Metallurgical Design Considerations for PRECIPITATION-HARDENING STEELS UP TO 1200 F 580057

THE latest development in materials for highspeed aircraft and missiles in precipitationhardening steel. This paper describes in detail five of the new alloys: 17-7PH, 17-4PH, AM 350, AM 355 and A-286. The materials are designed for use up to 1200 F, although long exposure is not feasible above 800 F.
The author discusses the chemistry of each alloy and the effect of heat-treatment on them. He points out that although the new alloys are weldable, the metallurgical characteristics must be realized to assure consistent crack-free weldments.
Careful handling and control of the alloys during fabrication and treatment are essential.


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