Detection and Deformation Mechanism of Non-Metallic Inclusions in FGH96 Alloy Isothermal Forging Disk

2013 ◽  
Vol 747-748 ◽  
pp. 526-534 ◽  
Author(s):  
Xiao Feng Wang ◽  
Xiao Ming Zhou ◽  
Jie Yang ◽  
Jin Wen Zou ◽  
Wu Xiang Wang
Keyword(s):  
Powder Metallurgy ◽  
Nondestructive Testing ◽  
Reaction Zone ◽  
Deformation Mechanism ◽  
Extrusion Process ◽  
Isothermal Forging ◽  
Remarkable Effect ◽  
Metallic Inclusions ◽  
Mechanical Bonding

According to the defects of powder metallurgy superalloy, especially the influence and damage of inclusions on properties of disk, the deviation between nondestructive testing and metallographic testing of inclusions in FGH96 alloy isothermal forging disk was investigated. Meanwhile, the types and deformation mechanism of inclusions were studied. The results showed that the buried depth tested by metallographic detection was less 67-180μm than nondestructive testing. The size of inclusions with metallographic detection was less about 18-50μm than nondestructive testing. The major types of inclusions in practical disk were Al2O3 and Al2O3-SiO2, the inclusions run through several grains, no matter Al2O3 or Al2O3-SiO2. The Al2O3 inclusion and matrix was purely mechanical bonding, but the Al2O3-SiO2 had reaction zone. There was remarkable effect of extrusion process on crushing and dispersing Al2O3 inclusion, but which was unremarkable for Al2O3-SiO2.

Deformation Behaviors of Non-Metallic Inclusion in FGH96 Superalloy during Different Plastic Processes

2012 ◽  
Vol 538-541 ◽  
pp. 1187-1191
Author(s):  
Min Cong Zhang ◽  
Chen Yi Liu ◽  
Shu Yun Wang
Keyword(s):  
Transition Zone ◽  
Extrusion Direction ◽  
Extrusion Process ◽  
Extrusion Ratio ◽  
Metallic Inclusion ◽  
Isothermal Forging ◽  
Forging Process ◽  
Discontinuous Line ◽  
Metallic Inclusions ◽  
Deformation Behaviors

The non-metallic inclusions in FGH96 superalloy during different plastic processes were studied. The results show that SiO2 react with aluminum and titanium in FGH96 superalloy and the reaction zone is formed in the interface between SiO2 and alloy, whereas Al2O3 react with no elements in FGH96 superalloy and the transition zone between them is mechanical combination during the plastic processes. In addition the sizes of non-metallic inclusions increase in the direction perpendicular to deformation during isothermal forging process. The non-metallic inclusions are pulled into a discontinuous line in extrusion direction and areas of non-metallic inclusions in each direction are constricted during extrusion process. The non-metallic inclusions of FGH96 superalloy is conditioned by the state of the as-extrusion inclusions during extrusion+isothermal forging process. In summary, extrusion process with large extrusion ratio can break the non-metallic inclusions in FGH96 alloy effectively and improve forging quality.

Structure Evolving at Bonding Interface of Dual-Alloys Jointed with Different Method under Coupling Action of Heat and Force

2013 ◽  
Vol 668 ◽  
pp. 543-546 ◽  
Author(s):  
Ze Kun Yao ◽  
Chun Qin ◽  
Yong Quan Ning ◽  
Jing Xia Chao ◽  
Jian Wei Zhang ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Bonding Interface ◽  
Solidification Structure ◽  
Isothermal Forging ◽  
Bonding Structure ◽  
Metallurgical Bonding ◽  
Linear Friction ◽  
Columnar Grains ◽  
Friction Weld ◽  
Mechanical Bonding

During near isothermal forging and heat treatment structure change of bonding interface in Ti3Al/TC11 and Ti2AlNb/TC11 dual alloys jointed with different method has been investigated. The results show that the solidification structure at dual-alloy joint welded by electron beam in vacuum has evolved into forging structure, columnar grains have been changed into equiaxed grains through breaking, crystal lattatice rebuild and re-crystallizing, and the mechanical bonding plus metallurgical bonding structure at joint welded by linear friction weld has transformed into metallurgy structure altogether, because constant high temperature during near isothermal forging can cause the diffusion of alloy elements and reconstruction of lattice structure.

scholarly journals CNTs/TiC Reinforced Titanium Matrix Nanocomposites via Powder Metallurgy and Its Microstructural and Mechanical Properties

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hisashi Imai ◽  
Junko Umeda ◽  
Bunshi Fugetsu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Multiwall Carbon Nanotubes ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Dispersion Strengthening ◽  
Titanium Matrix ◽  
Wet Process ◽  
Plasma Sintering

By using pure titanium powder coated with unbundled multiwall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with the CNTs was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.

scholarly journals Improved properties of Al–Si3N4 nanocomposites fabricated through a microwave sintering and hot extrusion process

RSC Advances ◽  
2017 ◽  
Vol 7 (55) ◽  
pp. 34401-34410 ◽  
Author(s):  
Penchal Reddy Matli ◽  
Fareeha Ubaid ◽  
Rana Abdul Shakoor ◽  
Gururaj Parande ◽  
Vyasaraj Manakari ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Microwave Sintering ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Powder Metallurgy Method

In this study, nano-sized Si3N4 (0, 0.5, 1.0 and 1.5 vol%)/Al composites were fabricated using a powder metallurgy method involving microwave sintering technique followed by hot extrusion.

Superplastic deformation mechanism in powder metallurgy magnesium alloys and composites

2001 ◽  
Vol 49 (11) ◽  
pp. 2027-2037 ◽  
Author(s):  
H. Watanabe ◽  
T. Mukai ◽  
M. Mabuchi ◽  
K. Higashi
Keyword(s):  
Powder Metallurgy ◽  
Magnesium Alloys ◽  
Deformation Mechanism ◽  
Superplastic Deformation

Microstructural and Mechanical Properties of Titanium Matrix Composites Reinforced with Nano Carbon Materials via Powder Metallurgy Process

2009 ◽  
Vol 618-619 ◽  
pp. 495-499 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Junko Umeda ◽  
Hisashi Imai ◽  
Bunshi Fugetsu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Matrix Composites ◽  
Dispersion Strengthening ◽  
Titanium Matrix ◽  
Wet Process ◽  
Plasma Sintering

Powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with multi-wall carbon nanotube (MWCNT) was prepared by spark plasma sintering (SPS) and hot extrusion process, where the powder surface was coated by un-bundled CNTs via wet process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in-situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyser. The mechanical properties of TMC were significantly improved by adding a small amount of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of specimens were analysed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.

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