Effects of Porosity and Re-HIP on Properties of Ti-6Al-4V Alloy from Atomized Powder

2014 ◽  
Vol 552 ◽  
pp. 274-277 ◽  
Author(s):  
Rui Peng Guo ◽  
Lei Xu ◽  
Jia Feng Lei ◽  
Rui Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Relative Density ◽  
Hot Isostatic Pressing ◽  
Effective Technique ◽  
Isostatic Pressing ◽  
Porosity Defects

Ti-6Al-4V alloys of various densities were prepared by powder metallurgy (PM) using hot isostatic pressing (HIPing). The effects of porosity on mechanical properties of PM compacts have been investigated. It indicated that PM Ti-6Al-4V alloy exhibited a better performance by increase of relative density, especially for the tensile strength at 400 oC. Re-HIPing was used to assess the possibility for increasing the relative density of PM compacts with porosity defects in the first HIPing cycles. The results show that re-HIPing is an effective technique to heal porosity defects. The relative density of PM compacts with porosity can be significantly improved by re-HIPing.

scholarly journals Evolution of Microstructure and Elements Distribution of Powder Metallurgy Borated Stainless Steel during Hot Isostatic Pressing

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Yanbin Pei ◽  
Xuanhui Qu ◽  
Qilu Ge ◽  
Tiejun Wang
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Powder Metallurgy ◽  
Relative Density ◽  
Hot Isostatic Pressing ◽  
Elemental Distribution ◽  
Isostatic Pressing ◽  
Average Grain Size ◽  
Borated Stainless Steel

prepared by powder metallurgy process incorporating atomization and hot isostatic pressing (HIP) sintering at six different temperatures from 600 to 1160 °C, borated stainless steel (BSS) containing boron content of 1.86 wt% was studied. The phase of BSS, relative density of different temperature, microstructure, elemental distribution, and mechanical properties were tested and analyzed. The phases of the alloy were calculated by the Thermo-Calc (2021a, Thermo-Calc Software, Solna, Sweden) and studied by quantitative X-ray diffraction phase analysis. The distributions of boron, chromium, and iron in grains of the alloy were analyzed by scanning electron microscopy and transmission electron microscope. The grain size distributions and average grain sizes were calculated for the boron-containing phases at 900, 1000, 1100, and 1160 °C, as well as the average grain size of the austenite phase at 700 and 1160 °C. After undergoing HIP sintering at 900, 1000, 1100, and 1160 °C, respectively, the tensile strength and ductility of the alloy were tested, and the fracture surfaces were analyzed. It was found that the alloy consisted of two phases (austenite and boron-containing phase) when HIP sintering temperature was higher than 900 °C, and the relative density of the prepared alloys was higher than 99% when HIP temperature was higher than 1000 °C. According to the boron-containing phase grain size distribution and microstructure analysis, the boron-containing phase precipitated both inside the austenite matrix and at the grain boundaries and its growth mechanism was divided into four steps. The tensile strength and elongation of alloy were up to 776 MPa and 19% respectively when the HIP sintering was at 1000 °C.

Fabrication and mechanical properties of powder metallurgy tantalum prepared by hot isostatic pressing

2015 ◽  
Vol 48 ◽  
pp. 211-216 ◽  
Author(s):  
Youngmoo Kim ◽  
Eun-Pyo Kim ◽  
Joon-Woong Noh ◽  
Sung Ho Lee ◽  
Young-Sam Kwon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Hot Isostatic Pressing ◽  
Isostatic Pressing

A Novel Forming Process for Powder Metallurgy of Superalloys

2014 ◽  
Vol 622-623 ◽  
pp. 833-839 ◽  
Author(s):  
Qian Bai ◽  
Jian Guo Lin ◽  
Gao Feng Tian ◽  
Daniel S. Balint ◽  
Jin Wen Zou
Keyword(s):  
Powder Metallurgy ◽  
Relative Density ◽  
High Performance ◽  
Low Cost ◽  
Hot Isostatic Pressing ◽  
Hot Extrusion ◽  
Forming Process ◽  
Isostatic Pressing ◽  
Wide Range ◽  
Forming Temperature

