Effect of Hot Isostatic Pressing on the Microstructure of K417G Cast Turbine Discs

2015 ◽  
Vol 816 ◽  
pp. 557-561 ◽  
Author(s):  
Jie Li ◽  
Chao Yuan ◽  
Jian Ting Guo ◽  
Jie Shan Hou ◽  
Lan Zhang Zhou
Keyword(s):  
Interdendritic Region ◽  
Volume Fraction ◽  
Hot Isostatic Pressing ◽  
Dendritic Structure ◽  
Experimental Results ◽  
Dendrite Core ◽  
Slow Cooling ◽  
Isostatic Pressing

The present study focused on the effect of hot isostatic pressing (HIP) treatment on the microstructure of K417G superalloy. The experimental results showed that after the HIP treatment the size and volume fraction of the porosities significantly decreased. In addition, the dendritic structure and γ/γ' eutectics in the as-cast specimens became obscure after the HIP treatment due to the improvement of segregation. The γ′ phases in the dendrite core were smaller than those in the interdendritic region, whether in the as-cast or HIP specimens. The slow cooling at the end of the HIP treatment leads to the irregular morphology of the γ′ phases.

Effect of Hot Isostatic Pressing on the Microstructure of Single Crystal Ni-Based Superalloy DD10

2013 ◽  
Vol 747-748 ◽  
pp. 772-776
Author(s):  
Li Jun Liu ◽  
Ming Xue ◽  
Jing Yang Chen ◽  
La Mei Cao
Keyword(s):  
Electron Microscope ◽  
Single Crystal ◽  
Interdendritic Region ◽  
Hot Isostatic Pressing ◽  
Optical Microscope ◽  
Dendrite Core ◽  
Dendritic Segregation ◽  
Third Generation ◽  
Isostatic Pressing ◽  
Scanning Electron

The effects of hot isostatic pressing on the microstructures of a third generation single crystal Ni-based superalloy DD10 were investigated by using optical microscope (OM), scanning electron microscope (SEM), electron microprobe analyzer (EPMA). The results showed that the micropores in the interdendritic region were eliminated completely after hot isostatic pressing at 1320 and 150MPa. Meanwhile, the morphology of γ precipitates changed to be more cuboidal and the distribution of γ precipitates in both dendrite core and interdendritic region became more uniform after hot isostatic pressing. Hot isostatic pressing also promoted the homogenization of the composition between dendrite core and interdendritic region and the dendritic segregation of Re, W, Al and Ta was decreased.

scholarly journals Structural and mechanical characteristics of some lead-free Cu-Sn based solder alloys

2008 ◽  
Vol 62 (3) ◽  
pp. 160-163 ◽  
Author(s):  
Aleksandra Mitovski ◽  
Ljubisa Balanovic ◽  
Dragana Zivkovic ◽  
Sasa Marjanovic ◽  
Bata Marjanovic ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Dendritic Structure ◽  
Production Method ◽  
Experimental Results ◽  
Lead Free ◽  
Solder Alloys ◽  
Slow Cooling ◽  
Mechanical And Electrical Properties ◽  
Additional Thermal Treatment ◽  
Lead Free Solders

The results of structural and mechanical characteristics of lead-free Cu-Sn based solder alloys, produced in Company "11. mart" AD Srebrenica (Republic of Srpska), are presented in this paper. The results of investigation of samples - alloys CuSnl4, CuSnlFelAlO.5, CuSnlOFelAllMnO.5 and CuA110Fe3Mn produced by different processing methods, include the data obtained by optical microscopy and measurements of hardness, micro hardness and electroconductivity, in order to characterize mentioned alloys and define the influence of processing method applied on their structural and mechanical properties. Microstructural experimental results of samples produced by casting in a metal mould with fast water cooling showed clearly sharp dendritic structure. Samples obtained by casting in a sand mould, displayed structure with big crystals, higher amount of segregation and inclusions on the grain boundaries, as a result of the slow cooling process. Hardness and microhardness tests showed increasing values as the amount of tin raised. Sample 3 showed the lowest value, as a result of the crystallization process and lackness of additional thermal treatment. Experimental results of the electroconductivity test showed that mentioned sample has got the highest value, which can be also explained by its production method. Results presented in this paper can contribute to investigations of copper-tin lead-free alloys, having in mind that various potential lead-free solders still haven't been completely investigated from the aspects of their structural, mechanical and electrical properties.

