Sinterizazio-atmosferaren eragina M graduko (ASP 30 ... - Euskara

90
o GT42
80
o
e
GT42C
VT42
* VT42C
70
60
x
o
*
A
o
Y
GT15
GT15C
VT15
VT15C
GPX30
GPX30C
4
Y
e
A
0
W
N
H
Cl]
z
H
50
40
30
x
*
VPX30
VPX30C
*
4
3
A
t
x
o
x
O
20 4 O
+ O X _y p
4
e
U
0
10
o
x
- g
1-1-~
-60 -40 -20 0 20 40 60 80
Y -l - v FIGURE 1 .- Variation of the
V
grain size with the deviation
from the optimum temperature
100 for different sintering
atmospheres.
DEVIATION OF SINTERING TEMPERATURE ( C)
FIGURE 2 .- Microstructures fo HSS T15 at optimun densification conditions :
(a) vacuum sintering and (b) gas atmosphere sintering
20 um
20 um
FIGURE 3.- SEM micrographs of the effect of atmosphere on the nature of primary particles at the
optimun sintering temperature on T15 steel: (a) vacuum sintering and (b) gas atmosphere sintering
Chemical analyses of dispersed particles have shown that the use of the gas mixture during
sintering, instead of vacuum (both in samples with and without carbon addition) produces
differences in chemical composition of MX type particles, while the chemical composition of
M6C type particles remains similar in all cases .