Powder metallurgy (PM) of nickel-based superalloys has been used for a wide range of products owing to their excellent special properties in processing and applications. Typical processes for high performance PM superalloys include hot isostatic pressing, hot extrusion and hot isothermal forging. Hot isostatic pressing is normally conducted at a high temperature, by using a low pressure for a long time in a closed vessel, resulting in high cost and low product efficiency. In this paper a novel forming process, i.e. direct powder forging for powder metallurgy of superalloys has been proposed. In this process, the encapsulated and vacuumed powder is heated up to the forming temperature and forged directly to the final shape, by using a high forming load for a very short time. Direct powder forging is a low-cost and energy-saving process compared to conventional PM processes, and in addition, press machines of conventional forging can be used for direct powder forming process. In direct powder forging it is important to control the relative density of the deformed part since the existence of voids could reduce the mechanical strength and fatigue life. In this paper, feasibility tests of direct powder forging are presented. Microstructure, relative density and hardness of the formed specimen were studied.

Effect of Hot Isostatic Pressing on Microstructures and Mechanical Properties of IN738LC Superalloy

2017 ◽  
Vol 898 ◽  
pp. 401-406
Author(s):  
Qun Gong He ◽  
Jun Liu ◽  
Lin Xu Li ◽  
Zhen Huan Gao ◽  
Xiao Yan Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Toughness ◽  
Rupture Life ◽  
Hot Isostatic Pressing ◽  
Stress Rupture ◽  
Stress Rupture Life ◽  
Isostatic Pressing ◽  
Microstructures And Mechanical Properties ◽  
The Impact

The microstructures and mechanical properties of IN738LC superalloy made by investment castings followed by Hot Isostatic Pressing (HIP) treatment have been investigated. The results revealed that after HIP treatment, the microporosities have been almost removed and the density rose by 0.21%. The eutectic size became smaller and the fraction decreased. The γ' phase was more regular and also increased in size, while a large number of secondary γ' phase appeared. With HIP treatment, the impact toughness increased from 5.0J ~ 7.0J to 8J ~ 9J and tensile strength at 200°C ~ 800°C was improved by approximately 3.2%~19.7%. In addition, the ductility and the stress rupture life have also been greatly improved as well.

In Situ Fabrication of Particles Reinforced Al-Si-Al2O3 Composites by Hot Isostatic Pressing

2011 ◽  
Vol 284-286 ◽  
pp. 38-42 ◽  
Author(s):  
Ying Gao ◽  
Dei Gui Zhu ◽  
Ling Cheng ◽  
Hong Liang Sun ◽  
Qing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Hot Isostatic Pressing ◽  
Reaction Sintering ◽  
Test Results ◽  
Isostatic Pressing ◽  
In Situ Reaction ◽  
Heating Up ◽  
Sintering Processes

Particles reinforced Al-xwt.%Si-Al2O3(x=10,20) composites are fabricated through in situ reaction sintering of Al and SiO2powder by hot isostatic pressing. Outgassing process and the microstructure of composites under different sintering processes are studied.XRD analysis confirms that the best hot outgassing temperature is 500°C,in situ reaction achieves completely and samples A2 and B2 have better microstructure at 550°C then heating-up to 700°C only for 1h.The microstructure analysis indicates that the reinforcement particulates distribute uniformly in the aluminum matrix.The mechanical properties test results show that the tensile strength of A2 is higher than B2. whenx=10,the Al-Si-Al2O3composites have better performance.

scholarly journals Structure, Texture and Tensile Properties of Ti6Al4V Produced by Selective Laser Melting

2019 ◽  
Vol 25 (25) ◽  
pp. 60-65
Author(s):  
Radomila Konečná ◽  
Denisa Medvecká ◽  
Gianni Nicoletto
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Tensile Properties ◽  
Selective Laser Melting ◽  
Hot Isostatic Pressing ◽  
Ti6al4v Alloy ◽  
Laser Melting ◽  
Isostatic Pressing ◽  
Material Defects

Abstract Additive manufacturing has recently expanded its potential with the development of selective laser melting (SLM) of metallic powders. This study investigates the relation between the mechanical properties and the microstructure of Ti6Al4V alloy produced by SLM followed by a hot isostatic pressing (HIP) treatment. HIP treatment minimizes the detrimental influence of material defects. Tensile specimens produced with reference to specific building axes were prepared using a Renishaw A250 system. It has been found that the tensile strength and elongation depend on specimen building direction. Microstructural and textural characterizations were carried out to identify the source of differences.

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