Conclusions
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1.
A method was developed for determining the proof stress of austenite in a dispersed mixture with martensite by measuring the internal friction. There is a direct correlation between the resistance to small plastic deformations of austenite (proof stress) and one of the characteristics of internal friction—the tangent to the slope of the ADIF curve at amplitudes ensuring the necessary change in the dislocation arrays associated with plastic deformation. This method can be used to solve similar problems in other multiphase systems.
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2.
A continuous increase of the proof stress of austenite in the process of the martensitic transformation was found experimentally in alloy N28G1.5—from 10 kgf/mm2 in the original condition to 40 kgf/mm2 with formation of 58% martensite, associated with phase strain hardening processes.
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Literature cited
M. E. Blanter, ,“Martensitic transformation and mechanical condition of the original phase,” Metalloved. Term. Obrab. Met., No. 5, 7 (1975).
M. E. Blanter and B. G. Serebrennikova, ,“The nature of thermal stabilization of austenite,” Metalloved. Term. Obrab. Met., No. 7, 5 (1972).
M. E. Blanter and P. V. Novichkov, ,“The nature of the martensitic transformation,” Metalloved. Term. Obrab. Met., No. 6, 11 (1957).
Additional information
All-Union Correspondence Machine Construction Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 7–10, June, 1977.
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Blanter, M.E., Sobiev, A.S. Change in the proof stress of austenite with the martensitic transformation. Met Sci Heat Treat 19, 430–434 (1977). https://doi.org/10.1007/BF00713076
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DOI: https://doi.org/10.1007/BF00713076