SCC path in forged aermet 100 steel

Lee, E. U.

doi:10.1007/bf02670628

Cited by 12 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, many steel components must have protective coating to prevent corrosion-related damage and premature failure, raising the initial investment and the subsequent life-cycle costs. In order to understand the metallurgical, mechanical, and corrosion characteristics of current and newly emerged steels, to clarify their capability and limitation, and to explore the possibilities of their property improvement, the Airframe Alloy Team of Aerospace Materials Division, Patuxent River has been studying several steels (references [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Some key results of those studies are compiled into this report.…”

Section: Nawcadpax/tr-2009/12mentioning

confidence: 99%

Aircraft Steels

Lee¹,

Taylor²,

Lei³

et al. 2009

Self Cite

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

show abstract

Section: Nawcadpax/tr-2009/12mentioning

confidence: 99%

Aircraft Steels

Lee¹,

Taylor²,

Lei³

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…Till now, experimental investigation on ultrahigh strength steel has been basically limited to the exploration of increasing strength and there have been few reports on the breakthrough in the combined optimization of strength and toughness [1][2][3]. Moreover, a fundamental understanding of some critical microstructural features and the problem of the stability of reverted austenite, A R , in the steel has still not been arrived at [1].…”

Section: Introductionmentioning

confidence: 99%

Combining strength and toughness in ultrahigh strength steel

Wang

Jiang

Zhu

et al. 2004

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The main objective of this investigation is to examine the effects of a new technique, double-ageing, on the microstructure and mechanical properties of the ultrahigh strength steel Aermet 100. Under the condition of double-ageing, there is no apparent decrease in the steel strength. However, the impact fatigue life can be prolonged by 35.5% and the dynamic fracture toughness raised by 22.6% by this technique compared with normal ageing. Based on the observation of the microscopic structure, the physical mechanism of prolongation of fatigue life and enhancement of the stability of the reverted austenite is analysed further. The results show that this new technique is a breakthrough in optimally combining the strength and toughness of Aermet 100 steel. In light of the current understanding of this subject, the toughness of the reverted austenite formed at the time of heat preservation at the higher temperature of the double-ageing process increases drastically. Moreover, during the treatment at the lower temperature of the double-ageing process, the carbon separating from the martensitic ferrite of Aermet 100 steel will diffuse into the reverted austenite, resulting in a decrease of the brittleness of the martensite and an increase of the stability of the reverted austenite.

show abstract

Internal hydrogen embrittlement of ultrahigh-strength AERMET 100 steel

Thomas

Scully

Gangloff

2003

Metall Mater Trans A

143

110

View full text Add to dashboard Cite

Near-peak-aged AERMET 100 is susceptible to severe internal hydrogen embrittlement (IHE) at 23 ЊC, if a sufficient diffusible hydrogen content is present, compromising the high toughness of this ultrahigh-strength steel (UHSS). Evidence includes the threshold stress intensity for subcritical IHE (K TH ) as low as 10 pct of the plane-strain fracture toughness (K IC ) and a fracture-mode transition from microvoid coalescence to brittle transgranular (TG) cracking, apparently along martensite lath interfaces and cleavage planes. The K TH value decreases from a K IC value of 132 to 143 MPaΊm to 12 MPaΊm, and the amount of brittle TG fracture increases to nearly 100 pct as the concentration of diffusible H increases from essentially 0 to 8 wppm, with severe embrittlement in the 0 to 2 wppm H regime. The IHE is time dependent, as evidenced by increasing K TH values with increasing dK/dt and K-independent subcritical crack growth rates, and is attributed to diffusional H repartition from reversible trap sites to the stressed crack tip. The partition distance is ϳ1 m, consistent with the fine-scale microstructure of AERMET 100. The causes of the susceptibility of AERMET 100 to TG IHE are very high crack-tip stresses and a reservoir of mobile H trapped reversibly at (Fe,Cr,Mo) 2 C precipitates. These factors enable repartition of H to misoriented martensite lath interfaces and interstitial sites near cleavage planes, with each prone to decohesion along a connected path. Predissolved H also reduces the ductile fracture toughness of AERMET 100 at high loading rates, perhaps due to reduced void growth caused by H trapped strongly at undissolved metal carbides.

show abstract

SCC path in forged aermet 100 steel

Cited by 12 publications

References 10 publications

Aircraft Steels

Aircraft Steels

Combining strength and toughness in ultrahigh strength steel

Internal hydrogen embrittlement of ultrahigh-strength AERMET 100 steel

Contact Info

Product

Resources

About