PDF《Alloy 690 Base Metal》

600 &

St.Steel

30 MPa√m, 288C Water Sens

304 SS Round Robin (open) Circles = constant load Triangles = gentle cyclic SO4 &

Cl data in pink 42.5 28.3 14.2 μin/h 0.25 0.1 0.06 μS/cm ←

200 ←

2000 ppb O

2 ←

42000 SS PLEDGE Predictions * Normal YS Includes: * All alloys tested * All heat treatments * No cold work data * Medium screening Expected peak in CGR for Alloy

182 vs. H2 in pure water CGR data in pure water in Ar or low H2 1.E-09 1.E-08 1.E-07 1.E-06 1.E-05 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 Corrosion Potential, Vshe Crack Growth Rate, mm/s Sensitized

304 Stainless Steel

30 MPa√m, 288C Water 0.06-0.4 μS/cm, 0-25 ppb SO4 SKI Round Robin Data filled triangle = constant load open squares = gentle cyclic 42.5 28.3 14.2 μin/h GE PLEDGE Predictions

30 MPa√m 0.5 Sens SS 0.25 0.1 0.06 μS/cm ←

200 ppb O

2 ←

500 ppb O

2 ←

2000 ppb O

2 0.1 μS/cm Means from analysis of

120 lit. sens SS data 0.06 μS/cm

2000 ppb O2 Ann. 304SS

200 ppb O2 316L (A14128, square ) 304L (Grand Gulf, circle ) non-sensitized SS 50%RA

140 C (black ) 10%RA 140C (grey ) 20% CW A600 20% CW A600 GE PLEDGE Predictions for Unsens. SS (upper curve for 20% CW)

4 dpa 304SS Square &

rectangular data are CW SS &

CW A600 Alloy

690 Base Metal Strategy

9 SCC Response SCC Response vs. YS vs. YS Effect of Yield Strength on Crack Growth Rate 1.E-08 1.E-07 1.E-06

0 100

200 300

400 500

600 700

800 Yield Strength, MPa Crack Growth Rate, mm/s

2 Sensitized Points for Comparison Annealed Cold Worked Unsensitized 304, 304L &

316L SS &

A600 288o C High Purity Water,

2000 ppb O2 CT Tests at 27.5 -

30 MPa√m Circles = high martensite SS Triangles = Alloy

600 Very high martensite Very low or no martensite Predicted Response Effect of Yield Strength on Crack Growth Rate 1.E-09 1.E-08 1.E-07

0 100

200 300

400 500

600 700

800 Yield Strength, MPa Crack Growth Rate, mm/s

2 Sensitized Points for Comparison Annealed Cold Worked at -55o C or +140o C Unsensitized 304, 304L &

316L SS &

A600 288o C High Purity Water,

95 or

1580 ppb H2 CT Tests at 27.5 -

30 MPa√m Circles = high martensite SS Triangles = Alloy

600 Very high martensite Very low or no martensite Predicted Response High potential Low potential Alloy

690 Base Metal Strategy

10 Effects of Yield Strength / Cold Work Effects of Yield Strength / Cold Work Weld residuals strains are highest at the fusion line and then drop off. Residual strain is highest at weld root due to repeated weld passes. Alloy

690 Base Metal Strategy

11 Weld Residual Strain Affects SCC Like CW Weld Residual Strain Affects SCC Like CW Weld HAZ aligned CT specimen of high quality German

348 SS.

8 C

10 weld HAZ aligned specimens of various materials tested 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9

0 100

200 300

400 500

600 700

800 Time, hours Crack Length, mm

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 Conductivity, uS/cm or Potential, V she 3.2 x 10-7 mm/s 0.5T CT of HAZ Aligned

348 Weld 288C,

2 ppm O2,

25 ksi√in Corrosion Potential of CT Outlet Conductivity Corrosion Potential of Pt 2.2 x 10-7 mm/s To

200 ppb O

2 @ 565h Alloy

690 Base Metal Strategy

12 EBSD of Double EBSD of Double- -Cone Compression of Alloy

182 Cone Compression of Alloy

182 ? Six transverse direction specimens. Upset at strain rate = 0.01/sec ? Final Strains: 0.05, 0.11, 0.22, 0.36, 0.51, 0.69 ? Six longitudinal direction specimens. Upset at strain rate = 0.01/sec ? Final Strains: 0.05, 0.11, 0.22, 0.36, 0.51, 0.69 ? 140°C isothermal, corrected for adiabatic heating Alloy