Creep Properties of Pre-deformed F316 Stainless Steel

doi:10.11901/1005.3093.2018.677

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 497-504 DOI: 10.11901/1005.3093.2018.677

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Creep Properties of Pre-deformed F316 Stainless Steel

Dongying WANG¹,Liyi WANG²,Xin FENG³,Bin ZHANG³,Xingping YONG¹,Guangping ZHANG²(

)

1. Shenyang Blower Works Group Corporation, Shenyang 110869, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

Dongying WANG,Liyi WANG,Xin FENG,Bin ZHANG,Xingping YONG,Guangping ZHANG. Creep Properties of Pre-deformed F316 Stainless Steel. Chinese Journal of Materials Research, 2019, 33(7): 497-504.

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Abstract

Creep properties of the pre-deformed F316 stainless steel by 200 MPa at 650℃, 670℃ and 700℃ were investigated. Results show that by a constant tensile stress of 200 MPa, the time to rupture of the pre-deformed F316 stainless steel decreases, while the steady creep rate and the instantaneous creep strain increase with increasing creep temperature. Ductile fracture is the dominant rupture mode for the pre-deformed F316 stainless steel. Creep cavities are mainly located in the triple junctions of grain boundaries, and the average diameter and the area ratio of the voids decrease in the location with the increasing distance to the fracture surface. In the region with the same distance to the fracture surface, the average diameter and area percentage of the voids increase obviously with the increasing creep temperature. The present pre-deformed F316 stainless steel with high density of twins has a better creep resistance than that of non-pre-deformed ones. Time to rupture by 200 MPa at 350℃ was estimated by using the Larson-Miller and θ-projection methods, respectively. The results show that the θ-projection method can give a better correlation. Besides, the long-term creep reliability of the F316 stainless steel served by 200 MP at 350℃ was discussed based on the Larson-Miller and θ-projection methods.

Key words: metallic materials F316,austenite stainless steel creep properties Larson-Miller parameter method θ-projection method

Received: 27 November 2018

ZTFLH:	TG142.71
	TG111.8

Fund: National Science and Technology Major Project of China(2013ZX06002-002);National Natural Science Foundation of China(51771207);National Natural Science Foundation of China(51671050)

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	Dongying WANG
	Liyi WANG
	Xin FENG
	Bin ZHANG
	Xingping YONG
	Guangping ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.677 OR https://www.cjmr.org/EN/Y2019/V33/I7/497

Fig.1 Microstructure images of as-received pre-deformed F316 stainless steel (a) LSCM (b) EBSD, and (c) TEM

Fig.2 Creep strain (a) and creep rate as a function of creep times (b) of pre-deformed F316 stainless steel under 200 MPa at 650℃, 680℃ and 700℃, respectively

Table 1 Creep properties of pre-deformed F316 stainless steel under 200 MPa at 650℃, 680℃, and 700℃

Fig.3 SEM images of fractures of the creep ruptured samples under 200 MPa at temperatures of (a-c) 650℃, (b-f) 680℃, and (g-i) 700℃

Fig.4 Optical microscope observation on microstructures of creep fractured samples under 200 MPa at temperatures of (a-b) 650℃, (c-d) 680℃ and (e-f) 700℃, respectively; (a), (c) and (e) cross-section images; (b), (d) and (f) longitudinal-section images

Fig.5 Comparison of pre-deformed and non-preformed creep property of F316 stainless steels

Fig.6 TEM images of microstructures of creep ruptured samples under 200 MPa at temperatures of 650℃ (a), 680℃ (b) and 700℃ (c)

Table 2 The θ_i parameters obtained by fitting at two different temperatures

Table 3 The A_i and B_i parameters under load of 200 MPa

Table 4 Predicted θ_i parameters under 200 MPa at 680℃

Table 5 Predicted θ_i parameters under 200 MPa at 350℃

Fig.7 Comparison of predicted curves via θ parameter method and actual creep under 200 MPa at temperatures of (a) 680℃, (b) 350℃

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