hot explosive pressing of high strength and superhard materials by r. prümmer, germany and k....
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Hot Explosive Pressing of High Strength and Superhard Materials by R. Prümmer, Germany and K. Hokamoto, Japan. EPNM-2008 May 5-9, 2008. Lisse. Why Hot Expl. Pressing?. HEP Udimet 700 Ni-base Superalloy. Composition of several Nickel based Superalloys. Atomization of Udimet 700 - Powder. - PowerPoint PPT PresentationTRANSCRIPT
Hot Explosive Pressingof High Strength and Superhard Materials
by
R. Prümmer, Germanyand
K. Hokamoto, Japan
EPNM-2008May 5-9, 2008. Lisse
Why Hot Expl. Pressing?HIP
Hot Isost.PressCEP
Cold Expl.PressHEP
Hot Expl. Press.
Pressure limited unlimited unlimited
Duration long shortseveral microsec.
shortseveral microsec.
Diffusion high limited high
Plasticdeformation low medium high
Melting,leadingto welding no locally very high
3
4
HEPUdimet 700
Ni-base Superalloy
5Composition of several Nickel based Superalloys
6Atomization of Udimet 700 - Powder
7
8 Density of Sample after HEP of Udimet 700- Powder
9Hardness of Samples vs. Temperature of HEP
1010
Micrograph of Sample showing surface melting
1113Strength of Sample vs. Temperature of HEP
12
HEPDiamond Powder, 4-8 um grain size
13Principle of Set-up for HEP
14
Set-up for HEP
15
Sample Set -up
High pressure due to mach stem and end plug
16
Sample, longitudinally cut open
17
Micrograph of polished Surface of Diamond Compact
18
Scanning Electron Micrograph of Fracture Surface
19X-ray Diffraction Pattern of Diamond Powder and Compactas delivered: black, after heat treatment: blue; compacted: red
As-received
1100 C
Compact
o
20
0 2 4 6 8
10
8
6
4
2 (a) As-received(b) 1100oC
(c) Compact
cos
/.10
7(m
-1)
sin/.1010 (m-1)
0 2 4 6 8
10
8
6
4
2 (a) As-received(b) 1100oC
(c) Compact
cos
/.10
7(m
-1)
sin/.1010 (m-1)
Hall-Williamson Plot of Diamond Powder and Compact
sin(/) ・ 1010 (m-1)
si
n(/
) ・1
07 (m
-1)
Slope;Lattice strain
ConclusionsThe effects of the use of hot explosive pressing are demonstrated at the present investigation for Udimet 700 and diamond powders.Surface melting and softening the powders improves the condition of compaction, and the compacts recovered show improved mechanical properties and the crystalline lattice strain.
21