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Acta Metall Sin  2019, Vol. 55 Issue (12): 1495-1502    DOI: 10.11900/0412.1961.2019.00220
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Mechanical Characteristics of TRIP-Assisted Duplex Stainless Steel Fe-19.6Cr-2Ni-2.9Mn-1.6Si During Cyclic Deformation
CHEN Lei1,2,HAO Shuo2,ZOU Zongyuan2,HAN Shuting2,ZHANG Rongqiang2,GUO Baofeng2()
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
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Abstract  

Duplex stainless steel (DSS) is a type of steel with ferritic-austenitic duplex structure. It has been widely used in the engineering field such as petrochemicals and oceans. Recently, a series of economical DSSs with TRIP effect have been developed by replacing Ni-Mo with Mn-N. Generally, most structural components are subjected to periodic alternating loads during service, and then cyclic deformation which causes different mechanical responses with monotonous loading condition occurs. In this work, the mechanical properties of a Mn-N bearing DSS Fe-19.6Cr-2Ni-2.9Mn-1.6Si during cyclic deformation condition were studied and the microstructural mechanism was characterized by TEM. The results show that the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel exhibits enhanced mechanical properties and a typical "three-stage" hardening characteristic due to TRIP effect under monotonic loading condition. Cyclic hardening/softening characteristics of the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel are sensitive to strain amplitude and the number of cycle (N). At a small strain amplitude, cyclic hardening occurs firstly when N<5 cyc, then cyclic softening starts and cyclic deformation gradually trends to a stabilization. At a large strain amplitude, after a rapidly cyclic hardening (N<5 cyc), the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel is continuously softened until failure and no stabilization occurs. The dislocation walls form in ferrite during cyclic deformation which responsible for the overall cyclic softening of the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel; While austenite undergoes cyclic induced ε martensite transformation at large strain amplitude whereby the softening is suppressed, so that the cyclic softening rate of the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel increases rapidly with the increase of the (plastic) strain amplitude, followed by a slow increase and a final decrease. Compared with the monotonous loading condition, the Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel shows a law of "hardening→softening→ re-hardening" with the increase of strain amplitude. In particular, there is a three-stage linear relationship between logarithmic cyclic stress amplitude and logarithmic plastic strain amplitude (lgσa-lgεa), and the corresponding cyclic hardening index (n') are: 0.16 (stage I), 0.09 (stage II) and 0.17 (stage III), respectively. The change of n' in each stage is related to the coordinated deformation between two phases (I→II) and the cyclic induced ε martensitic transformation (II→III).

Key words:  Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel      TRIP effect      cyclic deformation      hysteresis loop      cyclic hardening/softening      cyclic induced martensite     
Received:  04 July 2019     
ZTFLH:  TG142.1  
Fund: National Natural Science Foundation of China(Nos.51675467);National Natural Science Foundation of China(51675465);National Natural Science Foundation of China(51905467);Natural Science Foundation of Hebei Province(No.E2019203560);Project Funded by China Post Doctoral Science Foundation(Nos.2016M600194);Project Funded by China Post Doctoral Science Foundation(2017T100712)
Corresponding Authors:  Baofeng GUO     E-mail:  baofengysu@163.com

Cite this article: 

CHEN Lei, HAO Shuo, ZOU Zongyuan, HAN Shuting, ZHANG Rongqiang, GUO Baofeng. Mechanical Characteristics of TRIP-Assisted Duplex Stainless Steel Fe-19.6Cr-2Ni-2.9Mn-1.6Si During Cyclic Deformation. Acta Metall Sin, 2019, 55(12): 1495-1502.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00220     OR     https://www.ams.org.cn/EN/Y2019/V55/I12/1495

Fig.1  Initial microstructure (a) and schematic of sample (unit: mm) (b) of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel
Fig.2  Engineering stress-Engineering strain curve (a) and true stress-true strain and work hardening rate curves (b) of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel during monotonic loading (σE—engineering stress, εE—engineering strain, σ—true stress, ε—true strain, θ—work hardening rate)
Fig.3  The change of hysteresis loops of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel with the number of cycles (N) at different strain amplitudes (εa)(a) εa=0.3% (b) εa=0.7% (c) εa=1.0%
Fig.4  Stabilized hysteresis loops of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel at each strain amplitude in the ascend test
Fig.5  Comparison of stable hysteresis loops of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel under the same strain amplitude
Fig.6  Cyclic stress response curves of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel (σa—stress amplitude)
Fig.7  Cyclic softening rate (δ-) of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel as a function of the plastic strain amplitude (εap)
Fig.8  TEM images of typical microstructures of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel after 786 cyc (εa=0.7%)(a) spatial dislocation structure in ferrite and planar dislocation structure in austenite(b) bright field image of ε martensite(c) dark field image of ε martensite (Inset shows the SAED pattern)
Fig.9  Cyclic stress-strain curves of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel (εap1εap corresponding to transition of A→B, εap2εap corresponding to transition of B→C or/and I→II)(a) σa-εa curve and σE-εE curve(b) σa-εap curves of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel and 329 DSS[19] in double logarithmic coordinate system

