Quantitative evaluation of hydrogen embrittlement susceptibility in various steels for energy use using an in-situ small punch test

2021 ◽  
Author(s):  
Kyung-Oh Bae ◽  
Hyung-Seop Shin ◽  
Un-Bong Baek
Keyword(s):  
Hydrogen Embrittlement ◽  
Quantitative Evaluation ◽  
Energy Use ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Validation of the Incremental Step Loading Technique Application to Small Punch Tests in Aggressive Environments in X80 Steel

2020 ◽  
Author(s):  
B. Arroyo ◽  
L. Andrea ◽  
P. González ◽  
J. A. Álvarez ◽  
S. Cicero ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Embrittlement ◽  
Threshold Stress ◽  
High Strength ◽  
Constant Load ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Step Loading ◽  
Incremental Step

Abstract The Small punch test, which consists on punching a small plane specimen up to failure, is a technique to be taken into account for the estimation of mechanical properties when there is shortage of material. In recent works it has been applied to the estimation of mechanical properties steels in aggressive environments. In aggressive environments, tests under a constant load are usually employed for the threshold stress determination, but this a slow and sometimes inaccurate technique. The standard ASTM F1624 solves these issues; it consists on applying steps of constant loads subsequently increased up to the specimen’s failure. In a previous work, it was indicated how to implement this technique for Small Punch testing of steels in hydrogen embrittlement scenarios, adapting the steps duration. This proposal allows to obtain a threshold load by using at least 3 specimens in a total time of around a week. In the present work, the incremental step loading technique from ASTM F1624 standard is applied to the Small Punch test in order to estimate tensile threshold stress of a X80 high strength steel in hydrogen embrittlement environments by cathodic polarization in an acid electrolyte. Regular standard tests on cylindrical tensile specimens were carried out following the ASTM F1624 standard, in order to validate the methodology proposed.

scholarly journals A novel methodology for estimating tensile properties in a small punch test employing in-situ DIC based deflection mapping

2020 ◽  
Vol 538 ◽  
pp. 152260
Author(s):  
V.D. Vijayanand ◽  
M. Mokhtarishirazabad ◽  
J. Peng ◽  
Y. Wang ◽  
M. Gorley ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Rate effects on the estimation of fracture toughness by small punch tests in hydrogen embrittlement

2019 ◽  
Vol 54 (7-8) ◽  
pp. 390-400 ◽  
Author(s):  
Borja Arroyo ◽  
Jose Alberto Álvarez ◽  
Federico Gutiérrez-Solana ◽  
Roberto Lacalle ◽  
Pablo González
Keyword(s):  
Fracture Toughness ◽  
Hydrogen Embrittlement ◽  
Slow Rate ◽  
Environment Interaction ◽  
Small Punch Test ◽  
Small Punch ◽  
Notched Specimens ◽  
Punch Test ◽  
Material Environment ◽  
Rate Effects

In this article, different techniques to test notched small punch test samples in fracture conditions in aggressive environments are studied, based on the comparison of the micromechanisms at different rates. Pre-embrittled samples subsequently tested in air at rates conventionally employed (0.01 and 0.002 mm/s) are compared to embrittled ones tested in environment at the same rates (0.01 and 0.002 mm/s) and at a very slow rate (5E–5 mm/s). A set of samples tested in environment under a set of constant loads that produce very slow rates completes the experimental results. As a conclusion, it is recommended to test small punch test notched specimens in environment at very slow rates, of around E–6 mm/s, when characterizing in hydrogen embrittlement scenarios, in order to allow the material–environment interaction to govern the process.

Development of a methodology to study the hydrogen embrittlement of steels by means of the small punch test

2015 ◽  
Vol 626 ◽  
pp. 342-351 ◽  
Author(s):  
T.E. García ◽  
C. Rodríguez ◽  
F.J. Belzunce ◽  
I. Peñuelas ◽  
B. Arroyo
Keyword(s):  
Hydrogen Embrittlement ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

A Perspective of the Small Punch Test Application to the Evaluation of Hydrogen Embrittlement in Steels: Effect of Punch Rate on Fracture Properties

2018 ◽  
Author(s):  
B. Arroyo ◽  
J. A. Álvarez ◽  
F. Gutiérrez-Solana ◽  
J. Sainz ◽  
R. Lacalle
Keyword(s):  
Hydrogen Embrittlement ◽  
Small Punch Test ◽  
Static Loads ◽  
Fracture Properties ◽  
Small Punch ◽  
Notched Specimens ◽  
Punch Test ◽  
Test Application ◽  
Material Environment ◽  
The One

In this paper, different techniques to test notched Small Punch (SPT) samples for the estimation of the fracture properties in aggressive environments are studied, based on the comparison of the micromechanisms at different rates. Pre-embrittled samples subsequently tested in air at conventional rates (0.01 and 0.002 mm/s) are compared to embrittled ones tested in environment at the same rates (0.01 and 0.002 mm/s) and at a very slow rate (5E−5 mm/s); a set of samples tested in environment under static loads that produce very slow rates complete the experimental results. To close the study, numerical simulations based on obtaining a punch rate that produces an equivalent CTOD growing rate in the edge of the notch to the one at the crack tip of a C(T) specimen for a given solicitation rate is carried out. As a conclusion, is recommended to test SPT notched specimens in environment at very slow rates, of arround E−6 mm/s, when characterizing in Hydrogen Embrittlement (HE) scenarios, in order to allow the interaction material-environment to govern the process.

Sign in / Sign up

Export Citation Format

Share Document