The Mechanical Properties of Stainless Steel Castings at 4 K
The limited use of stainless steel castings for 4-K service is partially due to the limited data available on their mechanical properties at 4 K.1 The most significant 4-K data available on the tensile and fracture toughness properties of stainless steel castings came from a series of CF8 centrifugal castings with varying delta-ferrite contents.1,2 There were six heats from three different vendors with delta-ferrite contents ranging from 0 to 14.5 percent. The results generally showed an increase in strength and a decrease in fracture toughness with increasing ferrite content.
KeywordsFracture Toughness Ferrite Content Fracture Toughness Test Room Temperature Mechanical Property Fracture Toughness Property
Unable to display preview. Download preview PDF.
- 1.D. Dew-Highes and K. S. Lee, The choice of steel for the Isabelle magnet tubes, in“Advances in Cryogenic Engineering—Materials” Vol. 26, Plenum Press, New York (1981), pp. 151–157.Google Scholar
- 2.E. L. Brown, T. A. Whipple, and R. L. Tobler, Fracture toughness of CF8 castings in liquid helium, to be published in Metall. Trans. Google Scholar
- 3.L. Finch, The influence of ferrite and nitrogen on the mechaniproperties of CF8M cast stainless steel, in“Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures— IV,” NBSIR 81-1645, National Bureau of Standards, Boulder, Colorado (1981), pp. 337–355.Google Scholar
- 4.R. P. Reed, A cryostat for tensile tests in the temperature range 300 to 4 K, in “Advances in Cryogenic Engineering,” Vol. 7, Plenum Press, New York (1961), pp. 448–454.Google Scholar
- 5.T. A. Whipple, The effect of delta-ferrite on the mechanical properties of CF8M stainless steel castings at 4 K, in“Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures—V,” to be published by the National Bureau of Standards, Boulder, Colorado.Google Scholar
- 6.M. G. Dawes, Welding Institute Research Bulletin No. 7 (1976), p. 185.Google Scholar
- 7.D. T. Read, The computer-aided J-integral test facility at NBS, in“Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures—III,” NBSIR 80-1127, National Bureau of Standards, Boulder, Colorado (1980), p. 205.Google Scholar