Hot isostatic pressing of a near α-Ti alloy: Temperature optimization, microstructural evolution and mechanical performance evaluation

2020 ◽  
pp. 140426 ◽  
Author(s):  
Chao Cai ◽  
Xiangyun Gao ◽  
Qing Teng ◽  
Raj Kiran ◽  
Jie Liu ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Microstructural Evolution ◽  
Mechanical Performance ◽  
Hot Isostatic Pressing ◽  
Ti Alloy ◽  
Isostatic Pressing ◽  
Temperature Optimization

Microstructural Changes of a Creep-Damaged Nickel-Based K002 Superalloy Containing Hf Element under Different HIP Temperatures

2016 ◽  
Vol 35 (2) ◽  
pp. 153-159 ◽  
Author(s):  
Xiaomeng Wang ◽  
Yu Zhou ◽  
Jian Dong ◽  
Tianyou Wang ◽  
Zihua Zhao ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Temperature Increase ◽  
Volume Fraction ◽  
Hot Isostatic Pressing ◽  
Nucleation And Growth ◽  
Dissolution Process ◽  
Microstructural Changes ◽  
Isostatic Pressing ◽  
Solute Atoms

AbstractEffects of hot isostatic pressing (HIP) temperature on the microstructural evolution of a nickel-based K002 superalloy containing Hf element after long-term service were investigated using three different soaking temperatures during HIP. The degraded γ′ precipitates represented coarse and irregular morphology after long-term service. These γ′ precipitates still were of coarse and irregular shape, but the size and volume fraction of γ′ precipitates were markedly reduced under HIP condition of 1,190°C/200 MPa/4 h, indicating that the γ′ precipitates were experiencing a dissolution process. Meanwhile, the concentrically oriented N-type γ′ rafting structure around the cavities was formed. With HIP temperature increase to 1,220°C and 1,250°C, the small-sized, cubic and regular γ′ precipitates were re-precipitated, and the concentrically oriented γ′ structure vanished. The unstable morphology induced by the nucleation and growth of γ matrix was found near the creep cavities, indicating that the solute atoms diffused inward the creep-induced cavities during HIP. However, at HIP temperature of 1,220°C and 1,250°C, a large number of blocky MC(2)-type carbides containing amounts of Hf elements were precipitated, demonstrating that HIP treatment at higher temperatures can result in the formation of a large number of blocky MC(2)-type carbides.

scholarly journals Cold Isostatic Pressing to Improve the Mechanical Performance of Additively Manufactured Metallic Components

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2495 ◽  
Author(s):  
Isidoro Iván Cuesta ◽  
Emilio Martínez-Pañeda ◽  
Andrés Díaz ◽  
Jesús Manuel Alegre
Keyword(s):  
Mechanical Response ◽  
Mechanical Performance ◽  
Hot Isostatic Pressing ◽  
Processing Technique ◽  
Cold Isostatic Pressing ◽  
Small Samples ◽  
Homogeneous Distribution ◽  
Post Processing ◽  
Isostatic Pressing ◽  
Punch Test

Additive manufacturing is becoming a technique with great prospects for the production of components with new designs or shapes that are difficult to obtain by conventional manufacturing methods. One of the most promising techniques for printing metallic components is binder jetting, due to its time efficiency and its ability to generate complex parts. In this process, a liquid binding agent is selectively deposited to adhere the powder particles of the printing material. Once the metallic piece is generated, it undergoes a subsequent process of curing and sintering to increase its density (hot isostatic pressing). In this work, we propose subjecting the manufactured component to an additional post-processing treatment involving the application of a high hydrostatic pressure (5000 bar) at room temperature. This post-processing technique, so-called cold isostatic pressing (CIP), is shown to increase the yield load and the maximum carrying capacity of an additively manufactured AISI 316L stainless steel. The mechanical properties, with and without CIP processing, are estimated by means of the small punch test, a suitable experimental technique to assess the mechanical response of small samples. In addition, we investigate the porosity and microstructure of the material according to the orientations of layer deposition during the manufacturing process. Our observations reveal a homogeneous distribution independent of these orientations, evidencing thus an isotropic behaviour of the material.

Effect of powder surface state on microstructure and tensile properties of a novel near α-Ti alloy using hot isostatic pressing

2017 ◽  
Vol 706 ◽  
pp. 57-63 ◽  
Author(s):  
Ruipeng Guo ◽  
Lei Xu ◽  
Zhiyong Chen ◽  
Qingjiang Wang ◽  
Bernie Y. Zong ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Surface State ◽  
Hot Isostatic Pressing ◽  
Ti Alloy ◽  
Powder Surface ◽  
Isostatic Pressing

scholarly journals Effects of Postprocess Hot Isostatic Pressing Treatments on the Mechanical Performance of EBM Fabricated TI-6Al-2Sn-4Zr-2Mo

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2604 ◽  
Author(s):  
Miguel Lopez ◽  
Christina Pickett ◽  
Edel Arrieta ◽  
Lawrence E. Murr ◽  
Ryan B. Wicker ◽  
...  
Keyword(s):  
Grain Growth ◽  
Electron Emission ◽  
Mechanical Performance ◽  
Hot Isostatic Pressing ◽  
Alpha Phase ◽  
Grain Structure ◽  
Isostatic Pressing ◽  
Post Process ◽  
Equiaxed Grain ◽  
Thermionic Electron Emission

An essentially fully acicular alpha-prime martensite within an equiaxed grain structure was produced in an Electron Beam Melting (EBM)-fabricated Ti-6Al-2Sn-4Zr-2Mo (Ti6242) alloy using two different Arcam EBM machines: An A2X system employing tungsten filament thermionic electron emission, and a Q20 system employing LaB6 thermionic electron emission. Post-process Hot Isostatic Pressing (HIP) treatment for 2 h at 850, 950, and 1050 °C resulted in grain refinement and equiaxed grain growth along with alpha-prime martensite decomposition to form an intragranular mixture of acicular martensite and alpha at 850 °C, and acicular alpha phase at 950 and 150 °C, often exhibiting a Widmanstätten (basketweave) structure. The corresponding tensile yield stress and ultimate tensile strength (UTS) associated with the grain growth and acicular alpha evolution decreased from ~1 and ~1.1 GPa, respectively, for the as-fabricated Ti6242 alloy to ~0.8 and 0.9 GPa, respectively, for HIP at 1050 °C. The optimum elongation of ~15–16% occurred for HIP at 850 °C; for both EBM systems. Because of the interactive role played by equiaxed grain growth and the intragrain, acicular alpha microstructures, the hardness varied only by ~7% between 41 and 38 HRC.

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