Fatigue crack growth rates of X100 steel welds in high pressure hydrogen gas considering residual stress effects

Ronevich, Joseph Allen; D'Elia, Christopher R.; Hill, Michael R.

doi:10.1016/j.engfracmech.2018.02.030

Fatigue crack growth rates of X100 steel welds in high pressure hydrogen gas considering residual stress effects

Journal Article · Tue Mar 06 00:00:00 EST 2018 · Engineering Fracture Mechanics

DOI:https://doi.org/10.1016/j.engfracmech.2018.02.030· OSTI ID:1765776

Ronevich, Joseph Allen ^[1]; D'Elia, Christopher R. ^[2]; Hill, Michael R. ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of California, Davis, CA (United States)

Fatigue crack growth rate (FCGR) data were measured in high pressure hydrogen gas versus stress intensity factor range (ΔK) in specimens removed from a X100 welded steel pipe. Three distinct regions of the pipe weld were examined: base metal, weld fusion zone, and heat affected zone. Tests were performed at a load ratio (R) of 0.5, frequency of 1 Hz, and at a hydrogen gas pressure of 21 MPa. Tests were also performed in air at 10 Hz as a reference. Fatigue crack growth rates were observed to be over an order of magnitude higher for tests performed in hydrogen compared to the rates from tests in air. Residual stress measurements were collected on identical specimens cut from the base metal, weld, and heat affected zone to account for their influence on measured FCGR data. The slitting method provided residual stress and residual stress intensity factor (K_res), the effect of which was removed from the FCGR data using K_norm in order to provide a more direct comparison of crack growth resistance of the base metal, weld and heat affected zone. Prior to accounting for residual stress, FCGR in hydrogen gas appeared to be highest in the weld fusion zone. Furthermore, after accounting for residual stress effects, the weld fusion zone FCGR data converged to the base metal FCGR data, which underscores the importance of accounting for residual stress effects when assessing fatigue performance.

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Program

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1765776

Report Number(s):: SAND--2021-0745J; 693567

Journal Information:: Engineering Fracture Mechanics, Journal Name: Engineering Fracture Mechanics Vol. 194; ISSN 0013-7944

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

42 ENGINEERING
Fatigue crack growth rate
High pressure hydrogen
High strength pipeline steels
Hydrogen embrittlement
Residual stress

Fatigue crack growth rates of X100 steel welds in high pressure hydrogen gas considering residual stress effects

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References (10)

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