Use of the reverse martensitic transformation and precipitation to enhance the strength and stability of austenite
The addition of martensitic and reverse martensitic phase transformations to precipitation hardening results in significant strengthening of Fe--Ni--Ti austenitic alloys due to the transformation-induced defects. Multiple cycles of ..gamma..--..cap alpha..'--..gamma.. transformations led to a further strengthening. The stability of ausaged austenite as well as ausaged and transformation strengthened austenite is improved significantly through a final isothermal treatment at 500/sup 0/C. This stabilization results in an increase of both the strength and the ductility in less stable (mechanically) austenites while only the increase of ductility was observed in relatively stable austenites.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7223309
- Report Number(s):
- LBL-4557; CONF-760572-1
- Country of Publication:
- United States
- Language:
- English
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