Tensile flow and work-hardening behavior of a Ti-modified austenitic stainless steel

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 28; no. 1; pp. 171 - 178
• Main Authors: SIVAPRASAD, P. V, VENUGOPAL, S, VENKADESAN, S
• Format: Journal Article
• Language: English
• Published: New York, NY Springer 1997
• Subjects: Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Physics; Treatment of materials and its effects on microstructure and properties; Austenitic stainless steel; Temperature effects; Stress-strain relation; Plastic deformation; Steels; Experimental study; Stainless steels; Titanium additions; Strain hardening; Flow stress
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-997-0092-8

The flow-stress data of a 15Cr-15Ni-2.2Mo-Ti modified austenitic stainless steel in the temperature range 300-1023K was analyzed in terms of Ludwigson and Voce equations. The parameters of these equations were critically examined with respect to the effect of Ti/C ratio and test temperature. It was found that the Ludwigson equation described the flow behavior adequately up to the test temperature of 923K, whereas the Voce equation could be employed in the full temperature range. The peaks/plateaus observed in the variation of these parameters as a function of temperature in the intermediate temperature range have been identified as one of the manifestations of dynamic strain aging (DSA). Also, the variation of these parameters with temperature clearly could bring out the different domains of DSA observed in this alloy. The work-hardening analysis of the flow-stress data revealed that in the DSA regime, the onset of stage III hardening is athermal.