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Acta Metall Sin  2020, Vol. 56 Issue (7): 949-959    DOI: 10.11900/0412.1961.2019.00376
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Effect of Mn Addition on High Temperature Tensile Behavior of 23%Cr Low Nickel Type Duplex Stainless Steel
DENG Yahui, YANG Yinhui(), PU Chaobo, NI Ke, PAN Xiaoyu
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
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Abstract  

There are different crystal structures and stacking fault energies (SFEs) for two phases of duplex stainless steel (DSS), and the Mn substitution for Ni also can change SFE of two phases and cause austenite stability variation during high temperature deformation. Thus, the thermal deformation behavior of DSS with Mn addition become more complex compared with that of single phase steel during high temperature tensile process. In this work, the high temperature tensile behavior of 23%Cr low nickel type DSS with different Mn contents (6.26%~14.13%, mass fraction) has been studied in the temperature of 300~1050 ℃ at strain rate of 0.01 s-1 by using a thermal simulation machine. The results showed that the austenite phases mainly accommodate tensile deformation stress, and the volume fraction of them increased with increasing Mn contents, which is beneficial to enhance the thermoplasticity, and has little effect on the tensile strength. With more Mn addition, the reduction of area increases when deformed in the temperature of 550~1050 ℃, but decreases at lower temperature of 300 ℃. The value of crack sensitive point increased slightly when stretched at lower temperature (450 ℃, 750 ℃) with more Mn addition, and optimum plastic temperature zones are in the range of 500~650 ℃ and 850~1050 ℃. The effect of Mn addition on work hardening rate is slight when deformed at 300 ℃, while high Mn addition is favorable for dynamic recrystallization occurence at lower strain when deformed at higher temperature of 1050 ℃. The tensile deformation microstructure of different Mn addition samples are mainly dependent on the austenite dislocations evolution. As the Mn content attained 14.13%, a large number of dislocation cells with high density and small size formed in austenite phase, which is contributed to grains refinement and improves thermoplasticity.

Key words:  duplex stainless steel      low nickel type      Mn addition      thermoplasticity     
Received:  08 November 2019     
ZTFLH:  TG142  
Fund: National Natural Science Foundation of China(51461024);National Natural Science Foundation of China(51861019)
Corresponding Authors:  YANG Yinhui     E-mail:  yyhyanr@sina.com

Cite this article: 

DENG Yahui, YANG Yinhui, PU Chaobo, NI Ke, PAN Xiaoyu. Effect of Mn Addition on High Temperature Tensile Behavior of 23%Cr Low Nickel Type Duplex Stainless Steel. Acta Metall Sin, 2020, 56(7): 949-959.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00376     OR     https://www.ams.org.cn/EN/Y2020/V56/I7/949

No.CSiMnSPCrNiMoCuNFe
10.040.226.260.0040.00823.32.151.410.140.26Bal.
20.040.2310.270.0040.00623.32.121.350.140.28Bal.
30.040.2514.130.0030.00623.62.201.290.140.28Bal.
Table 1  Chemical compositions of duplex stainless steels
Fig.1  True stress-true strain curves of different Mn addition duplex stainless steel samples tensiled at strain rate 0.01 s-1 under di?erent temperatures(a) 6.26%Mn(b) 10.27%Mn(c) 14.13%Mn
Fig.2  OM images showing the deformation microstructures of near fracture morphologies normal to the tensile direction for the duplex stainless steel samples solution treated (a, c, e) and tensioned at 550 ℃ (b, d, f) (a, b) 6.26%Mn (c, d) 10.27%Mn (e, f) 14.13%Mn
Fig.3  Volume fraction variations of austenite phase for the duplex stainless steel samples solution treated and tensioned at 550 ℃ with different Mn additions
Fig.4  Strain hardening rate-strain curves of different Mn addition duplex stainless steel samples under tensile temperatures of 300 ℃ (a), 550 ℃ (b), 800 ℃ (c) and 1050 ℃ (d) (εp—peak strain)
Fig.5  Tensile strength (a) and reduction of area (b) at different tensile temperatures for the duplex stainless steel samples with different Mn additions
Fig.6  Characteristic curves of high temperature tensile strength versus reduction of area for the duplex stainless steel samples
(a) 6.26%Mn
(b) 10.27%Mn
(c) 14.13%Mn
Fig.7  Tensile fracture SEM images of duplex stainless steel samples tensioned under 300 ℃ (a, c, e) and 550 ℃ (b, d, f)
(a, b) 6.26%Mn (c, d) 10.27%Mn (e, f) 14.27%Mn
Fig.8  SEM fractographs (a, c, e) and corresponding EDS of inclusions (b, d, f) taken at the edge parts of tensile duplex stainless steel samples at 550 ℃
(a, b) 6.26%Mn (c, d) 10.27%Mn (e, f) 14.27%Mn
Fig.9  Bright field TEM images at the near parts of tensile fractured duplex stainless steel samples with different Mn addition at 550 ℃
(a) 6.26%Mn, sub-grain structure(b) 6.26%Mn, cellular structure in austenite phase(c) 6.26%Mn, two phases(d) 10.27%Mn, two phases(e) 10.27%Mn, tangled dislocations in austenite phase(f) 10.27%Mn, cellular structure in austenite phase(g) 14.13%Mn, two phases(h, i) 14.13%Mn, cellular structure in austenite phase
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