Growth of small fatigue cracks in PH 13-8 Mo stainless steel
Journal Article
·
· Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
- Georgia Inst. of Tech., Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering
The growth of small fatigue cracks in PH 13-8 Mo (H1050) stainless steel under constant amplitude loading at different mean stresses (R = 0.1 and {minus}1) under generally high cycle fatigue conditions was investigated. Small cracks were allowed to initiate naturally at the root of a single edge notch specimen and were monitored using a surface replicating technique. It was found that the initiation and growth of surface cracks up to 100 {micro}m encompassed 70 to 90 pct of the total fatigue life at stress amplitudes just above the fatigue limit. Cracks of length less than 100 {micro}m were subject to strong influences of the microstructure and exhibited stage 1 (shear-dominated) growth, which was manifested in oscillatory crack growth rates. The oscillations diminished as the crack transitioned to stage 2 growth. The higher stress ratio (R = 0.1) resulted in a more rapid transition from stage 1 to stage 2 growth in comparison to R = {minus}1. After transitioning to stage 2, the crack growth could be well characterized by conventional long crack tools even when the crack was still physically small. The small crack growth behavior is shown to be similar to that of a quenched and tempered AISI 4340 steel having a comparable strength.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 363988
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 5 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the transition of fatigue crack growth from stage 1 to stage 2 in a corrosive environment
Role of crack tip shielding in the initiation and growth of long and small fatigue cracks in composite microstructures
Impact of long term exposure on corrosion fatigue crack growth of low alloy steels
Journal Article
·
Wed Jan 31 23:00:00 EST 1996
· Metallurgical Transactions, A
·
OSTI ID:207698
Role of crack tip shielding in the initiation and growth of long and small fatigue cracks in composite microstructures
Journal Article
·
Tue Sep 01 00:00:00 EDT 1987
· Metall. Trans., A; (United States)
·
OSTI ID:6485636
Impact of long term exposure on corrosion fatigue crack growth of low alloy steels
Book
·
Sat Nov 30 23:00:00 EST 1996
·
OSTI ID:397835