Hot Deformation Behavior and Recrystallization Controlled Rolling of Ti-V-N Plate Steels
Abstract:
The static phase transformation points and CCT curves were measured of the different levels of V and N in Ti-V-N plate steels. The steels, processed by RCR and conventional CR, respectively, were taken to test the mechanical properties and impact toughness. The results show that, with the increasing of effective V and N, the Ac1 and Ac3 decrease. When cooling rate exceeds 4°C/s, the transformation of bainite begins, and at cooling rate over 9°C/s, the pearlite transformation will not occur. With the strain rate increasing and the strain temperature decreasing, the critical strain of the austenitic dynamic recrystallization goes up. Compared with CR, the plate steels by RCR+ACC process exhibit higher yield and tensile strengths, but lower elongation and toughness, and with the effective N increasing, the strengthening effect presents more remarkably.
Author:
Sun Quanshe, Zhang Yongjia
Affiiation
Technology Center of Baoshan Iron and Steel Co. Ltd., Shanghai 201900, China.
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Source:
Application Technologies of Vanadium in Flat-rolled Steels –Vanitec Symposium, Suzhou, China, Oct. 2005, pp.69-74
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