### Abstract

Subcritical crack growth in a quenched and tempered 4340 steel was studied as a function of hydrogen pressure, (P//H(2)), at 298 K. Under sustained load the threshold stress intensity for crack propagation was dependent on the hydrogen pressure in the pressure range tested, (20 torr less than equivalent to P//H(2) less than equivalent to 760 torr). Crack growth rates as a function of stress intensity, (K), exhibited a K-dependent region (stage I) and a K-independent region (stage II). In stage I the crack growth rate is proportional to P**n//H(2) where n greater than 1, and in stage II the crack growth rate is proportional to the first power of the pressure of the hydrogen gas, (n equals 1). The results are explained in terms of rate determining processes and a model explaining the kinetics of hydrogen enhanced slow crack growth is developed.

Original language | English (US) |
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Title of host publication | Unknown Host Publication Title |

Place of Publication | Blacksburg, Va |

Publisher | Lab for the Study of Environ Degradation of Eng Mater |

Pages | 523-532 |

Number of pages | 10 |

State | Published - 1977 |

Externally published | Yes |

Event | Environ Degradation of Eng Mater, Proc of Conf - Blackburg, VA, USA Duration: Oct 10 1977 → Oct 12 1977 |

### Other

Other | Environ Degradation of Eng Mater, Proc of Conf |
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City | Blackburg, VA, USA |

Period | 10/10/77 → 10/12/77 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Unknown Host Publication Title*(pp. 523-532). Blacksburg, Va: Lab for the Study of Environ Degradation of Eng Mater.

**HYDROGEN ENHANCED SLOW CRACK GROWTH IN 4340 STEEL.** / Sieradzki, Karl; Ficalora, P. J.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Unknown Host Publication Title.*Lab for the Study of Environ Degradation of Eng Mater, Blacksburg, Va, pp. 523-532, Environ Degradation of Eng Mater, Proc of Conf, Blackburg, VA, USA, 10/10/77.

}

TY - CHAP

T1 - HYDROGEN ENHANCED SLOW CRACK GROWTH IN 4340 STEEL.

AU - Sieradzki, Karl

AU - Ficalora, P. J.

PY - 1977

Y1 - 1977

N2 - Subcritical crack growth in a quenched and tempered 4340 steel was studied as a function of hydrogen pressure, (P//H(2)), at 298 K. Under sustained load the threshold stress intensity for crack propagation was dependent on the hydrogen pressure in the pressure range tested, (20 torr less than equivalent to P//H(2) less than equivalent to 760 torr). Crack growth rates as a function of stress intensity, (K), exhibited a K-dependent region (stage I) and a K-independent region (stage II). In stage I the crack growth rate is proportional to P**n//H(2) where n greater than 1, and in stage II the crack growth rate is proportional to the first power of the pressure of the hydrogen gas, (n equals 1). The results are explained in terms of rate determining processes and a model explaining the kinetics of hydrogen enhanced slow crack growth is developed.

AB - Subcritical crack growth in a quenched and tempered 4340 steel was studied as a function of hydrogen pressure, (P//H(2)), at 298 K. Under sustained load the threshold stress intensity for crack propagation was dependent on the hydrogen pressure in the pressure range tested, (20 torr less than equivalent to P//H(2) less than equivalent to 760 torr). Crack growth rates as a function of stress intensity, (K), exhibited a K-dependent region (stage I) and a K-independent region (stage II). In stage I the crack growth rate is proportional to P**n//H(2) where n greater than 1, and in stage II the crack growth rate is proportional to the first power of the pressure of the hydrogen gas, (n equals 1). The results are explained in terms of rate determining processes and a model explaining the kinetics of hydrogen enhanced slow crack growth is developed.

UR - http://www.scopus.com/inward/record.url?scp=0017682597&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0017682597&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:0017682597

SP - 523

EP - 532

BT - Unknown Host Publication Title

PB - Lab for the Study of Environ Degradation of Eng Mater

CY - Blacksburg, Va

ER -