Presented by: De Carlo Livio
Supervisor: Scheubel Maud
Section: EN/MME-MM
Type:
Hostaphan RNK 2600 Hostaphan RNK 2600
From:
Sefar
Sefar
Date:
September 2010
December 2010
Samples: 6
2 (S1=#89 & S2=#89_2)

Hostaphan RNK 2600
JINR
January 2011
2 (R1=#047 & R2=#002)
Observations with stereomicroscope
○ Both sides (coated and chemically treated)
and cross section

Observations with optical microscope
○ Polished cross section

Tensile tests
○ 10*31 mm
Stereomicroscope observations
Type 3
6 samples from Sefar September
Type 2
Type 1
4 samples presented a weld like:
2 samples from Sefar December
2 samples presented a weld like:
Length: 0,8 to 0,9 mm
Thickness: 55 to 60 μm
2 samples from JINR January
• Length: 0,9 mm
Thickness: 60 to 70 μm
• Critical section:
•
•
Length: 0,3 mm
• Thickness: 60 to 70 μm
• Extremities not correctly welded
- Thickness: 30 μm to 45 μm
- Length: 110 μm to 170 μm
Length:
Length:0,6
0,9mm
mm Thickness
Thickness:
5064
to μm
90 μm
Tensile tests
6 samples from Sefar September
2 samples from Sefar December and
2 samples from JINR January
S2
S1
R2
R1
1bis
1
3
2
4
5
Tensile test results
6 samples from Sefar September
Hostaphan RNK 2600 welded
and treated (36 µm)
Sample 1
Sample 1bis
Sample 2
Sample 3
Sample 4
Sample 5
Type
Type 1
Type 1
Type 2
Type 2
Type 1
Type 1
Tensile
strength (MPa)
120,7
127,2
109,6
112,4
107,2
105.4
2 samples from Sefar December and 2 samples from JINR January
Hostaphan RNK 2600 welded and
treated (36 µm)
Type
Tensile strength (MPa)
Sample S1
Sample S2
Sample R1
Sample R2
Type 3
Type 3
Type 3
Type 3
127,5
127,6
124,2
132,6
Stereomicroscope observations after tensile test
6 samples from Sefar September
Type 1
Failure in the critical section
Type 2
Unsticking of the two extremities
Stereomicroscope observations after tensile test
2 samples from Sefar December
Type 3
S1: Failure in the weld
S2: Failure outside the weld but apparition of a crack
Elongation
2 samples from JINR January
Type 2
R1: Failure outside the weld
R2: Failure outside the weld but apparition of a crack
Elongation
Optical microscope observations
6 samples from Sefar September
Melted area not visible
2 samples from Sefar December
2 samples from JINR January
Optical microscope observations
Melted area measurements
S
E
F
A
R
2
Samples
Bef. t.t (%)
Aft t.t (%)
Sefar 1
42,6
36,7
Sefar 2
52,4
47,4
Dubna 1
49,0
49,0
Dubna 2
33,3
30,6
Optical microscope observations
Length measurements
S
E
F
A
R
1
D
U
B
N
A
2
Samples
Sefar 1
Bef. t.t
(μm)
870
Aft t.t
(μm)
970
Elongation
(µm)
100
Sefar 2
860
910
50
Dubna 1
850
860
10
Dubna 2
550
600
50
Optical microscope observations
Thickness measurements
D
U
B
N
A
1
Sefar 1: Failure in the weld
Comment: No a significant reduction of thickness in the weld, failure happens suddenly
Sefar 2: No failure but apparition of an
elongation
Comment:
Slight reduction but not significant
JINR 1: No failure and no elongation in the
weld
Comment:
The reduction of section is more visible
JINR 2: No failure but apparition of an
elongation
Comment:
No significant reduction
Optical microscope observation
Width outside the weld measurements
D
U
B
N
A
1
Thickness (µm)
Point 1
Point 2
Point 3
Point 4
Section 1
36
37
37
37
Section 2
36
36
Section 3
36
37
Section 4
36
Section 5
36
36
Section 6
36
Comment:
Thickness of 36 to 37 µm => No measurable reduction lower than 1 µm
Conclusions





Improvement in weld formation by Sefar
(September to December) and JINR
JINR weld has the same behavior at the
failure than Sefar December
1 / 2 of weld Sefar December resist to the
tensile test
2 / 2 of weld JINR resist to the tensile test
All results should be confirm by next
observations
Next step

Observations of four samples from Sefar
December 2010/ Sefar January 2011/
JINR to be delivered
Optical analyze
Optical analyze
Tensile test
4X
Sections comparison
Tensile test results:
6 samples from Sefar September
Hostaphan
RNK 2600
welded and
treated (36
µm)
Sample 1
Type
Tensile
strength
(MPa)
Elongation
at rupture
(%)
Type 1
120,67
7,66
Sample 1bis
Type 1
127,19
8,96
Sample 2
Type 2
109,54
/
Sample 3
Type 2
112,36
/
Sample 4
Type 1
107,19
3,89
Sample 5
Type 1
105.37
2,99
Hostaphan RNK 2600
no welded and
without deposit (36
µm)
Tensile strength(MPa)
260-280
Elongation at rupture
25-40 %
2 samples from Sefar December and 2 samples from Dubna January
Hostaphan RNK 2600
welded and treated (36
µm)
Tensile
strength
(MPa)
Elongation at rupture (%)
Sample S1
Sample S2
Sample R1
Sample R2
127,49
127,57
124,21
132,61
12,35
10,65
5,1
9,48