Effect of preparatory thermal treatments on S32760 SDSSs...
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Shot Peening: ZrO 2 Ceramic beads (Ø=300 μm, 700 HV) Almen intensity: 10A Coverage: 100% ↑ Resistance to: Fatigue SSC Fretting Erosion 0 200 400 600 800 1000 1200 1400 1600 0 100 200 300 400 500 Temperature [°C] Soaking time [s/mm] Thermal Treatment CD A36 A72 A210 A360 S1300 S1400 Solubilization Temperature Recrystallization Steps γ 2 Precipitation 0,25 0,5 0,75 1 1,25 1,5 1,75 CD A36 A72 A210 A360 S1300 S1400 Partition Coefficient Chemical Distribution Cr Mo Ni Mn 220 230 240 250 260 270 280 290 300 310 320 CD A36 A72 A210 A360 S1300 S1400 HV100 Phases MicroHV Ferrite Austenite ENERGY DISSIPATION MODES: 1D: Point defects Density – X-Ray Diffraction FWHM (↓S1400) 2D: N° of Twins / Area (↓S1400) 3D: Stress-Induced Martensite %Vol (↑S1400) SDSSs γ-Austenite α-Ferrite MAX HOMOGENEITY BEST TT: S1400 -700 -600 -500 -400 -300 -200 -100 0 10 20 30 40 50 MPa μm Residual Stresses Depth Profile CD - Ferrite S1300 - Ferrite S1400 - Ferrite A72 - Ferrite A360 - Ferrite 0,0 5,0 10,0 15,0 20,0 25,0 30,0 35,0 CD A36 A72 A210 A360 S1300 S1400 μm Surface Roughness Rmax Ra -1,25 -1 -0,75 -0,5 -0,25 0 0,25 CD A36 A72 A210 A360 S1300 S1400 [g/(mm^2*week)] Salt Spray Fog Test Thermal Treated - Δ Weight Shot Peened - Δ Weight 250 300 350 400 450 500 550 CD A36 A72 A210 A360 S1300 S1400 HV200 Surface HV Thermal Treatment Shot Peening Effect of preparatory thermal treatments on S32760 SDSSs properties after shot peening A.F. Ciuffini , A. Gruttadauria, S. Barella, C. Mapelli, I.F. Pariente C Cr Cu Fe Mo Mn N Ni W Min - 24 0,5 Bal. 3 - 0,2 6 0,5 Max 0,03 26 1 4 1 0,3 8 1 CD S1300 S1400 A36 A72 A210 A360
Transcript of Effect of preparatory thermal treatments on S32760 SDSSs...
Shot Peening: ZrO2 Ceramic beads
(Ø=300 μm, 700 HV) Almen intensity: 10A Coverage: 100%
↑ Resistance to: Fatigue SSC Fretting Erosion
0
200
400
600
800
1000
1200
1400
1600
0 100 200 300 400 500
Tem
pe
ratu
re [
°C]
Soaking time [s/mm]
Thermal Treatment
CD
A36
A72
A210
A360
S1300
S1400
Solubilization Temperature Recrystallization Steps γ2 Precipitation
0,25 0,5 0,75 1 1,25 1,5 1,75
CD
A36
A72
A210
A360
S1300
S1400
Partition Coefficient
Chemical Distribution
Cr Mo Ni Mn
220
230
240
250
260
270
280
290
300
310
320
CD A36 A72 A210 A360 S1300 S1400
HV
10
0
Phases MicroHV
Ferrite Austenite
ENERGY DISSIPATION MODES: 1D: Point defects Density – X-Ray
Diffraction FWHM (↓S1400) 2D: N° of Twins / Area (↓S1400) 3D: Stress-Induced Martensite
%Vol (↑S1400)
SDSSs γ-Austenite α-Ferrite
MAX HOMOGENEITY
BEST TT: S1400
-700
-600
-500
-400
-300
-200
-100
0 10 20 30 40 50
MP
a
μm
Residual Stresses Depth Profile
CD - Ferrite S1300 - Ferrite S1400 - Ferrite
A72 - Ferrite A360 - Ferrite
0,0
5,0
10,0
15,0
20,0
25,0
30,0
35,0
CD A36 A72 A210 A360 S1300 S1400
μm
Surface Roughness
Rmax Ra
-1,25-1-0,75-0,5-0,2500,25
CD
A36
A72
A210
A360
S1300
S1400
[g/(mm^2*week)]
Salt Spray Fog Test
Thermal Treated - Δ Weight Shot Peened - Δ Weight
250
300
350
400
450
500
550
CD A36 A72 A210 A360 S1300 S1400
HV
20
0
Surface HV
Thermal Treatment Shot Peening
Effect of preparatory thermal treatments on S32760 SDSSs properties after shot peening
A.F. Ciuffini, A. Gruttadauria, S. Barella, C. Mapelli, I.F. Pariente
C Cr Cu Fe Mo Mn N Ni W
Min - 24 0,5 Bal.
3 - 0,2 6 0,5
Max 0,03 26 1 4 1 0,3 8 1
CD S1300 S1400
A36 A72 A210 A360
