High Temperature Creep Characteristics of In-Situ Micro-/Nano-meter TiC Dispersion Strengthened 304 Stainless Steel

doi:10.11901/1005.3093.2018.422

Chinese Journal of Materials Research

2019, Vol. 33

Issue (4): 306-312 DOI: 10.11901/1005.3093.2018.422

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High Temperature Creep Characteristics of In-Situ Micro-/Nano-meter TiC Dispersion Strengthened 304 Stainless Steel

Zifei NI^1,²(

),Feng XUE¹

1. School of Material Science and Engineering, Southeast University, Nanjing 211189, China
2. Jiangsu Key Laboratory for Structural and Functional Metal Materials Composites, Taizhou 225721, China

Cite this article:

Zifei NI,Feng XUE. High Temperature Creep Characteristics of In-Situ Micro-/Nano-meter TiC Dispersion Strengthened 304 Stainless Steel. Chinese Journal of Materials Research, 2019, 33(4): 306-312.

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Abstract

Micro-/nano-metered TiC particulates dispersion strengthened 304 stainless steel (TiC-304SS strengthened steel) were prepared by in-situ reaction technology with 2% and 5% TiC (in volume fraction) respectively. The high temperature creep properties of the plain 304SS and two TiC-304SS strengthened steels were investigated. The results show that the in situ formed TiC particulates, most of which exhibited polygonal shape, were distributed uniformly in the matrix of 304 SS and are well bonded with the matrix. Moreover, TiC particulates present a significant effect on the grain refinement of the steel matrix. It reveals that being subjected to creep test by100 MPa at 700^oC for 200 h, the grains of the plain 304SS grew up evidently with elongated shape along the loading direction, in the contrary, the grain growth tendency of the TiC-304SS strengthened steels seems to be inhibited, thereby, the creep deformation was effectively reduced. The above results imply that dislocation motion in the three steels accords with dislocation climb mechanism. Besides, the values of apparent creep stress exponent and activate energy of the two TiC-304 strengthened steels are higher than that of the plain 304SS. It is proposed that the enhancement of creep performance of TiC-304SS strengthened steel may be ascribed to the enhanced threshold stress and load transfer barrier, as well as the microstructural strengthening effect.

Key words: metallic materials TiC strengthened steel high temperature creep stress exponent creep activation energy threshold stress

Received: 02 July 2018

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.422 OR https://www.cjmr.org/EN/Y2019/V33/I4/306

Fig.1 Optical micrographs of the steels (a) 304SS; (b) 2TiC-304SS; (c) (d) 5TiC-304SS as forged and heat-treated

Fig.2 TEM image of nano-scale TiC particles in 5TiC-304SS (a) and the corresponding electron diffraction pattern (b)

Fig.3 Creep curves (a) and minimum creep rates and 200 h creep strains (b) of three steels at 700℃/ 100 MPa

Fig.4 Optical micrographs of the steels (a) 304SS; (b) 2TiC-304SS; (c) 5TiC-304SS after creep at 700℃/100 MPa

Fig.5 TEM micrographs showing dislocations in 304steelbefore (a) and after (b) creep at 700℃/100 MPa

Fig.6 TEM micrographs of 5TiC-304SS after creep at 700℃/100 MPa

Fig.7 Relation curve between minimum creep rate and applied stress of three steels

Fig.8 Relation curve between minimum creep rate and temperature of three steels

Table 1 Stress exponent n and creep activiation energy Q of three steels

Fig.9 Threshold stresses of three steels

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