Determination of the critical hydrogen concentration for delayed fracture of high strength steel by constant load test and numerical calculation

2006 ◽  
Vol 48 (8) ◽  
pp. 2189-2202 ◽  
Author(s):  
Maoqiu Wang ◽  
Eiji Akiyama ◽  
Kaneaki Tsuzaki
Keyword(s):  
Numerical Calculation ◽  
Hydrogen Concentration ◽  
High Strength Steel ◽  
High Strength ◽  
Constant Load ◽  
Load Test ◽  
Delayed Fracture

scholarly journals Determination of Critical Hydrogen Concentration and Its Effect on Mechanical Performance of 2200 MPa and 600 HBW Martensitic Ultra-High-Strength Steel

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 984
Author(s):  
Eric Fangnon ◽  
Yuriy Yagodzinskyy ◽  
Evgenii Malictki ◽  
Saara Mehtonen ◽  
Esa Virolainen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Hydrogen Concentration ◽  
Mechanical Performance ◽  
Thermal Desorption Spectroscopy ◽  
Local Stress ◽  
High Strength ◽  
Constant Load ◽  
Strength Degradation ◽  
Load Test ◽  
Extension Rate

The influence of hydrogen on the mechanical performance of a hot-rolled martensitic steel was studied by means of constant extension rate test (CERT) and constant load test (CLT) followed with thermal desorption spectroscopy measurements. The steel shows a reduction in tensile strength up to 25% of ultimate tensile strength (UTS) at critical hydrogen concentrations determined to be about 1.1 wt.ppm and 50% of UTS at hydrogen concentrations of 2 wt.ppm. No further strength degradation was observed up to hydrogen concentrations of 4.8 wt.ppm. It was observed that the interplay between local hydrogen concentrations and local stress states, accompanied with the presence of total average hydrogen reducing the general plasticity of the specimen are responsible for the observed strength degradation of the steel at the critical concentrations of hydrogen. Under CLT, the steel does not show sensitivity to hydrogen at applied loads below 50% of UTS under continuous electrochemical hydrogen charging up to 85 h. Hydrogen enhanced creep rates during constant load increased linearly with increasing hydrogen concentration in the steel.

Constant-load delayed fracture test of atmospherically corroded high strength steels

2011 ◽  
Vol 257 (19) ◽  
pp. 8275-8281 ◽  
Author(s):  
Eiji Akiyama ◽  
Katsuhiro Matsukado ◽  
Songjie Li ◽  
Kaneaki Tsuzaki
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Constant Load ◽  
Fracture Test ◽  
Delayed Fracture

Determination of continuous constitutive relationship of weld zone of high-strength steel rectangular welded tube

2020 ◽  
Vol 27 (10) ◽  
pp. 1212-1225
Author(s):  
Hai-long Liu ◽  
Yu-li Liu ◽  
Zhong Yang ◽  
Kun Wang ◽  
Meng-meng Liu
Keyword(s):  
High Strength Steel ◽  
Weld Zone ◽  
High Strength ◽  
Constitutive Relationship ◽  
Welded Tube ◽  
Relationship Of

scholarly journals Evaluation of Delayed Fracture Characteristics of High Strength Steel based on CSRT Method

2008 ◽  
Vol 94 (6) ◽  
pp. 215-221 ◽  
Author(s):  
Yukito Hagihara ◽  
Chikahito Ito ◽  
Noriyuki Hisamori ◽  
Hiroshi Suzuki ◽  
Kenichi Takai ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Delayed Fracture ◽  
Fracture Characteristics

scholarly journals Experimental determination of continuous cooling transformation diagram for high strength steel X153CrMoV12

2021 ◽  
Vol 16 (1) ◽  
pp. 19-24
Author(s):  
Michal Krbaťa ◽  
◽  
Róbert Cíger ◽  
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
High Strength Steel ◽  
Microstructural Analysis ◽  
High Strength ◽  
Cooling Curves ◽  
Treatment Mode ◽  
Heat Treatment Mode ◽  
Continuous Cooling Transformation Diagram

The article is a continuation of the article ,DILATOMETRIC ANALYSIS OF COOLING CURVES FOR HIGH STRENGTH STEEL X153CrMoV12”, which deals with the phase transformations of tool steel X153CrMoV12. The experimental data obtained was used to evaluate the resulting CCT diagram, which consists of seven dilation curves. All experimental samples from dilatometric analyses were then subjected to microstructural analysis and hardness measurements to characterize the microstructure and hardness for each heat treatment mode tested. AFM microscopy was also used to study the carbides present in steels and their size and shape for all selected cooling modes.

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