scholarly journals Technical Letter Report of Slow-Strain-Rate Tensile Tests on Irradiated Stainless Steels in a PWR Environment

2013 ◽  
Author(s):  
Y. Chen ◽  
W. Soppet ◽  
B. Alexandreanu ◽  
K. Natesan
Keyword(s):  
Strain Rate ◽  
Stainless Steels ◽  
Tensile Tests ◽  
Slow Strain Rate

A Comparison of Hydrogen and Mercury Embrittlement in Monel at Room Temperature

1986 ◽  
Vol 108 (1) ◽  
pp. 31-36 ◽  
Author(s):  
L. B. Traylor ◽  
C. E. Price
Keyword(s):  
Crack Initiation ◽  
Strain Rate ◽  
Room Temperature ◽  
Tensile Tests ◽  
Cohesive Strength ◽  
Slow Strain Rate ◽  
Transgranular Crack ◽  
Monel 400

Slow strain rate tensile tests were performed on annealed and cold drawn Monel 400 and Monel R405 at room temperature in air, mercury, and electrolyte hydrogen. Hydrogen and mercury caused embrittlement with the fractures having the same specific features. Crack initiation was largely intergranular but an increasing proportion of transgranular cracking occurred subsequently, especially in the presence of hydrogen and for Monel R405. It is believed that the decreased cohesive strength and enhanced shear models of embrittlement apply to the intergranular and transgranular crack modes respectively.

Slow Strain Rate Fracture Characteristics of Steel and Aluminum Alloys Tested in Mercury Environments

1989 ◽  
Vol 111 (3) ◽  
pp. 229-234 ◽  
Author(s):  
J. J. Krupowicz
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Slow Strain Rate ◽  
304 Stainless Steel ◽  
Mercury Species ◽  
Ambient Conditions ◽  
Aluminum Alloy 5083 ◽  
Type 304

Slow strain rate tensile tests performed on Type 304 stainless steel, A516 Grade 70 C-Mn steel, and aluminum alloy 5083 revealed that all three materials were susceptible to varying degrees of mercury liquid metal embrittlement (LME) at ambient conditions. Both Type 304 stainless and A516 Grade 70 C-Mn steels exhibited significant strain rate sensitivity to LME, while aluminum alloy 5083 embrittlement was independent of strain rate over the range tested (8.3 × 10−3 to 5.0 × 10−7 s−1). Ductility (reduction in area) and toughness losses for tests in mercury compared to respective tests in air indicated that aluminum alloy 5083 embrittlement was more acute than either steel. Crack arrest (secondary cracking) characteristics and reactions to different mercury species also suggested that Type 304 stainless and A516 Grade 70 C-Mn steels were less susceptible to mercury LME than aluminum alloy 5083.

Hydrogen-Induced Ductility Loss of Austenitic Stainless Steels for Slow Strain Rate Tensile Testing in High-Pressure Hydrogen Gas

2016 ◽  
Vol 258 ◽  
pp. 259-264
Author(s):  
Saburo Matsuoka ◽  
Junichiro Yamabe ◽  
Hisao Matsunaga
Keyword(s):  
High Pressure ◽  
Strain Rate ◽  
Crack Growth ◽  
Stainless Steels ◽  
Surface Crack ◽  
Austenitic Stainless Steels ◽  
Hydrogen Gas ◽  
Slow Strain Rate ◽  
Relative Reduction ◽  
Pressure Hydrogen

For slow strain rate tensile (SSRT) test in hydrogen gas, the degradation in relative reduction in area (RRA) of 300-series austenitic stainless steels is mainly attributed to hydrogen-assisted surface crack growth (HASCG) accompanied by quasi-cleavages. To establish novel criteria for authorizing various austenitic stainless steels for use in high-pressure gaseous hydrogen, a mechanism of the HASCG should be elucidated. At first, this study performed SSRT tests on six types of austenitic stainless steels, Types 304, 316, 316L, 306(hi-Ni), 304N2 and 304(N), in high-pressure hydrogen gas and showed that the RRAs were successfully quantified in terms of a newly-proposed nickel-equivalent equation. Then, to elucidate the microscopic mechanism of the HASCG, elasto-plastic fracture toughness (JIC), fatigue crack growth (FCG) and fatigue life tests on Types 304, 316 and 316L were carried out in high-pressure hydrogen gas. The results demonstrated that the SSRT surface crack grew via the same mechanism as for the JIC and fatigue cracks, i.e., these cracks successively grow with a sharp shape under the loading process, due to local slip deformations near the crack tip by hydrogen. Detailed observations of SSRT surface cracks on Types 304 and 316L were also performed, exhibiting that the onset of the HASCG occurred at the true strain of 0.1 or larger in high-pressure hydrogen gas.

scholarly journals Modification of the Johnson-cook Model for the Strain Rate Effect On Tensile Properties of 304/316 Austenitic Stainless Steels

2021 ◽  
Author(s):  
Jun-Min Seo ◽  
Sang-Seop Jeong ◽  
Yun-Jae Kim ◽  
Jin Weon Kim ◽  
Chang-Young Oh ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Strain Rate ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Strain And Strain Rate ◽  
Cook Model

Abstract In this study, tensile tests of 304 and 316 austenitic stainless steels at various strain rate were performed to investigate the strain rate effect on tensile properties. It is shown that the strain rate effect on stress depends not only on the strain rate but also on the plastic strain level. Accordingly, a modification of the existing Johnson-Cook model is proposed to incorporate the interacting effect of plastic strain and strain rate for 304 and 316 austenitic stainless steels. Although improvement is not significant, the proposed modified Johnson-Cook model can reduce the difference from the experimental data at various strain levels, compared to the existing Johnson-Cook model.

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