THERMOMECHANICAL TREATMENTS APPLIED TO ULTRAHTRENGTH BAINITIES.
Progress rept. no. 2, 15 Apr-15 July 63,
MANLABS INC CAMBRIDGE MASS
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The pertinent martensite and bainite transforma tion characteristics of 4350 and H11 were established. The tensile properties of H11 bainite were determined as a function of various processing parameters for selected thermal and thermomechanical treatments. A wide range of strength and ductility properties may be obtained by proper control of the treatment variables. The deformation of H11 bainite can develop a yield strength over 370,000 psi with an elonga tion of 2.3. The formation of bainite out of deformed austenite produces an elongation of approximately 12 with yield strengths from 140,000 to 275,000 depending upon the treatment. The investigation was extended to similar treat ments of 4350 and some results are presented. The microstructural changes resulting from the thermal and thermomechanical treatments are being studied by light and electron microscopy. Author