Drop-weight Tests of Experimental Hy-130/150 Steels PDF Download

Author: S. T. Rolfe
Publisher:
ISBN:
Category :
Languages : en
Pages : 37

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Book Description
One of the most important requirements of HY130/150 steels and weldments is high fracture toughness. For laboratory screening of experimental steels, fracture toughness can be most conveniently determined from Charpy V-notch impact tests. However, fracture-toughness values obtained from drop-weight and explosion-bulge tests are also important, and correlations between these tests and the Charpy V-notch test have not been established for steels having yield strengths in the range 130 to 150 ksi. Therefore, the Applied Research Laboratory conducted Charpy V-notch and drop-weight tests of 1/2- and 1-inchthick plates of four experimental HY-130/150 steels (3 3/4Ni-Cr-Mo-V, 5 1/4Ni-Cr-Mo-V, 5Ni-CrMo-V, and 7 1/2Ni-Cr-Mo steels) and HY-80 steel (heat-treated to a yield strength of 150 ksi) to determine the relation between Charpy V-notch and drop-weight test criteria and to determine the best method for obtaining fracture-toughness values to screen experimental HY-130/150 steels. The results indicated that for HY-130/150 type steels, the drop-weight test nil-ductility temperature (NDT) can be estimated from Charpy Vnotch test data by determining the temperature corresponding to an energy absorption of about 40 ft-lb, a shear fracture of about 50 percent, or a lateral expansion of about 20 mils. (Author).