An Anomalous Decrease of the Elastic Moduli at Very Low Temperatures in Some 300 Series Stainless Steels
Many AIS I 300 series steels are used for a variety of applications at cryogenic temperatures. For some applications an accurate knowledge of Young’s modulus and the shear modulus is very useful. For this reason, the elastic moduli of a number of materials were measured isothermally at low temperatures in conjunction with other mechanical property tests. Some of the 300 series stainless steels exhibited a decrease between 76° and 20°K. This anomaly was documented by additional shear modulus measurements of AISI 302, 303, and 310 steels in both the annealed and cold drawn conditions. For these tests, a torsion apparatus was used to measure the shear modulus and a special strain gauge extenso-meter was used to measure the Young’s modulus. The decrease in moduli has been attributed to a paramagnetic to antiferromagnetic transition which occurs in 18Cr-8Ni alloys in the temperature range 37° to 42°K. This paper presents a brief summary of the experimental techniques and the experimental results of the above program.
KeywordsElastic Modulus Shear Modulus Mechanical Property Test Antiferromagnetic Transition Cryogenic Engineer
Unable to display preview. Download preview PDF.
- 1.R. M. McClintock and K. A. Warren, Mater. Res. Std. 1, 95 (1961).Google Scholar
- 2.K. A. Warren and R. P. Reed, NBS Monograph 63 (1963).Google Scholar
- 3.R. P. Mikesell and R. M. McClintock, in Advances in Cryogenic Engineering, Vol. 7, Plenum Press, New York (1962), p. 509.Google Scholar
- 4.R. P. Reed and R. P. Mikesell, in Advances in Cryogenic Engineering, Vol. 4, Plenum Press, New York (1960), p. 84.Google Scholar
- 6.E. I. Kondorskii and V. L. Sedov, Soviet Phys.-JETP 8, 1104 (1959).Google Scholar
- 10.R. P. Mikesell and R. P. Reed, CEL-NBS experimental data, to be published.Google Scholar