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.

Effects of Co on the Solidification and Precipitation Behaviors of IN 718 Alloy

2015 ◽  
Vol 816 ◽  
pp. 613-619 ◽  
Author(s):  
Xin Xin ◽  
Wei Hong Zhang ◽  
Lian Xu Yu ◽  
Fang Liu ◽  
Dan Jia ◽  
...  
Keyword(s):  
Interdendritic Region ◽  
Mass Fraction ◽  
Volume Fraction ◽  
Laves Phase ◽  
Solidification Point ◽  
Dendrite Core ◽  
Residual Liquid ◽  
Gray Phase ◽  
Co Alloys

The effects of Co from 0 to 11.60 % (in mass fraction) on the solidification and precipitation behaviors of IN 718 alloy had been investigated. The results showed that the volume fraction of the dendrite core increased with the addition of Co. In the alloys with 0-5.84 %Co, the addition of Co could restrain the precipitation of blocky Laves phase and promoted the formation of eutectic Laves phase. In the alloys with 9.00-11.60 % Co, the eutectic gray phase and small blocky Laves phase precipitated in the interdendritic region. The eutectic gray phase increased and small blocky Laves phase decreased with increasing Co. The parallel lath-like δ-Ni3Nb phase was observed to precipitate in some interdendritic region without the formation of gray phase and Laves phase in the 9.00-11.60 % Co alloys. Further research found that Co slightly segregated in the dendrite core and markedly raised the solubility of element Mo in the dendrite core which resulted in reduced Mo in the residual liquid, and consequently, restrained Laves phase while promoted the precipitation of Mo-depleted gray phase and δ-Ni3Nb phase. Furthermore, Co was seemed to elevate the solidification point of the γ matrix while decrease that of the Laves phase.

scholarly journals Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing

2017 ◽  
Vol 62 (1) ◽  
pp. 253-258
Author(s):  
S. Roskosz
Keyword(s):  
Light Microscopy ◽  
Quantitative Evaluation ◽  
Volume Fraction ◽  
Turbine Blades ◽  
Hot Isostatic Pressing ◽  
Quantitative Metallography ◽  
Isostatic Pressing ◽  
Round Shape ◽  
Hip Process ◽  
Increased Pressure

Abstract The aim of this paper is an assessment of the influence of hot isostatic pressing treatment on porosity of cast samples - turbine blades and vane clusters made of the IN713C superalloy. Two variants of HIP treatments, differing in pressure from each other, have been used. The quantitative evaluation of the porosity was performed using light microscopy and quantitative metallography methods. The use of the hot isostatic pressing significantly decreased the volume fraction and size of pores in the test blades, the remaining pores after the HIP process being characterized by a round shape. The increased pressure has caused significant reductions in the area fraction and size of the pores.

scholarly journals On the Hot Isostatic Pressing of Inconel 625 Structures built using Laser Powder Bed Fusion at Higher Layer Thickness

2021 ◽  
Author(s):  
Saurav Kumar Nayak ◽  
Arackal Narayanan Jinoop ◽  
Christ Prakash Paul ◽  
Vesangi Anil Kumar ◽  
Dineshraj Subburaj ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Volume Fraction ◽  
Hot Isostatic Pressing ◽  
Microstructural Analysis ◽  
Inconel 625 ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Isostatic Pressing ◽  
Elemental Segregation

Abstract This paper reports the effect of Hot Isostatic Pressing (HIPing) on the porosity, microstructure and mechanical properties of Laser Powder Bed Fusion (LPBF) IN625 structures built at a higher layer thickness of 100 µm. It is observed that the process-induced pores/voids of volume fraction (Vf) 0.43% in as-built IN625 structures are reduced significantly to ~ 0.01% after HIPing treatment. The microstructure is changed from fine columnar dendrites to coarse equiaxed dendrites. The microstructural analysis of as-built structures reveals the presence of cellular/ dendritic growth along with elemental segregation of Nb, Si and C and precipitation of Nb-rich carbides. Whereas, coarse recrystallized microstructure along with elemental segregation of Si and precipitation of Nb, Mo and Cr rich carbides are observed in Hot Isostatic Pressed (HIPed) samples. HIPed structures exhibit lower tensile s trength, higher ductility, and lower anisotropy as compared to LPBF built structures. There is a reduction in the Vickers micro-hardness of IN625 samples after HIPing and the values are observed to be similar to their conventional counterparts. Further, an increase in the energy storage capacity of the material is observed after HIPing treatment through Automated Ball Indentation (ABI®) studies. The study paves a way to develop ~100% dense, defect-free and isotropic engineering components using LPBF.

