Effect of Hot Isostatic Pressing Conditions and Cooling Rate on Microstructure and Properties of Ti–6Al–4V Alloy from Atomized Powder

Xu, Li; Guo, Rui; Bai, Chunguang; Lei, Jiafeng; Yang, Rui

doi:10.1016/j.jmst.2014.04.011

Cited by 87 publications

(49 citation statements)

References 16 publications

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“…Micro-CT was used to assess the porosity in PM Ti 2 AlNb specimens HIP'ed at different temperatures. Higher HIP'ing temperature is good for increasing the relative densities of powder compacts according to other studies [10] , while the average grain will become coarse with the HIP'ing temperature increase which would deteriorate properties. Contour map based on response surface methodology (RSM) was used to analyze the effect of HIP'ing temperature on the porosities size and distribution, as shown in Fig.…”

Section: Resultsmentioning

confidence: 72%

“…According to other researchers' study [6,10] , HIP'ing parameters (temperature, pressure and time), especially HIP'ing temperature has a significant effect on the porosity, microstructure and properties of PM alloys. In this study, four representative HIP'ing temperatures (930 o C, 980 o C, 1010 o C and 1030 o C) were selected based on DSC analysis.…”

Section: Resultsmentioning

confidence: 95%

“…The powders were in general spherical in shape and had a smooth surface, only a few had attached satellites. All powders had cellular microstructure indicating that there was no sufficient time for the transformation from the B2 to 2 or O phase during the rapid solidification except at the cell walls [10] . The size distribution of the pre-alloyed powders produced using argon gas and a typical set of parameters is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…HIP'ing Response of PM Ti-22Al-24Nb-0.5Mo Alloy Porosities were one of the most important issues for the application of PM titanium alloys. Porosities may come from the following sources, (1) the absorbed gas (H 2 O and O 2 ) on the powder surface during the powder storage, filling and transportation, (2) the entrapment of argon during powder argon atomization, (3) capsule failure during HIP'ing and (4) insufficient HIP'ing process [10] .…”

Section: Resultsmentioning

confidence: 99%

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Effect of Hot Isostatic Pressing and Heat Treatment on Microstructure and Mechanical Properties of Pm Ti‐22Al‐24Nb‐0.5Mo (At.%) Alloy

Wang

Lü

et al. 2016

Proceedings of the 13th World Conference on Titanium

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Ti-22Al-24Nb-0.5Mo (at.%) pre-alloyed powder was prepared by the electrode induction melting gas atomization (EIGA) process. Powder metallurgical (PM) alloy was prepared by hot isostatic pressing (HIP'ing). HIP'ing with different parameters and different post heat treatments were conducted to study their effects on microstructure and mechanical properties of the PM alloy. The microstructure was characterized by optical microscopy, scanning electron microscopy, X-ray Micro Computed Tomography (Micro-CT) and so on. Porosity distribution in the HIP'ed samples, directly influenced by HIP'ing temperature was related to their mechanical properties. The variation of the amount of different phases and the microstructure with post heat treatment was studied in detail, and a good combination of tensile strength, ductility and stress rupture life were obtained through an optimized heat treatment.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Hot Isostatic Pressing and Heat Treatment on Microstructure and Mechanical Properties of Pm Ti‐22Al‐24Nb‐0.5Mo (At.%) Alloy

Wang

Lü

et al. 2016

Proceedings of the 13th World Conference on Titanium

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“…Lei Xu [3] also investigated the effects of temperature and pressure on microstructure of powder compacts during HIP. Through the comparison of the samples HIPped at 800 ºC and 910 ºC, it was found that more stable and homogeneous microstructure can be obtained at higher temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of hot isostatic pressing temperature on casting shrinkage densification and microstructure of Ti6Al4V alloy

