Quantitative analysis of microstructural effects on fatigue crack growth in widmanstätten Ti-6A1-4V and Ti-8Al-1Mo-1V

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

doi:10.1016/0013-7944(79)90138-3

Cited by 135 publications

(54 citation statements)

References 18 publications

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“…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%

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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

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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.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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

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“…As the growth-rate curves (in terms of AKth or 6KT) are traversed from left to right, values of Z exhibit no consistent trend, nor do those of ays" When the functional dependence of AK T on uy s and 1 is examined for all 15 of the materials of uy s and Z appear highly random. For the sake of completeness, data from our own work with titanium alloys [4,27] have been included in these and subsequent plots, denoted by the symbol "X". All other data symbols in these figures are identified in Table I.…”

Section: J1mentioning

confidence: 99%

“…8 to respective values of the cyclic plastic zone size from Eq. 4 Thus the broad spectrum of near-threshold growth-rate curves for the For example, inasmuch as there is as yet no ASTM standard for the relatively difficult measurement of growth rates in the near-threshold region, the data represented in Fig. I were obtained by a multitude of different procedures.…”

Section: J1mentioning

confidence: 99%

“…Recently, however, from our own extensive studies with a/3 titanium alloys, the basis for microstructural dependence of widely different fatigue crack growth rates was established for titanium alloys [2][3][4][5][6]. Inasmuch as the micromechanistic model from that work does not depend uniquely on alloy family, it is of great interest to explore its applicability to steels -especially since it predicts quantitatively the influence of yield strength and grain size in the near-threshold reqion for steels.…”

Section: Introductionmentioning

confidence: 99%

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A Critical Analysis of Grain-Size and Yield-Strength Dependence of Near-Threshold Fatigue Crack Growth in Steels

Yoder

Cooley

Crooker

1983

Fracture Mechanics: Fourteenth Symposium—Volume I: Theory and Analysis

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Near-threshold fatigue crack growth behavior has been analyzed for a broad selection of steels surveyed from the literature. It is clear first of all that apparent values of the threshold stress-intensity factor (ΔKth) can vary widely, roughly an order of magnitude. Though in many instances actual ΔKth values are difficult to define rigorously, a pronounced transition point or “knee” is apparent in the near-threshold region of the conventional logarithmic plot of fatigue crack growth rate (da/dN) as a function of stress-intensity range (ΔK). Though the values of ΔK associated with these transition points (ΔKT) for an individual steel may tend to exhibit a functional dependence on yield strength (σys) or grain size (¯ℓ)—as is the case, for example, with a low-carbon ferritic steel—it is unmistakably clear that for the gamut of steels examined (15 cases), the transition points do not order on the basis of either σys or ¯ℓ alone. Rather, values of ΔKT for the gamut of steels order on the basis of a synergetic interaction of σys and ¯ℓ, according to the equation, ΔKT=5.5σysℓ¯. This relationship was derived in the cyclic plastic zone model of fatigue crack growth established in our prior work with titanium alloys. In further agreement with this model, ΔKT has been identified for these steels as the point at which the cyclic plastic zone attains the mean grain size. The significance and implications of these findings appear far-reaching, as the steels surveyed include those of both high and low strength, a wide range of effective grain sizes (mean free path in the case of high-strength steel), and a host of microstructural types (ferritic, martensitic, pearlitic, bainitic, and austenitic).

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Investigating and Understanding the Fatigue Response and Failure of Built‐Up Welded Beams of a Titanium Alloy

Patnaik

Poondla

Bathini

et al. 2010

Fatigue of Materials

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Quantitative analysis of microstructural effects on fatigue crack growth in widmanstätten Ti-6A1-4V and Ti-8Al-1Mo-1V

Cited by 135 publications

References 18 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

A Critical Analysis of Grain-Size and Yield-Strength Dependence of Near-Threshold Fatigue Crack Growth in Steels

Investigating and Understanding the Fatigue Response and Failure of Built‐Up Welded Beams of a Titanium Alloy

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