Influence of surface quality and porosity on fatigue behaviour of Ti–6Al–4V components processed by MIM

Ferri, Orley Milagres; Ebel, Thomas; Bormann, R.

doi:10.1016/j.msea.2009.11.007

Cited by 66 publications

(42 citation statements)

References 14 publications

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“…The crack nucleation seems to take place below the surface of the samples due to this. Comparing the results with previous investigations [7], the fatigue life of shot peened MIM Ti6Al-4V specimens can be up to 10 7 cycles under a stress amplitude of 450MPa when the oxygen content is 0.19 wt.%. In case of MIM Ti-6Al-7Nb samples, fatigue resistance is lower (375MPa) having an oxygen content of 0.25wt.%.…”

Section: Powder Metallurgy Of Titanium IIsupporting

confidence: 69%

“…Fatigue samples were subjected to shot peening using zirconia particles with a diameter of 200 µm to improve the surface quality of specimens providing appropriate conditions for fatigue tests [7]. High cycle fatigue tests were…”

Section: Methodsmentioning

confidence: 99%

“…However, fatigue properties of MIM components remain unclear. Ferri et al [7] studied the fatigue behaviour of MIM Ti-6Al-4V alloy. It was found that working with oxygen levels below the tensile critical value, parameters such as surface quality and microstructure are more decisive than the interstitial content.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Oxygen on the Fatigue Behaviour of Ti-6Al-7Nb Alloy

Hidalgo

Ebel

Limberg

et al. 2016

KEM

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Abstract.One of the challenges in PM Ti alloys is to control the impurities level. Oxygen affects the microstructure and the mechanical properties of titanium alloys. Ti-6Al-7Nb is a promising alloy to use in PM due to its outstanding biocompatibility and mechanical properties required for load bearing medical implants. In this work, the influence of the impurities content on the ductility, fatigue resistance and microstructure of Ti-6Al-7Nb alloy processed by metal injection moulding was examined. Tensile and fatigue specimens were manufactured using Ti-6Al-7Nb gas atomized powder. Depending on the thermal treatment time, various oxygen contents were introduced into the specimens. The resulting oxygen content was determined by melt extraction technique. Tensile tests and high cycle four-point bending fatigue tests at room temperature were performed. First studies about the effect of oxygen content on crack initiation and propagation were done by the observation of microstructures and fractured surfaces using light and electron microscopy (SEM).

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Section: Powder Metallurgy Of Titanium IIsupporting

confidence: 69%

Section: Methodsmentioning

confidence: 99%

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Influence of Oxygen on the Fatigue Behaviour of Ti-6Al-7Nb Alloy

Hidalgo

Ebel

Limberg

et al. 2016

KEM

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“…In addition, post-processing may be needed to improve the density for specific applications. For instance, where fatigue resistance is important, a shot peening process has been shown to reduce the surface porosity which improved the fatigue strength by 100MPa [44,45]. Hot isostatic pressing (HIP) is a common process used to improve the density and mechanical properties of MIM and other powder metallurgy components.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Metal injection moulding of titanium and titanium alloys: Challenges and recent development

et al. 2017

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“…In addition, it is possible to manufacture metal parts with higher mechanical properties than that of the press sintered material because of high density using fine powder. Injection molded Ti-6Al-4V alloy compacts have been studied extensively for applications of MIM process (Noda et al, 2011)(Ferri et al, 2009)(Ferri et al, 2010 . Generally, injection molded Ti-6Al-4V compacts show sufficient static mechanical properties (tensile strength and ductility) comparable to that of the wrought material.…”

mentioning

confidence: 99%

Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts

Kudo

Shinagawa

Miura

2018

Mechanical Engineering Journal

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IntroductionThe titanium alloys have superior advantages such as high specific strength, high corrosion resistance and heat resistance. They are used in medical, aerospace and other fields (Niinomi, 2001). However, their poor workability involves the high cost by removal processing. According to the powder metallurgy, titanium alloy parts can be produced in the near net shape, which is effective in reducing the processing cost.Among many types of powder metallurgy, metal injection molding (MIM) process is an advantageous technique for the production of complex shaped parts. In addition, it is possible to manufacture metal parts with higher mechanical properties than that of the press sintered material because of high density using fine powder. Injection molded Ti-6Al-4V alloy compacts have been studied extensively for applications of MIM process (Noda et al., 2011)(Ferri et al., 2009)(Ferri et al., 2010 . Generally, injection molded Ti-6Al-4V compacts show sufficient static mechanical properties (tensile strength and ductility) comparable to that of the wrought material. The fatigue strength, however, is significantly lower than that of wrought material. One of the reasons for low endurance is the existence of residual pores, but the principal factor is the coarse lamellar microstructure in normal sintered compacts. The microstructures of the wrought material and the MIM sintered compacts are shown in Fig.1, respectively. The equiaxed fine microstructure of the wrought material is produced by hot plastic working in the α + β temperature region, which brings about high strength-elongation balance (Matthew and Donachie, 1988) and high fatigue strength. On the other hand, so-called lamellar microstructure, in which α phase is precipitated in a layered manner in β phase, was observed in Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts ， Kentaro KUDO* Kazunari SHINAGAWA** and Hideshi MIURA*** AbstractInjection molded Ti-6Al-4V compacts have normally a coarse lamellar microstructure, because it is sintered above the  transus temperature and it is cooled slowly in furnace. However, static mechanical properties such as tensile strength and ductility are equivalent to those of wrought materials, but they have the disadvantage that the fatigue strength is significantly lower than wrought materials. Therefore, improvement of fatigue strength is needed for injection molded Ti alloy compacts. In this study, injection molded Ti-6Al-4V compacts having equiaxed microstructure were prepared by sintering at α + β region temperature which is very lower than normal sintering temperature. When sintering is carried out in α + β region, sinterability is remarkably poor. Therefore, long-time sintering is required. Since the grain growth of the prior β grains was suppressed by the pinning effect of α grains and pores, it was possible to obtain the significantly fine grains as compared with the β region sintered compacts. The α + β region sintered compacts showed high strength, high e...

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Influence of surface quality and porosity on fatigue behaviour of Ti–6Al–4V components processed by MIM

Cited by 66 publications

References 14 publications

Influence of Oxygen on the Fatigue Behaviour of Ti-6Al-7Nb Alloy

Influence of Oxygen on the Fatigue Behaviour of Ti-6Al-7Nb Alloy

Metal injection moulding of titanium and titanium alloys: Challenges and recent development

Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts

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