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MOLTEN-SALT REACTOR PROGRAM - page 72 / 122

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18.1.2 New Specimens in the Surveillance Assembly214

18.2 Mechanical Properties of MSRE Surveillance Specimens216

19. GRAPHITE STUDIES224

19.1 Procurement of Graphite224

19.2 Physical Property Measurements226

19.3 Bend Testing of Graphite227

19.4 X-Ray 8tudies228

19.5 Gas Impregnation of Graphite with Carbon230

19.6 Graphite Surface Sealing with Metals231

19.7 Graphite Irradiation Experiments233

19.8 Small-Angle X-Ray Scattering Measurements in Graphite235

20. HASTELLOY N237

20.1 Development of Titanium-Modified Hastelloy N237

20.1.1 Commercial Melts237

20.1.2 Laboratory Melts238

20.2 Aging of Modified Hastelloy N239

20.3 Influence of Irradiation Temperatures on the Post-irradiation Mechanical

Properties of Titanium-Modified Hastelloy N244

20.4 Electron Microscope Studies247

20.4.1 Precipitation in Standard Hastelloy N247

20.4.2 Titanium-Modified Hastelloy N247

20.5 Weldability of Titanium-Modified Hastelloy N250

20.6 Measurement of Residual Stresses in Hastelloy N Welds256

20.7 Corrosion Studies257

20.7.1 Fuel Salts257

20.7.2 Blanket Salts262

20.7.3 Coolant Salts264

20.7.4 Haynes Alloy No. 25 Corrosion265

20.7.5 Flow Velocity in Natural Circulation Loops266

20.8 Forced Convection Loop266

20.9 Oxidation of Ni-Mo-Cr-Fe Alloys269

21. GRAPHITE-TO-METAL JOINING271

21.1 Introduction271

21.2 Graphite Brazing271

21.3 Graphite-Hastelloy N Transition Joint Development272

2l.3.1 Heavy-Metal Alloy Development273

21.3.2 Fabrication and Testing of Joints273

21.4 Nondestructive Testing of Graphite-to-Metal Joints276

22. SUPPORT FOR COMPONENTS DEVELOPMENT PROGRAM278

22.1 Welding Irradiated Materials278

22.1.1 Development of Apparatus and Procedures for Welding Irradiated Samples278

22.1.2 Mechanical Properties of Hastelloy N Welded After Irradiation278

22.2 Molten-Salt Distillation Experiment282

22.2.1 Examination of Specimens from the Distillation Experiment282

22.2.2 Examination of Plug from Distillation Vessel285

22.3 X-Ray Examination of Bearing Coatings285

22.4 Liquid-Level Probe Analysis285

22.5 Fabrication of Fluted Tubing for Enhanced Heat Transfer289

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