The Effects of Cooling Rate on Retained Austenite Characteristics of a 0.2C-1.5Si-1.5Mn-1.0Cr-0.05Nb TRIP-Aided Martensitic Steel

Abstract:

Article Preview

With the aim of increasing the volume fraction and stability of the retained austenite characteristics in a transformation-induced plasticity (TRIP)-aided steel with wider lath-martensite structure matrix, the effects of varying the post-hot-working cooling rate of a 0.2%C-1.5%Si-1.5%Mn-1.0%Cr-0.05%Nb (mass%) steel on the retained austenite characteristics were investigated. When, after hot-working at 950°C, the steel was cooled to room temperature from 430°C above the martensite-start temperature using cooling rates lower than 3°C/s, the steel attained a higher volume fraction of metastable retained austenite and lower volume fractions of a finely dispersed martensite-austenite complex phase, carbide, and pro-eutectoid ferrite, although the volume fraction of bainitic ferrite increased. This was associated with a marked carbon-enrichment in the untransformed austenite, which was mainly due to the promoted bainitic ferrite, the initial lath martensite, and the refined prior austenitic grain.

Info:

Periodical:

Materials Science Forum (Volumes 783-786)

Main Theme:

Edited by:

B. Mishra, M. Ionescu and T. Chandra

Pages:

1015-1020

DOI:

10.4028/www.scientific.net/MSF.783-786.1015

Citation:

K. I. Sugimoto et al., "The Effects of Cooling Rate on Retained Austenite Characteristics of a 0.2C-1.5Si-1.5Mn-1.0Cr-0.05Nb TRIP-Aided Martensitic Steel", Materials Science Forum, Vols. 783-786, pp. 1015-1020, 2014

Online since:

May 2014

Export:

Price:

$35.00

* - Corresponding Author

[1] J. Kobayashi, D. V. Pham and K. Sugimoto: Special Edition of Steel Res. Int. (Proc. ICTP 2011), (2011), 598-603.

[2] J. Kobayashi, D. Ina, Y. Nakajima and K. Sugimoto: Metall. Mat. Trans. A, 44 (2013), in print.

[3] J. Kobayashi, N. Yoshikawa and K. Sugimoto: ISIJ Int., 53 (2013), 1479-1486.

[4] T. Hojo, K. Kobayashi, K. Yamamoto, A. Nagasaka, K. Sugimoto, T. Senuma and Y. Takemoto: Proc. ISAS, (2013), 169-172.

[5] K. Sugimoto, J. Sakaguchi, T. Iida and T. Kashima: ISIJ Int., 40 (2000), 920-926.

[6] J. G. Speer, D.V. Edmonds, F.C. Rizzo and D.K. Matlock: Solids State Mat. Sci., 8 (2004), 219-237.

[7] J. Kobayashi, K. Sugimoto and G. Arai: Adv. Mat. Res., 409 (2012), 696-701.

[8] O. Umezawa: J. Jpn. Inst. Light Met., 50 (2000), 86-93. (in Japanese).

In order to see related information, you need to Login.