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Acta Metall Sin  2019, Vol. 55 Issue (4): 436-444    DOI: 10.11900/0412.1961.2018.00276
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Effect of Solution Temperature on Tensile Deformation Behavior of Mn-N Bearing Duplex Stainless Steel
Miao JIN1,Wenquan LI1,Shuo HAO1,2,Ruixue MEI1,Na LI1,Lei CHEN1,2()
1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Qinhuangdao 066004, China
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Abstract  

Advanced duplex stainless steels (DSSs) in which Ni is mostly or completely replaced by Mn and N have been developed in recent years. Such Mn-N bearing DSSs can readily achieve exceptional room-temperature tensile properties through the transformation-induced plasticity (TRIP) effect of metastable austenite. During the processing of DSSs, solution treatment is a critical step that tailors the phase fraction and the overall properties. In particular, the phase chemistry can change due to different element partitioning between two constituents, resulting in a different TRIP kinetics, when DSS is solution treated at different temperature. In this work, the effect of solution temperature on tensile deformation behavior of a new Mn-N bearing DSS was studied. The mechanical properties and work-hardening characteristic of the steels solution treated at different solution temperature (1000~1200 ℃) were investigated by thermal modeling test, and the effects of solution temperature on the deformation substructure and fracture characteristics were analyzed by OM, SEM and EBSD. The results show that as the solution temperature increases, the yield strength and tensile strength of the steels decrease, while the elongation (uniform elongation and total elongation) increases firstly and then decreases. The steel solution treated at 1100 ℃ shows the optimum uniform elongation of 46.7%, and a better combination of ultimate tensile strength and ductility of approximately 44.6 GPa·%. The work-hardening rate of the steel shows a three-stage characteristic, namely it declines firstly and then increases and subsequently declines again as the strain increases. However, the increasing extent of the work-hardening rate decreases as the solution temperature increases. The strain-induced martensitic transformation (SIMT) of metastable austenite which causes the TRIP effect has two evolution mechanisms of γεα' and γα'. But SIMT can be suppressed when the solution temperature increases. The fracture surfaces of specimens solution treated at different temperatures show a quasi-cleavage mode, in which both ferrite and strain-induced martensite exhibit cleavage fracture while the residual austenite displays a dimple-mode fracture. Furthermore, the Md30 which can characterize the stability of metastable austenite was calculated, which decreases from 81 ℃ to 38 ℃ as the solution temperature increases from 1000 ℃ to 1200 ℃, indicating that the TRIP effect gets weakening at a higher solution temperature, and the work-hardening and plasticity therefore decrease.

Key words:  duplex stainless steel      solution temperature      work-hardening      TRIP effect      strain induced martensite     
Received:  27 June 2018     
ZTFLH:  TG142.1  
Fund: National Natural Science Foundation of China(Nos.51675467);National Natural Science Foundation of China(Nos.51675465);Natural Science Foundation of Hebei Province(No.E2016203284);China Post Doctoral Science Foundation(Nos.2016-M600194);China Post Doctoral Science Foundation(Nos.2017T100712)
Corresponding Authors:  Lei CHEN     E-mail:  chenlei@ysu.edu.cn

Cite this article: 

Miao JIN, Wenquan LI, Shuo HAO, Ruixue MEI, Na LI, Lei CHEN. Effect of Solution Temperature on Tensile Deformation Behavior of Mn-N Bearing Duplex Stainless Steel. Acta Metall Sin, 2019, 55(4): 436-444.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00276     OR     https://www.ams.org.cn/EN/Y2019/V55/I4/436

Fig.1  Dimension of Mn-N bearing duplex stainless steels (DSSs) specimen for tensile test (unit: mm. RD—rolling direction, TD—transverse direction)
Fig.2  Microstructures of the Mn-N bearing DSSs specimen solution treated at 1000 ℃ (a), 1100 ℃ (b) and 1200 ℃ (c) (F(γ)—volume fraction of γ, ND—normal direction)
Fig.3  
T / ℃Yield strength / MPaTensile strength / MPae / %eu / %SD / (GPa·%)
1000510102742.842.043.9
105049799446.546.046.2
110048693947.546.744.6
115047385539.639.135.1
120046077230.630.123.6
Table 1  Mechanical properties of the Mn-N bearing DSSs solution treated at different temperatures
Fig.4  EBSD (a, c) and band contrast (b, d) analyses of microstructures near the fracture surface of Mn-N bearing DSSs specimen solution treated at the temperatures of 1050 ℃ (a, b) and 1200 ℃ (c, d) (The microstructures inside the circles are slip bands or (and) deformation bands)
Fig.5  EBSD analysis of deformed microstructure (30%) of the Mn-N bearing DSSs specimen solution treated at 1200 ℃ (A, B, C indicate martensites of different nucleation and growth mode, the microstructures inside the circles are slip bands or (and) deformation bands. GB—grain boundary)
Fig.6  
T / ℃εsεf
10000.080.35
10500.100.38
11000.090.38
11500.110.33
12000.130.26
Table 2  εs and εf of the Mn-N bearing DSSs solution treated at different temperatures
Fig.7  Fracture surface morphologies of the Mn-N bearing DSSs specimen solution treated at 1000 ℃ (a), 1100 ℃ (b) and 1200 ℃ (c)
Fig.8  
Fig.9  
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