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Keywords: Hydrogen embrittlement
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Proceedings Papers

Proc. ASME. PVP2021, Volume 2: Computer Technology and Bolted Joints; Design and Analysis, V002T03A021, July 13–15, 2021
Paper No: PVP2021-61954
... pressurization temperature (MPT) envelopes for these reactors, both temper and hydrogen embrittlement effects must be considered. However, there are no specific rules to evaluate loss of toughness due to hydrogen embrittlement in the design Codes / fitness-for-service Standards. Earlier, Japanese steel...
Proceedings Papers

Proc. ASME. PVP2021, Volume 3: Fluid Structure Interaction; High Pressure Technology, V003T05A001, July 13–15, 2021
Paper No: PVP2021-60453
... the mechanical properties and fatigue endurance were deeply investigated in recent years, the resistance of SLMed Inconel 718 to the Hydrogen Embrittlement (HE) requires further investigation. The present paper deals with the effects of the SLM process on reducing the strength and ductility of Inconel 718...
Proceedings Papers

Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A055, July 13–15, 2021
Paper No: PVP2021-62436
..., but reduced ductility. Magnetic evaluation of the uniformly strained region of the test specimens suggest that hydrogen mitigates the strain-induced transformation to α’-martensite. Brittle fracture features and secondary cracking indicative of hydrogen embrittlement were observed on the fracture surfaces...
Proceedings Papers

Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A054, July 13–15, 2021
Paper No: PVP2021-62195
...Abstract Abstract A simple screening technique of hydrogen embrittlement (HE) of steels for hydrogen energy facilities using an in-situ small-punch (SP) test method under external hydrogen condition has been established. Using this method, we investigated the HE behaviors of API X70 steel welds...
Proceedings Papers

Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A050, July 13–15, 2021
Paper No: PVP2021-61821
...Abstract Abstract Blending hydrogen in the natural gas transmission and distribution systems is an option for hydrogen transportation. Integrity management of the existing infrastructure requires a risk evaluation for the planned hydrogen introduction and the challenge of hydrogen embrittlement...
Proceedings Papers

Proc. ASME. PVP2020, Volume 5: High Pressure Technology, V005T05A004, August 3, 2020
Paper No: PVP2020-21534
...Abstract Abstract Exposure of metallic parts to cathodic protection (CP) in sea water leads to production and diffusion of atomic Hydrogen into the metal matrix. Absorption of atomic Hydrogen into the metal could lead to hydrogen embrittlement (HE). In order to study the influence of stresses...
Proceedings Papers

Proc. ASME. PVP2020, Volume 5: High Pressure Technology, V005T05A008, August 3, 2020
Paper No: PVP2020-21478
...Abstract Abstract AISI 8630 steel used in subsea applications is subject to hydrogen embrittlement from externally applied cathodic protection. In this work, susceptibility variation on three grades of 8630 steel of different yield strength (YS), 100 ksi, 110 ksi and 120 ksi, were evaluated...
Proceedings Papers

Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A083, August 3, 2020
Paper No: PVP2020-21021
...Abstract Abstract It has been reported that hydrogen accumulation along grain boundaries (GBs) is an important process in the hydrogen embrittlement (HE) in pure Ni. However, there are no quantitative studies that elucidate the behavior of hydrogen accumulation and its effect on HE...
Proceedings Papers

Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A084, August 3, 2020
Paper No: PVP2020-21122
... and succeeded in predicting the FCG acceleration ratio observed on H1150. This model was also successfully applied to a low-alloy steel with a comparable UTS (1002 MPa) tested in gaseous hydrogen. hydrogen embrittlement precipitation hardened stainless steels fatigue life test fatigue crack growth...
Proceedings Papers

Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A085, August 3, 2020
Paper No: PVP2020-21228
... on flow stress. In addition, the L485-MB pipeline steel presents a shear type fracture mode in high partial pressure of hydrogen, whereas a cup and cone type fracture were observed in air, NG and low partial pressure of hydrogen in NG (0.2 MPa H 2 ). hydrogen embrittlement low alloy steel H 2 -NG...
Proceedings Papers

Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A105, August 3, 2020
Paper No: PVP2020-21524
... 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...
Proceedings Papers

Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A087, August 3, 2020
Paper No: PVP2020-21241
...Abstract Abstract Recently, a simple screening technique based on the quantitative evaluation of the hydrogen embrittlement (HE) sensitivity of the metallic materials using an in-situ small-punch (SP) test method was developed by the author group. The in-situ SP test can be easily carried out...
Proceedings Papers

Proc. ASME. PVP2019, Volume 1: Codes and Standards, V001T01A042, July 14–19, 2019
Paper No: PVP2019-93447
... stress-intensity range of an actual pressure vessel. type 2 pressure vessel leak before break high-pressure hydrogen vessel hydrogen embrittlement cyclic test ASSESSMENT OF LEAK BEFORE BREAK OF A NEWLY DEVELOPED TYPE II PRESSURE VESSEL WITH HIGH-PRESSURE HYDROGEN GAS Hiroshi Okano JFE Steel...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A037, July 14–19, 2019
Paper No: PVP2019-93145
... corrosion cracking or hydrogen embrittlement conditions. This work focuses on the problem of environmentally assisted cracking by using the Point Method and the Line Method, both of them belonging to the Theory of Critical Distances. Fracture mechanic tests were carried out, using a slow strain rate machine...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A050, July 14–19, 2019
Paper No: PVP2019-93550
... Abstract In this work, the incremental step loading technique to measure hydrogen embrittlement threshold in steels from ASTM F1624 standard is applied to the Small Punch test technique. For the experimental program, a medium strength steel is employed, simulating the hydrogen embrittlement...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A027, July 14–19, 2019
Paper No: PVP2019-93260
... Abstract Hydrogen barrier coating is a promising technology for preventing hydrogen embrittlement in metals. In this study, characterizations of hydrogen barrier films coated on surfaces of austenitic stainless steel, SUS304 of the Japanese Industrial Standard (JIS), by wet coating processes...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A028, July 14–19, 2019
Paper No: PVP2019-93395
... mechanism between the hydrogen charged specimens tested in air and the non-charged specimens tested in 100 MPa hydrogen gas seems to be different. Therefore, further investigations are required to clear this difference. hydrogen embrittlement SSRT test fatigue life test austenitic stainless steels...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A034, July 14–19, 2019
Paper No: PVP2019-93738
... Abstract In this study, a simple screening technique using an in-situ small-punch (SP) test and based on the hydrogen embrittlement (HE) sensitivity of austenitic stainless steels was developed for use in hydrogen energy facilities. To investigate the HE behaviors of metallic materials...
Proceedings Papers

Proc. ASME. PVP2019, Volume 6B: Materials and Fabrication, V06BT06A030, July 14–19, 2019
Paper No: PVP2019-93477
... suggested two possibilities: (I) interaction between hydrogen-moving dislocation is more important in the HE process of the Cu-Ni alloy compared to the pure Ni; (II) hydrogen transportation towards grain boundaries are required to cause the IG fracture in the Cu-Ni alloy. hydrogen embrittlement...
Proceedings Papers

Proc. ASME. PVP2009, Volume 6: Materials and Fabrication, Parts A and B, 1159-1166, July 26–30, 2009
Paper No: PVP2009-77038
... is beneficial to blunting crack tips and reducing crack propagation, high hydrostatic test pressures approaching yield cause localized threshold strains in weldments and base materials that consequently increases the susceptibility to nascent hydrogen embrittlement at strain boundaries. This paper discusses...