Fatigue Property Enhancement of .ALPHA.-.BETA. Titanium Alloys by Blended Elemental P/M Approach.

Hagiwara, Masatoshi; Kaieda, Yoshinari; Kawabe, Yoshikuni; Miura, Shin

doi:10.2355/isijinternational.31.922

Cited by 44 publications

(27 citation statements)

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“…9,10) It seems reasonable that the fatigue crack in the present B-free and B-modified alloys with lamellar micro- structures would be initiated by the same mechanism as reported by Hagiwara. Namely, the fatigue crack was initiated from the shear fracture across a colony.…”

Section: Mechanism Of Hcf Improvementmentioning

confidence: 65%

High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy

Hagiwara

Kitaura

Ono³

et al. 2012

Mater. Trans.

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Ti6Al4V alloys modified with minor amounts of boron (B) were prepared, and two types of microstructures, a full lamellar microstructure and an equiaxed microstructure, were generated through combinations of hot-deformation and heat treatments. The beneficial effect of adding a minor amount of B in refining microstructures was confirmed in as-cast ingots and a full lamellar microstructure. For example, a refined prior ¢ grain size of about 100 µm in diameter was obtained for the 0.1 mass percent B-modified alloy with a full lamellar microstructure: accordingly, the size of each colony within the grains was reduced. Contrary to this, equiaxed microstructures with ¡ grain sizes of about 8 µm were obtained for both B-free and B-modified alloys. The room temperature high cycle fatigue (HCF) strength of the B-modified alloys increased compared to the B-free alloy for both microstructures. For example, HCF strength at 10 7 cycles for the alloy with an equiaxed microstructure increased to 750 MPa by the addition of 0.1% B from 650 MPa for B-free alloy. The fatigue crack was found to originate neither from the TiB/matrix interface nor from the TiB itself but rather from the shear fractures across microstructural units such as colonies or spherical ¡ phases. The reduced colony size and the retarding effect of TiB against the movement of the fatigue initiation area were thought to be responsible for the improved HCF properties of Ti6Al4V with lamellar and equiaxed microstructures, respectively.

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Section: Mechanism Of Hcf Improvementmentioning

confidence: 65%

High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy

Hagiwara

Kitaura

Ono³

et al. 2012

Mater. Trans.

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“…Comparing the results with commercial Ti-6Al-4V alloys produced by powder metallurgy, 13) the Ti-0.5B-0.5N cast alloy obtained in this study has almost the same mechanical properties.…”

Section: Mechanical Propertiesmentioning

confidence: 54%

Microstructure and Mechanical Properties of Ti-B-N Cast Alloys Prepared by Reactive Arc-Melting

et al. 2002

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Ti-B-N cast alloys were prepared by a reactive arc-melting technique using elemental titanium and boron nitride powders. The alloys obtained were composites of titanium matrix containing nitrogen of 3 mol% or less and a small amount of TiB reinforcement. The microstructure of the matrix was a cellular structure consisting of elongated dislocation cells with 1-2 µm in width and 5-10 µm in length, for Ti-1B-1N alloy. The TiB particles were rod-like in shape with size of less than 0.5 µm in diameter and agglomerated to form clusters along the grain boundary. The mechanical properties were mainly dependent on the content of nitrogen and the influence of TiB on the mechanical properties was relatively small. The Ti-B-N cast alloys containing suitable concentration of nitrogen, Ti-0.5B-0.5N alloys, had a high strength of 920 MPa with adequate ductility of more than 5%.

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“…As seen in Figure 33, the lower-cycle fatigue strengths are improved when HIP is used to close porosity. However, the coarse lamellar microstructure in PM Ti-6Al-4V cannot be avoided in conventional BE sintering processes [313,360]. Thus, even if the porosity is eliminated by HIP or some other process, the coarse lamellar colonies initiate fatigue cracks with relative ease, leading to a generally poor high cycle fatigue strengths for BE Ti6Al-4V.…”

Section: Fatigue Propertiesmentioning

confidence: 99%

Powder metallurgy of titanium – past, present, and future

Fang

Paramore

Sun

et al. 2017

International Materials Reviews

389

158

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Powder metallurgy (PM) of titanium is a potentially cost-effective alternative to conventional wrought titanium. This article examines both traditional and emerging technologies, including the production of powder, and the sintering, microstructure, and mechanical properties of PM Ti. The production methods of powder are classified into two categories: (1) powder that is produced as the product of extractive metallurgy processes, and (2) powder that is made from Ti sponge, ingot, mill products, or scrap. A new hydrogen-assisted magnesium reduction (HAMR) process is also discussed. The mechanical properties of Ti-6Al-4V produced using various PM processes are analyzed based on their dependence on unique microstructural features, oxygen content, porosity, and grain size. In particular, the fatigue properties of PM Ti-6Al-4V are examined as functions of microstructure. A hydrogen-enabled approach for microstructural engineering that can be used to produce PM Ti with wroughtlike microstructure and properties is also presented.

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Fatigue Property Enhancement of .ALPHA.-.BETA. Titanium Alloys by Blended Elemental P/M Approach.

Cited by 44 publications

References 0 publications

High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy

High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy

Microstructure and Mechanical Properties of Ti-B-N Cast Alloys Prepared by Reactive Arc-Melting

Powder metallurgy of titanium – past, present, and future

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Fatigue Property Enhancement of .ALPHA.-.BETA. Titanium Alloys by Blended Elemental P/M Approach.

Cited by 44 publications

References 0 publications

High Cycle Fatigue Properties of a Minor Boron-Modified Ti&ndash;6Al&ndash;4V Alloy

High Cycle Fatigue Properties of a Minor Boron-Modified Ti&ndash;6Al&ndash;4V Alloy

Microstructure and Mechanical Properties of Ti-B-N Cast Alloys Prepared by Reactive Arc-Melting

Powder metallurgy of titanium – past, present, and future

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High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy

High Cycle Fatigue Properties of a Minor Boron-Modified Ti–6Al–4V Alloy