OPTIMIZATION OF PROPERTIES IN TWO HIGH STRENGTH STAINLESS STEELS
BOEING CO RENTON WA COMMERCIAL AIRPLANE GROUP
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It was found possible to increase the strength and toughness of two high-strength stainless steels, AFC 77 and AFC 260, by austenitizing at higher- than-normal temperatures that are in the range where both austenite and delta ferrite are stable. The delta ferrite is then removed by isothermal transformation in the range 1800 to 2000F. This technique results in a greater solution of carbides and intermetallic particles and consequently in a greater amount of retained austenite than is possible at austenitizing temperatures below the delta-ferrite range. In addition, the technique permits optimum mechanical properties to be obtained over a wider compositional range.
- Properties of Metals and Alloys
- Solid State Physics