AN INVESTIGATION OF THE CRACK-PROPAGATION RESISTANCE OF HIGH-STRENGTH ALLOYS AND HEAT-RESISTANT ALLOYS

AN INVESTIGATION OF THE CRACK-PROPAGATION RESISTANCE OF HIGH-STRENGTH ALLOYS AND HEAT-RESISTANT ALLOYS

Experiments with a compliance gage for measuring slow crack extension are described. It was found that at a temperature of 400 F a greater amount of slow crack growth occurs in the low-alloy steel--300M--than at other temperatures from 75 F to 800 F. At this same temperature (400 F) a minimum in net...

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Bibliographische Detailangaben
Hauptverfasser: JENKINS,P.C, MORRISON,J.D
Format: Report
Sprache:eng
Schlagworte:
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
RELIABILITY
SHEETS
STEEL
TENSILE PROPERTIES
TEST METHODS
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Zusammenfassung:Experiments with a compliance gage for measuring slow crack extension are described. It was found that at a temperature of 400 F a greater amount of slow crack growth occurs in the low-alloy steel--300M--than at other temperatures from 75 F to 800 F. At this same temperature (400 F) a minimum in net fracture strength and a maximum in ultimate tensile strength occur. Similar behavior at 350 F was noted for another low-alloy steel-AISI 4340. Replicate determinations of the fracture-toughness parameter, K sub c, from compliance-gage measurements of critical crack length indicate that a fair degree of reproducibility of K sub c values can be obtained by this method. Experiments with specimens of AISI 4340 steel have shown that crack lengths calculated from compliance-gage measurements agree well with actual measured crack lengths in the same specimens. (Author)