Fatigue crack propagation resistance of beta-annealed Ti-6AI-4V alloys of differing interstitial oxygen contents

Yoder, G. R.; Cooley, L A; Crooker, T. W.

doi:10.1007/bf02661812

Cited by 80 publications

(21 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Increased colony size and consequently larger efective slip length leads to a more bifurcated crack growth proile and increased crack propagation resistance of the material. This result is consistent with the works of Yoder et al [41][42][43] and L(tjering and Williams [28].…”

Section: Discussionsupporting

confidence: 93%

“…A comprehensive study on the inluence of microstructural variables on near-threshold fatigue behaviour of macrocracks in titanium Ti-6Al-4V was conducted by Yoder et al [41][42][43]. Bilinear crack growth rate behaviour was observed, with two distinct branches that independently obey the power law and join together in the transition point ∆K T ).…”

Section: Discussionmentioning

confidence: 99%

“…The most inluential microstructural parameter on the mechanical properties of lamellar platelet) microstructures is the colony size packet size) because it determines the efective slip length in lamellar structures [28,41]. This parameter should be considered as the efective microstructural size for lamellar morphology in the FZ.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Fomin¹,

Ventzke²,

Dorn³

et al. 2017

Study of Grain Boundary Character

View full text Add to dashboard Cite

The efect of postweld heat treatment PWHT) on 2.6-mm-thick Ti-6Al-4V but joints that were welded using a continuous-wave 8-kW yterbium ibre laser was studied in terms of the microstructure, microtexture, number of welding defects, microhardness, residual stress distribution and high cycle fatigue HCF) properties. Five types of heat treatments in the temperature range of 540-920°C are investigated. The main reasons leading to fatigue life deterioration after the laser welding process are discussed, and possible guidelines for further improvement of the HCF behaviour by a subsequent suitable type of PWHT are provided. Low-temperature annealing T < 600°C) tends to harden both the base material and the welding zone without any signiicant efect on the fatigue properties. Heat treatments at higher temperatures T > 50°C) lead to the transformation of a strong martensitic structure in the fusion zone FZ) into more ductile coarse lamellar, which is more beneicial for fatigue performance. A suitable type of PWHT can increase the fatigue limit of a laser-welded Ti-6Al-4V but joint by 10%; however, a slight decrease in static strength should be considered. The efect of stress relief at elevated temperatures is studied.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Fomin¹,

Ventzke²,

Dorn³

et al. 2017

Study of Grain Boundary Character

View full text Add to dashboard Cite

show abstract

“…Yoder and coworkers [17][18][19] investigated the microstructural features o f the fracture surfaces in dependence on FCP-rates in Ti-alloys. They found that the microstructural features of the fracture surfaces and thc FCP-rates correlated with the cyclic plastic zone acting during the respective growth interval.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Abnormal da/dN – ΔK curves: New failure mode with Ti – alloys

Marci¹

1997

Materialwissenschaft Werkst

View full text Add to dashboard Cite

Fatigue crack propagation (FCP) -rates and -threshold values have been determined on the titanium alloys 1M1 834. IMI 685 (turbine disk materials) and Ti-6AIMV-2Sn (plate material). K,,;,,-constant tests were executed in laboratory air at room temperature and run with 50 Hz o n C(T) specimens. It was found that FCP-rates in K,,',,-constanl tests followed the well known FCP behavior up t o a certain limiting value K,,,,,, denoted as "K,l,i,x. Below "K,,,zl,. the FCP-rates da/dN decrease with decreasing AK down to the threshold value AKT (AK for 10 ' mmicycle). For K,,,,,-constant tests with K,,,,,, > "K,,~,,. the FCP-rates initially decreased with decreasing AK, but reached Ii)-' inmicycle at smal-were never reached as AK decreased to and below AK,. Instead. as AK approaches o r gets smaller than AK.,, the FCP-rates stay either constant o r increasc again. The limit value " K , , ,~~~ for this abnormal FCP-behavior had hccn determined for IMI 834 to be 22 to 28 M P a G ; ; , for IMI 685 to be 46 M P a G and for Ti-SAI-6V-2Sn to be 26 M P a G . The important result from a practical standpoint is the large difference in "K,,,;,, for comparable Ti alloys, i. e., IMI 834 and IMI 685.Abnormale da/dN -AK Kurven: Neue Versagensart bei Ti -Legierungen ErmudungsriBwachstuni und Ermudungsschwellwerte wurden a n Ti-Legierungen untersucht, insbesonders an den Turbinenscheibenmatcrialien IMI 834, IMI 6x5 und dem Plattenmaterial Ti-6AI-6V-2Sn. Die Versuchc wurden mil der K,,,;,,-konstant Methode in Laborluft bei Raumtempcratur und einer Frequenz von SO Hz an C(T)-Probcn durchgefuhrt. Es wurde gefunden, daR das ErmiidungsriR-wachstum im K,,,,,,-konstant Versuch bis zu einer Obergrenze ''KR,lix der bckannten GesetzrnW,igkeit folgt, nach der das Ernmudungsril.(wachstuni init stcigcndem AK ansteigt. Bei einem K,:,,-konstant Vcrsuch mil K,,,,,, 2 "K,,,,, > c'Kn,z,x verringert sich die Ermudungs-riMwachstumg~schwindigkcit zuerst mit abnehmendem AK, errcicht aber nicht mehr die niedrige Geschwindigkeit entsprechend dem Ermijdungsschwellwert AKT (AK bei lo-' mm /Lastwechsel). Nahert sich das kleiner werdende AK dem AKT, dann beginnt ein anderer RiBwachstumsmechanismus zu wirkcn und die RiRwachstumsgeschwindigkeit bleibt entweder etwa konstant odcr aber nimmt mit abnehmendem AK stetig zu. Die Grenzc ''K,,,lgx fur dicses abnormale RiBwachstumsverhalten wurde fur IMI 834 mil 22 bis 28 M P a G , fur IMI 685 mit 46 M P a G und fur das Plattenmaterial Ti-6A1-6V-2Sn mit 26 M P a G bestimmt. Die wichtige Erkenntnis aus praktischer Sicht ist der relative Iinterschied in "K,,,,, fur vergleichbare TiLegierungen wic IMI X34 und IMI 685.

show abstract

“…By attention to this fact that at the threshold region, fatigue cracks propagate in a non-continuum manner, increasing of threshold stress intensity factor could enhance the fatigue crack growth resistance. Yoder [12] showed that an enlargement in mean structural unit size increases the transition point of fatigue crack propagation ΔK T = 5:5σ y l À Á 1 = 2 . For ΔK ≤ ΔK T , a crystallographic fracture occurs that is responsible for lower propagation rate at regions beneath the transition point.…”

Section: Introductionmentioning

confidence: 99%

Effect of oxygen boost diffusion treatment on fatigue behavior of Ti–4Al–2V alloy

Omidbakhsh

Ebrahimi

Mousavi

et al. 2011

Surface and Coatings Technology

View full text Add to dashboard Cite

Fatigue crack propagation resistance of beta-annealed Ti-6AI-4V alloys of differing interstitial oxygen contents

Cited by 80 publications

References 19 publications

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Effect of Microstructure Transformations on Fatigue Properties of Laser Beam Welded Ti‐6Al‐4V Butt Joints Subjected to Postweld Heat Treatment

Abnormal da/dN – ΔK curves: New failure mode with Ti – alloys

Effect of oxygen boost diffusion treatment on fatigue behavior of Ti–4Al–2V alloy

Contact Info

Product

Resources

About