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Chinese Journal of Materials Research  2014, Vol. 28 Issue (9): 682-688    DOI: 10.11901/1005.3093.2014.204
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Effect of Deformation Temperature on Microstructure Evolution of S30408 Austenitic Stainless Steel for Cold-stretching Cryogenic Vessels
Ying ZHANG1,Xiaozhe GAO2,Bin ZHANG1,**(),Zhuman SONG3,Jinyang ZHENG2,Guangping ZHANG3
1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819
2. Institute of Process Equipment, Zhejiang University, Hangzhou 310027
3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
Cite this article: 

Ying ZHANG,Xiaozhe GAO,Bin ZHANG,Zhuman SONG,Jinyang ZHENG,Guangping ZHANG. Effect of Deformation Temperature on Microstructure Evolution of S30408 Austenitic Stainless Steel for Cold-stretching Cryogenic Vessels. Chinese Journal of Materials Research, 2014, 28(9): 682-688.

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Abstract  

Tensile tests of the 9% pre-strained S30408 austenitic stainless steel for cryogenic vessels were conducted at different cryogenic temperatures. Microstructures of the fractured specimens were examined. The results show that the phase transformation from γ-austenite to α'-martensite in the 9% pre-strained S30408 austenitic stainless steel was promoted under tensile deformation with a strain rate of 1.0×10-3/s at cryogenic temperatures. The lower the temperature at which tensile testing was performed, the more the amount of the phase transformation from γ into α', and the finer the martensite lath. The martensite transformation can be induced by the deformation of austenite, and the interface relationship between the α'-martensite and the γ-austenite phases is {111}γ∥{011}α' and <101>γ∥<111>α', which is in accord with the K-S model.

Key words:  metallic materials      austenitic stainless steel      cryogenic pressure vessels      strain-strengthening      deformation temperature      phase transformation     
Received:  22 April 2014     
Fund: *Supported by National Natural Science Foundation of China Nos. 51171045, 51371047& 51371180.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2014.204     OR     https://www.cjmr.org/EN/Y2014/V28/I9/682

C Si Mn P S N Ni Cr
0.02 0.38 1.77 0.029 0.001 0.068 8.05 18.29
Table 1  Chemical composition of the S30408 austenitic stainless steel (%, mass fraction)
Fig.1  Microhardness of S30408 stainless steel subjected to different treatments
Fig.2  X-ray diffraction patterns of (a) original S30408 sample and 9% pre-strained sample, and (b) 9% pre-strained samples tensiled at different temperatures
Fig.3  Volume fractions of α'-martensite and γ-austenite in the original S30408 sample, the 9% pre-strained sample, and 30408 stainless steels tensiled at different temperatures
Fig.4  TEM images of S30408 stainless steels tensiled at (a) 20℃, (b) -60℃, and (c) -196℃, respectively. The insets are the corresponding selected area electron diffraction patterns. (d) TEM image of near fracture surface deformed at -196℃
Fig.5  EBSD orientation distribution maps of tensile fracture surfaces: (a) original and (b) 9% pre-strained samples and samples tensiled at (c) 20℃, (d) -60℃ and (e) -196℃
Phase φ 1 ? φ 2 Crystal face q Crystal orientation s
Original γ 153.7° 48.2° 29.1° ( 1 ? 11 ) 1.3204° [ 01 1 ? ] 1.0704°
α 141.6° 43.2° 87.2° (011) [ 11 1 ? ]
9% γ 235.9° 44.6° 37.4° ( 1 1 ? 1 ) 4.5361° [011] 2.5318°
α 313.2° 27.5° 59.0° ( 1 ? 01 ) [ 111 ]
20 °C γ 38.1° 31.6° 72.6° ( 11 1 ? ) 2.2109° [011] 1.0433°
α 174.8° 12.4° 18.1° ( 1 ? 10 ) [ 111 ]
-60 °C γ 297.9° 44.0° 83.5° ( 111 ) 1.8293° [ 1 ? 01 ] 0.6388°
α 112.3° 36.9° 46.8° (101) [ 11 1 ? ]
-196 °C γ 157.3° 40.7° 29.6° ( 1 1 ? 1 ) 2.5393° [ 1 ? 01 ] 3.2395°
α 83.6° 25.2° 84.8° ( 1 ? 10 ) [ 11 1 ? ]
Table 2  Calculations of crystallographic orientations
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