Erratum to: Advanced lightweight alloys for aerospace applications

JOM, Jul 1989

William E. Frazier Ph.D., Eui W. Lee Ph.D., Mary E. Donnellan M.S., James J. Thompson B.S.

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Erratum to: Advanced lightweight alloys for aerospace applications

Figure 6. Microstructural development of the unidirectionally solidified casting. (a) As cast. (b) Solutionized at 1,093°C for 9 hr. (c) Solutionized, and then aged at 510°C for 3 hr. Table II. Hardness Improvement Through Double Heat Treatment Solutionized at As-Cast 1,093°C for 10 hr. - a".' ~ 1,379 g. ~ U5 .!!l 'i?! 689 ~ o '- '--'--- -'-Room Temp. 343'C 1,038'C Investment Mold Temperature b '-----' 25~m '-----' 25~m '-----' 25 ~m Property or Characteristic Casting Range (OC) Density (g/cm3) Tensile Modulus (GPa) UTS (MPa) Elongation (%) Thermal Conductivity at 100°C (W/m'K) Hardness within the primary nickel matrix. It is this matrix phase which provides hardening through precipitation after the aging treat­ ment. The Vickers microhardness and Rock­ well hardness in the as-cast, solutionized, and aged conditions are compared in Table II. The Vickers hardness in the as­ cast condition is 358, which decreases significantly upon solutionizing through the eliminationof microsegregation. Then the hardness of the material increases to 474 after the aging treatment. The Rock­ well hardness (Rc) follows a similar trend. The alloy also offers good strength in the as-cast condition, which is further im­ proved by the two-step heat treatment (i.e., solutionizing and aging). Table III compares the properties of 8erylco 42C with AISI304 stainless steel. The casting temperatures for the 42C al­ loy are 1,230-1 ,343°C, and, for stain­ less steel, the corresponding range is 1,482-1 ,593°C. The lower casting tem­ peratures give manufacturing flexibility during processing by using lower cost nonferrous materials and processes. The modulus values are comparable. The Correction Solutionized + Aged at 510°C for 3 hr. 474 44 AISI 304 Stainless Steel 1,482-1 ,593 7.75 1~ 531 55 15.9 Rs = 84 Berylco 42C 1,230-1 ,343 8.1 1~ 1,034 6 34.6 Rc = 38 tensile strength is almost double that of stainless steel, and the 6% elongation in castings is considered adequate in many applications. The important aspect to note is thatthe thermal conductivity ofthe material is nearly twice that of stainless steel, enabling rotating applications where heat dissipation is a critical attribute. ACKNOWLEDGMENT The authors thank NGK Metals Cor­ poration andArwood Corporation, where this work was conducted, for permission to publish this paper. If you want more information on this subject, please circle reader service card number 60. Alloy AZ91C-T6t AZ91E-T6 WE54-T6 EA55B-T6 EA55RS-T4 EA65B-T6 EA65RS-T4 '20 days in a neutral salt log. tAZ91 C is a currently used alloy shown lor comparison. 1. "Berylco Beryllium Nickel Alloys," Product Application Review , NGK Metals Corporation , Reading, PA. 2. E. W. Filer , "Nickel-Beryllium Alloys Resistance to Sullide Stress Cracking," Corrosion Microstructure and Metallogra· phy, 12 ( 1985 ), pp. 89 - 101 . 3. Y.V. Murty , T.Z. Kattamis , R. Mehrabian and M.C. Flemings , " Behavioral Sullide Inclusions During Thermomechanical Processing 01 AISI 4340 Steel," Metallurgical Transac· tions A , 8A ( 1977 ), pp. 1275 - 1281 . 4. Metals Handbook , Desk Edition (Metals Park, Ohio: ASM, 1985 ), pp. 23 . 21 - 23 . 26 .


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William E. Frazier Ph.D., Eui W. Lee Ph.D., Mary E. Donnellan M.S., James J. Thompson B.S.. Erratum to: Advanced lightweight alloys for aerospace applications, JOM, 1989, 58-58, DOI: 10.1007/BF03220278