The influence of a duplex microstructure in steels on fatigue crack growth in the near-threshold region

Minakawa, K.; Matsuo, Y.; McEvily, A.J.

doi:10.1007/bf02643352

Cited by 98 publications

(36 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As is characteristic with duplex microstructures (14,15,(20)(21)(22)(23)(24), crack extension was not confined to either one of the two phases. However, crack paths were distinctly more tortuous in the Fe/2Si/0.1C steel, suggesting that the superior near-threshold fatigue resistance was again a consequence of enhanced roughness-induced closure.…”

Section: Introductionmentioning

confidence: 85%

“…~uch results, which show the degree of closure to be at a maximum close to ~Ko' are consistent with several recent observations on the near-threshold crack closure effect (e.g., refs. 6,7,15,17,26,27). It is also clear that, at a given ~K, the extent of closure is far greater for the microstructures showing the highest thresholds at R = 0.05, i.e., closure is enhanced in the IA and SQ rather than in the IQ structures, with the KC1/Kmax ratios at ~Ko being between 0.7 to 0.8 in each case (Fig.…”

Section: Crack Closure Resultsmentioning

confidence: 99%

“…Based on similar tests in higher carbon steels, Minakawa et al (15) found.that such closure, and the resulting effects on ~Ko values, were far less pronounced with higher volume fractions of martensite.…”

Section: Introductionmentioning

confidence: 94%

“…Subsequent studies (IS) in AISI 1018 and 21Cr-1Mo steels confirmed the superior strength and long crack fatigue threshold properties of MEF, compared to conventionally heat-treated, microstructures and suggested that a high * degree of connectivity of the martensite and a large volume fraction of ferrite were important factors in duplex structures for achieving high thresholds with high st~ength. Such microstructures were reported to promote enhanced crack closure effects due to a more tortuous crack path, i.e., roughness-induced crack closure (6,(16)(17)(18)(19), and the high threshold values were correspondingly attributed to such closure (15).…”

Section: Introductionmentioning

confidence: 99%

“…McEvily and co-workers (14,15) who developed two different duplex microstructures in an AISI 1018 steel; one where a continuous ferrite matrix encapsulated islands of martensite (termed FEM or Type A in McEvily and co-workers' terminology (14,15}), and the other where a continuous martensitic phase encapsulated islands of ferrite (termed MEF or Type B).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fatigue crack propagation in dual-phase steels: Effects of ferritic-martensitic microstructures on crack path morphology

1984

View full text Add to dashboard Cite

LBL-16264Characteristics of fatigue crack propagation in dual-phase steels have been investigated in a high purity Fe-2Si-0.lC steel with the objective of developing ferritic-martensitic microstructures with maximum resistance to fatigue crack extension whilst maintaining high strength levels. A wide range of crack growth rates has been examined, from ~ 10-8 to 10-3 mm/cycle, in a series of duplex microstructures of comparable yield strength and prior austenite grain size where intercritical heat-treatments were used to vary the proportion, morphology and distribution of the ferrite and martensite phases. Results of fatigue crack propagation tests, conducted on "long cracks" in room temperature moist air environments, revealed a very large influence of microstructure over the entire spectrum of growth rates at low load ratios. Similar trends were observed at high load ratio, although the extent of the microstructural effects on crack growth behavior was V. B. DUTTA is Graduate Student Research

show abstract

Section: Introductionmentioning

confidence: 85%

Section: Crack Closure Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue crack propagation in dual-phase steels: Effects of ferritic-martensitic microstructures on crack path morphology

1984

View full text Add to dashboard Cite

show abstract

Fatigue crack growth in an as‐rolled dual‐phase steel

Chen¹,

Zhongguang

Jiang

et al. 1988

Steel Research

View full text Add to dashboard Cite

Fatigue crack propagation behaviour of an as-rolled dual-phase steel is investigated over a wide range from 10-10 to 10-6 m/ cycle in a 3.5% NaCI solution and laboratory air under different load ratios. It was found that the as-rolled dual-phase steel studied in the present investigation shows good resistance to fatigue crack growth in laboratory air. The threshold values decrease with increasing stress ratios, which is consistent with the competition model proposed previously. The threshold value obtained using a 3.5% NaCI solution is higher than that in the laboratory air owing to the wedge effect of corrosion products within the crack. Fatigue crack growth rates in the higher 11K range obey the Paris formula in each case within this study.ErmiidungsriBwachstum in Dualphasenstahl im Walzzustand. Es wurde das Ausbreitungsverhalten von Errnudunqsrissen an einem Dualphasenstahl im Walzzustand untersucht. Die groBe Bandbreite der Untersuchungen umfaBte 10-10 bis 10-£ m/Zyklus in einer 3,5%igen NaCI-Lbsung und Laborluft bei unterschiedlichen l.astverhaltnissen. Es wurde festgestellt, daB der in dieser Arbeit untersuchte Dualphasenstahl im Walzzustand ein gutes Widerstandsverhalten qeqenuber der Bildung von Errnudunqsrissen in Laborluft hat. Mit zunehmenden Spannunqsverhaltnissen vermindern sich die Grenzwerte, was mit dem fruher schon vorgestellten Vergleichsmodell ubereinstlrnmt. Der erreichte Grenzwert, unter Verwendung von 3,5%iger NaCI-Lbsung, ist hbher als der unter Laborluft erreichte, bedingt durch den Keileffekt der Korrosionsprodukte innerhalb des Risses. Die Wachstumsraten von Ermudunqsrissen in einem hbheren 11K-Bereich entsprechen in dieser Arbeit in jedem Fall der Paris-Forme!.

show abstract

Optimal Bainite Contents for Maximizing Fatigue Cracking Resistance of Bainite/Martensite Dual‐Phase EA4T Steels

Chen

Zhang

Zeng

et al. 2018

steel research int.

View full text Add to dashboard Cite

Fatigue crack propagation behavior of bainite/martensite dual‐phase EA4T steels with four different volume fractions of bainite ranging from 21% to 70% is investigated. The results indicate that the bainite/martensite dual‐phase steel specimens with the volume fraction of bainite of 49–60% have the higher resistance to fatigue crack growth than the others. The coupled contributions of plasticity‐induced crack closure and crack deflection to the higher fatigue crack growth resistance is estimated. A model related to the plastic zone size and the roughness of the fracture surface is proposed to evaluate the optimal volume fraction of bainite in the dual‐phase steels.

show abstract

The influence of a duplex microstructure in steels on fatigue crack growth in the near-threshold region

Cited by 98 publications

References 16 publications

Fatigue crack propagation in dual-phase steels: Effects of ferritic-martensitic microstructures on crack path morphology

Fatigue crack propagation in dual-phase steels: Effects of ferritic-martensitic microstructures on crack path morphology

Fatigue crack growth in an as‐rolled dual‐phase steel

Optimal Bainite Contents for Maximizing Fatigue Cracking Resistance of Bainite/Martensite Dual‐Phase EA4T Steels

Contact Info

Product

Resources

About