The Compressive Strengths of Some Technical Metals Between 4.2° and 300°K
A hydraulic press (see Figure 1) which was constructed for high pressure work in the liquid helium temperature region has been utilized to obtain compressive testing data as a function of temperature for hot rolled 1020 steel, a pure iron, and several stainless steels.1 The lower end of the press could be placed in baths of liquid helium or nitrogen, or by using a special cryostat, the temperature of the sample could be held as long as desired at any temperature between 4.2 K and room temperature. The set-up was more convenient when used as a dead-weight tester since the pressure in the low friction hydraulic head was determined directly by using a free piston gauge, and pressures were varied by changing the weights on the piston of the gauge. Changes in sample length were obtained from the motion of a hairline on the room temperature end of the press piston using a micrometer telescope. Corrections were applied for the stretch of the support members and for the friction in the hydraulic head.
KeywordsAustenitic Stainless Steel Liquid Helium Pure Iron Ferritic Stainless Steel Liquid Helium Temperature
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