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The Resistance of HY130 Steel to Environmental Cracking in Sea Water.
DEFENCE RESEARCH ESTABLISHMENT PACIFIC VICTORIA (BRITISH COLUMBIA)
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The growing interest in high performance ships, such as hydrofoils, has necessitated a corresponding interest in high strength materials. These materials, which have a high strength to weight ratio, must meet specific requirements, such as ease of fabrication, high toughness at low temperatures, and good resistance to environmental cracking. While there are several types of alloys which can meet the requirements for strength, low temperature toughness, and ease of fabrication, the selection becomes much more limited when the resistance to environmental cracking is considered. The first high performance ship in the Canadian Navy was the hydrofoil HMCS BRAS dOR. The cracking that occurred in the 1700 MPa 250 ksi Maraging Steel foils of this ship severely limited the evaluation of the hydrofoil concept. The cracking resulted from unexpectedly high residual welding stresses and a low resistance of the welded material to crack initiation under both the freely corroding and the cathodically protected conditions. Author
APPROVED FOR PUBLIC RELEASE