STRESS AGING: A NEW TREATMENT FOR ALLOYS. PART FOUR: COMPARISON OF STANDARD TENSILE PROPERTIES FOR SINGLE VS. DUPLEX STRESS-AGING (THREE ULTRA-HIGH-STRENGTH STEELS).
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For alloys with a high capacity for single stress-aging, duplex stress-aging may yield further gains in useful strength without destructive losses in elongation and Relative Toughness. With duplex stress-aging, the proportional limits are higher than the initial tensile strengths of these three steels. Duplex stress-aging resulted in increases of 50,000 psi for the 0.1 offset yield strength for 4340 steel 75,000 psi for the yield strength of 4335 Si-Modified and up to 90,000 psi for the yield strength of 300M steel. For different duplex treatments, 300M steel develops proportional limits from 280,000 to 300,000 psi yield strengths from 300,000 to 315,000 psi elongations from 7 to 5 reduction of area values from 34 to 31. On a yield strength-to-density basis, duplex stress-aged 4335 Si-Modified is about equal to titanium alloy while duplex stress-aged 300M appears to be superior to any commercial alloy. Author
- Metallurgy and Metallography
- Fabrication Metallurgy