| RN OAK RIDGE NATIONAL AABORATO L B Benk operated Eiy a0 UNION CARBIDE CORPORATION for the U.S. ATOMIC ENERGY COMMISSION ,7 MECHANICAL PROPERTIES OF INOR-8 CAST METAL R. W. Swindeman NOTICE This document contains information of a preliminary nature and was prepared primarily for internal use at the Qak Ridge National Laberatory. it is subject to ravision or correction and therefore does not represent a final report. The information is not to be abstracted, reprinted or otherwise given public dis- semination without the approval of the ORNL patent branch, Lege! and Infor- matien Control Department. CORY ORNL- TM- 607/9"[,5“ LEGAL NOTICE This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or implied, with respect to the accurecy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes oany liakilities with respect to the use of, or for damoges resulting from the use of any information, apparatus, methed, or process disclosed in this report. As used in the above, '‘person acting on behalf of the Commission’ includes any employee or contractor of the Commission, or amployee of such contractor, to the extent that such employes or contractor of the Cemmission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor. ORNL-TM-607 Contract No. W-7405-eng-26 METALS AND CERAMICS DIVISION Wil MECHANICAL PROPERTIES OF INOR-8 CAST METAL R. W. Swindeman Date Issued AUG 6 1963 OAK RIDGE NATTONAL LABORATORY Oak Ridge, Tennessee operated by UNION CARBIDE CORPORATION for the U. S. ATOMIC ENERGY COMMISSICN r— e MECHANICAL PROPERTIES OF INOR-8 CAST METAL R. W. Swindeman ABSTRACT Tensile and stress-rupture data for INOR-8 castings are presented., It is shown that the high-temperature strength of castings is sufficient to allow present Molten-Salt Reactor Experiment stresses for wrought metal to be used. At lower temperatures, however, the tensile strength limits the maximum stress to low values. The effect of defects in castings is illustrated. INTRODUCTION Since several components in the Molten-Salt Reactor Experiment (MSRE) fuel circulation system will be fabricated by casting, it is desirable to know the limiting strength of INOR-8 cast metal. This report swummarizes available mechanical property data on this material. Portions of the infor- mation provided here were obtained by the Haynes-Stellite Company and are 1 reported in the literature. They are included here for completeness. PROGRAM Tensile tests were performed on four heats of sand-cast metal and one heat of investment-cast metal. The chemical analyses provided by the vendor are given in Table 1. The analyses for the investment-cast heat are not known. Rod specimens were machined from cast blanks and annealed at 2150°F for 1 hr/in. of thickness. Both 0.505 and 0.250-in.-diam bars were used. All tensile tests were performed in air at an extension rate of 0.05 in./min. Stress-rupture tests were performed on the investment-cast heat. The specimens were similar to those used in the tensile testing program. 1Developmental Data on Hastelloy Alloy N, Haynes-Stellite Company brochure (May 1959). Table 1. Chemical Analyses for INOR-8 Castings Heat No. Cr Fe C Si Co Ni Mn Mo Cu P S Specified 68 5 max 0.02-0.12 1.0 max 0.2 max bal 1.0 max 1518 0.35 max 0.15 max 0.2 max 7707 a a 0.02 0.021 a a a a a a a 8860 7.2 4.0 0.07 0.27 0.20 bal 0.38 16.2 0.01 0.001 0.01 8861 7.4 4.0 0.07 0.12 0.17 bal 0.4 16.1 0.0L 0.001 0.01 9615 a a a a a a a a a a a 8Within specification but not reported. During the machining of the bars from heats Nos, 8860 and 8861, it was seen that there were flaws in the specimens. Radiography was then performed on eight bars from these heats prior to testing. RESULTS Tensile data are shown in Figs. 1 through 4. The tensile strength for sand-cast metal, shown in Fig. 1, exhibits a wide variation from one specimen to another, especially at the low temperatures. Inspection of radiographs and rupture surfaces revealed gross defects in at least nine specimens. Most of the scatter in the tensile strength can, therefore, be attributed to defects. The tensile strength for sound cast metal is about 60% of that for wrought metal. UNCLASSIFIED ORNL-DWG 63-68 100 80 ;/ 3 //// . g 60 2 o A A . A 5 A ® 40 —8——1—— HEAT ® @ o 7707 A 8860 O 8861 20 v 9615 e, m,A DEFECTIVE 0 0 200 400 600 800 1000 1200 1400 1600 TEMPERATURE (°F) Fig. 1. Ultimate Tensile Strength of Sand-Cast INOR-8. 4 UNCLASSIFIED ORNL-DWG 63-69 50 40 30 a8 20 HEAT 2 Z o 7707 _ A 8860 . | | 0 O 8861 \ v 9615 e,®, A DEFECTIVE 0 0 200 400 600 800 1000 1200 1400 1600 TEMPERATURE (°F) Fig. 2. Yield Strength of Sand-Cast INOR-8. The 0.2% offset yield strength for sand-cast metal is shown in Fig. 2. Here again the defective castings exhibit less strength than the sound castings. The yield strength for cast metal is about 80% of that for wrought metal. The tensile elongation for sand castings is shown in Fig, 3. The elongation improves with increasing temperature up to 800°F and diminishes above this temperature. Most of the sound castings have elongations better than 20% at all temperatures. The elongation is particularly sensitive to the quality of the casting and defective castings exhibit ductilities weil below those for sound metal. It was noticed that failures in defective castings occurred at shrinkage cracks and large inclusions. These flaws comprised anywhere from 10 to 40% of the cross-sectional area of the specimen. No failures in high E porosity regions were observed. B -y —— UNCLASSIFIED ORNL-DWG 63-70 70 I HE AT o 7707 A 8860 60 | // 0 8864 v 9615 e, B,A DEFECTIVE 50 / | B i < Z 40 / &2 ;ZZ?/ z o =