STP563

    Dynamic Fracture Toughness Measurements of High-Strength Steels Using Precracked Charpy Specimens

    Published: Jan 1974


      Format Pages Price  
    PDF Version (468K) 26 $25   ADD TO CART
    Complete Source PDF (4.7M) 26 $68   ADD TO CART


    Abstract

    The dynamic fracture toughness, KId, was measured in a number of ferrous alloys using precracked Charpy specimens and an instrumented impact machine. The alloys investigated included quenched and tempered steels (H-11, D6AC, and 4340), 18Ni maraging steels (grades 200, 250, and 300) and a high-temperature, stainless maraging steel (Pyromet X-15). Standard Charpy specimens were precracked in fatigue and tested at either 72°F (22°C) or -65°F (-54°C). Values of KId, were determined as a function of yield strength and microstructure, and correlations were established between KId and both the energy to initiate fracture, Wm/A, and the total energy of fracture, W/A. The instrumented, precracked Charpy test is shown to be a convenient method of determining relative fracture toughness; under proper conditions this test procedure can be used to determine the dynamic planestrain fracture toughness.

    Keywords:

    impact tests, dynamic tests, toughness, fracturing, ferrous alloys, strain rate, low temperature tests, evaluation tests


    Author Information:

    Koppenaal, TJ
    Supervisor, Philco-Ford Corporation, Newport Beach, Calif.


    Paper ID: STP32187S

    Committee/Subcommittee: E28.07

    DOI: 10.1520/STP32187S


    CrossRef ASTM International is a member of CrossRef.