Zhou

et al. 2017

China Foundry

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T i6Al4V alloy has the properties of small density, high strength and good corrosion resistance. However, Ti6Al4V alloy castings are prone to shrinkage porosity due to its poor fluidity, leading to the poor performance of components. The defects must be reduced to a minimum level, especially in the field of aerospace and other high-quality-requirement industry. Hot isostatic pressing (HIP) has been proved to be a very effective way to eliminate or reduce shrinkage. A workpiece is heated and put under uniform pressure by inert gas, and the shrinkage is eliminated without changing the shape by the mechanism of plastic deformation, creep and diffusion bonding [1][2] . For decades, remarkable work has been done on the effect of HIP temperature on alloy's densification and microstructure. Gang Wang [2] et al. have studied the influence of HIP temperature on the microstructure of 2A12 powder compact. It was found that the microstructure Abstract:The Ti6Al4V alloy castings were produced by the investment casting process, and the hot isostatic pressing (HIP) was used to remove shrinkage from castings. The processing pressure and holding time for HIP were 150 MPa and 20 min, respectively. Four different HIP temperatures were tested, including 750 ºC, 850 ºC, 920 ºC and 950 ºC. To evaluate the effects of temperature on densification and microstructure of Ti6Al4V alloy treated by HIP, non-destructive testing and metallographic observation was performed. The experimental results show that the shrinkage was completely closed at 920 ºC and 950 ºC. The densification of Ti6Al4V alloy increased as the HIP temperature increased below 920 ºC. The lamellae were more uniform, the thickness of lamellae was obviously broadened and the structure was coarsen. Besides, the Norton creep equation was used to simulate the effect of different temperatures on the densification of Ti6Al4V alloy during HIP. The simulation results were in good agreement with the experimental results. It was also found that 920 ºC is a suitable temperature for HIP for Ti6Al4V alloy.Key words: Ti6Al4V alloy; hot isostatic pressing; temperature; casting shrinkage; densification; microstructure of raw powders changed from a dendrite structure to an equiaxed structure from room temperature to 600 ºC. Lei Xu [3] also investigated the effects of temperature and pressure on microstructure of powder compacts during HIP. Through the comparison of the samples HIPped at 800 ºC and 910 ºC, it was found that more stable and homogeneous microstructure can be obtained at higher temperature. Chung-Hung Tam [4] et al. have studied the effects of three different HIP temperatures 1,323 K, 1,373 K and 1,423 K on the densification of Cr-Si targets, and it was found 1,373 K was a suitable HIP temperature for the three Cr-Si targets. Yu Zhou [5] investigated the effects of HIP temperature on the densification of Nibased superalloy. It was found that HIP temperature played a dominant role in the cavity healing process. With gradually increasing HIP temperature, the cavity healing behavi...

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Identification of the Norton‐Green Compaction Model for the Prediction of the Ti–6Al–4V Densification During the Spark Plasma Sintering Process

et al. 2016

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One of the main challenges for the industrialization of the spark plasma sintering (SPS) is to resolve issues linked to the compaction of real parts with complex shapes. The modeling of powder compaction is an interesting tool to predict how the densification field varies during sintering. However, expressing the behavior law which reflect the powder compaction is often a difficult and long step in the model establishment. In this paper, a simple methodology for the identification of the densification parameters is proposed. Dense and porous creep tests combined with SPS die compaction tests are employed to determine a complete densification law on a Ti-6Al-4V alloy directly in a SPS machine. The compaction model obtained is successfully validated through prediction of the densification of new SPSed samples.

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Effect of Hot Isostatic Pressing Conditions and Cooling Rate on Microstructure and Properties of Ti–6Al–4V Alloy from Atomized Powder

Cited by 87 publications

References 16 publications

Effect of Hot Isostatic Pressing and Heat Treatment on Microstructure and Mechanical Properties of Pm Ti‐22Al‐24Nb‐0.5Mo (At.%) Alloy

Effect of Hot Isostatic Pressing and Heat Treatment on Microstructure and Mechanical Properties of Pm Ti‐22Al‐24Nb‐0.5Mo (At.%) Alloy

Effects of hot isostatic pressing temperature on casting shrinkage densification and microstructure of Ti6Al4V alloy

Identification of the Norton‐Green Compaction Model for the Prediction of the Ti–6Al–4V Densification During the Spark Plasma Sintering Process

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