAl materials with grain sizes of 4 and 200 µm. Relevant constitute equations and calculation method will be described in this paper. These maps are particularly useful in identifying the location of testing domains, such as creep and tensile tests, in relation to the stress-temperature-strain rate domains experienced by NiAl.

Study on Material Constant Values of Ti-6Al-4V-Rare Earth Titanium

2012 ◽  
Vol 557-559 ◽  
pp. 80-84
Author(s):  
Pei Feng Zhao ◽  
Qing Fu Wang
Keyword(s):  
Rare Earth ◽  
Strain Rate ◽  
Dynamic Recovery ◽  
Material Constant ◽  
Compressive Test ◽  
Sensitive Material ◽  
Positive Strain ◽  
Softening Process ◽  
Temperature Strain ◽  
Single Regression

According to hot compressive test date, relationship between flow stress, temperature, strain rate and strain is studied. Material constant value is researched through single regression, such as activation energy Q, stress level parameters and structure factor A. The results show dynamic recovery is principal in the softening process of .titanium and Ti-6Al-4V-Rare Earth Titanium is positive strain rate sensitive material.

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