A Review: Effect of Sintering Method on the Decomposition of Hydroxyapatite and Density of Hydroxyapatite Zirconia Composites

2013 ◽  
Vol 465-466 ◽  
pp. 843-846
Author(s):  
Chee Huan Leong ◽  
Andanastuti Muchtar ◽  
C.Y. Tan ◽  
Masfueh Razali
Keyword(s):  
Fracture Toughness ◽  
Mechanical Strength ◽  
Relative Density ◽  
Phase Stability ◽  
Biomedical Applications ◽  
Hot Isostatic Pressing ◽  
Experimental Results ◽  
Isostatic Pressing ◽  
Zirconia Composites ◽  
Sintering Method

Hydroxyapatite (HA) is a biomaterial with excellent biocompatibility. However, the brittleness and low fracture toughness of HA have limited its biomedical applications. As such, HA has been incorporated with zirconia (ZrO2) to enhance its mechanical strength. However, ZrO2 addition decreases the phase stability of HA. HA decomposition is not favored because it decreases the mechanical strength of HA/ZrO2. In this paper, the effect of sintering on HA decomposition is reviewed. Experimental results show that hot isostatic pressing of HA/ZrO2 is one of the most effective methods to suppress HA decomposition, yielding the highest relative density compared with other sintering methods.

The Effects of Hot Isostatic Pressing Conditions on the Microstructure of Beta-Gamma Titanium Aluminide Powder Alloys

2010 ◽  
Vol 89-91 ◽  
pp. 325-330
Author(s):  
D. Laurin ◽  
Dong Yi Seo ◽  
H. Saari ◽  
Young Won Kim
Keyword(s):  
Titanium Aluminide ◽  
Volume Fraction ◽  
Hot Isostatic Pressing ◽  
Beta Phase ◽  
Hot Workability ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium ◽  
Isostatic Pressing ◽  
Powder Alloys ◽  
Titanium Aluminide Alloys

The effects of hot isostatic pressing temperature and cooling rate on the microstructure of two powder metallurgy beta-gamma titanium aluminide alloys with nominal compositions TiAl 4Nb 3Mn (G1) and TiAl-2Nb-2Mo (G2) are investigated. Particular attention is placed on the volume fraction of the beta phase, which is known to improve the hot workability. The alloys are consolidated by hot isostatic pressing at 1200 °C, 1250 °C, and 1300 °C, and cooled at rates between 3.0 °C/min and 17.5 °C/min. The volume fraction of beta phase in both alloys was unaffected by the change in cooling rates. The volume fraction of the beta phase in G2 decreased linearly from ~9.5 vol.% to ~3.5 vol.% with increasing HIP temperature from 1200 °C to 1300 °C.

scholarly journals Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications

2021 ◽  
Author(s):  
Joan Lario Femenía ◽  
Angel Vicente Escuder ◽  
Vicente Amigó Borrás
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Hot Isostatic Pressing ◽  
Phase Changes ◽  
Post Processing ◽  
Slow Cooling ◽  
Isostatic Pressing ◽  
Porosity Reduction ◽  
Hip Process

The influence of the hot isostatic pressing (HIP) post-processing step on structural and phase changes, porosity healing and mechanical strength in a powder metallurgy Ti35Nb2Sn alloy was studied. Powders were pressed at room temperature at 750 MPa, and then sintered at 1,350°C in a vacuum for 3 h. The standard HIP process at 1,200°C and 150 MPa for 3 h was performed to study its effect on a Ti35Nb2Sn powder metallurgy alloy. The influence of the HIP process and cold rate on density, microstructure, the quantity of interstitial elements, mechanical strength and Young's modulus was investigated. HIP post-processing for 2 h at 1,200°C and 150 MPa led to greater porosity reduction and a marked retention of the β phase at room temperature. The slow cooling rate during the HIP process affected phase stability, with a large amount of α”-phase precipitate, which decreased the titanium alloy’s yield strength.

Sign in / Sign up

Export Citation Format

Share Document