Steel

wN

%

Vγ

εap1

%

εap2

%

Magnin's[3]0.070.50-0.09
S32750[21]0.260.50-0.07
329[4]0.0720.380.0070.05
2205[19]0.130.450.010.06
2507[19]0.240.560.010.06
Fe-19.6Cr-2Ni-2.9Mn-1.6Si0.210.47-0.02
Table 1  Cyclic deformation stage characteristic data of typical DSSs[3,4,19,21]
[1] Zhao Y, Zhang W N, Liu X, et al. Development of TRIP-aided lean duplex stainless steel by twin-roll strip casting and its deformation mechanism [J]. Metall. Mater. Trans., 2016, 47A: 6292
[2] Herrera C, Ponge D, Raabe D. Design of a novel Mn-based 1 GPa duplex stainless TRIP steel with 60% ductility by a reduction of austenite stability [J]. Acta Mater., 2011, 59: 4653
[3] Magnin T, Lardon J M, Coudreuse L. Low Cycle Fatigue [M]. West Conshohocken, PA: ASTM International, 1988: 812
[4] Mateo A, Llanes L, Iturgoyen L, et al. Cyclic stress-strain response and dislocation substructure evolution of a ferrite-austenite stainless steel [J]. Acta Mater., 1996, 44: 1143
[5] Polák J, Petrenec M, Kruml T. Cyclic plastic response and fatigue life in superduplex 2507 stainless steel [J]. Int. J. Fatigue, 2010, 32: 279
[6] Guo B F, Zhang Q F, Chen L, et al. Influence of annealing temperature on the strain-hardening behavior of a lean duplex stainless steel [J]. Mater. Sci. Eng., 2018, A722: 216
[7] Kang J Y, Kim H, Kim K I, et al. Effect of austenitic texture on tensile behavior of lean duplex stainless steel with transformation induced plasticity (TRIP) [J]. Mater. Sci. Eng., 2017, A681: 114
[8] Choi J Y, Ji J H, Hwang S W, et al. TRIP aided deformation of a near-Ni-free, Mn-N bearing duplex stainless steel [J]. Mater. Sci. Eng., 2012, A535: 32
[9] Chen L, Li F, Zhang Y J, et al. Calculation for the phase diagram and stability of metastable austenite in a TRIP/TWIP duplex stainless steel [J]. J. Yanshan Univ., 2016, 40: 35
[9] (陈 雷, 李 飞, 张英杰等. 一种TRIP/TWIP型双相不锈钢的相图及其亚稳奥氏体组织稳定性计算 [J]. 燕山大学学报, 2016, 40: 35)
[10] Choi J Y, Ji J H, Hwang S W, et al. Effects of nitrogen content on TRIP of Fe-20Cr-5Mn-xN duplex stainless steel [J]. Mater. Sci. Eng., 2012, A534: 673
[11] Choi J Y, Ji J H, Hwang S W, et al. Strain induced martensitic transformation of Fe-20Cr-5Mn-0.2Ni duplex stainless steel during cold rolling: Effects of nitrogen addition [J]. Mater. Sci. Eng., 2011, A528: 6012
[12] Baudry G, Pineau A. Influence of strain-induced martensitic transformation on the low-cycle fatigue behavior of a stainless steel [J]. Mater. Sci. Eng., 1977, 28: 229
[13] Glage A, Weidner A, Biermann H. Effect of austenite stability on the low cycle fatigue behavior and microstructure of high alloyed metastable austenitic cast TRIP-steels [J]. Procedia Eng., 2010, 2: 2085
[14] Droste M, Ullrich C, Motylenko M, et al. Fatigue behavior of an ultrafine-grained metastable CrMnNi steel tested under total strain control [J]. Int. J. Fatigue, 2018, 106: 143
[15] Glage A, Weidner A, Biermann H. Cyclic deformation behaviour of three austenitic cast CrMnNi TRIP/TWIP steels with various Ni content [J]. Steel Res. Int., 2011, 82: 1040
[16] Pessoa D F, Kirchhoff G, Zimmermann M. Influence of loading frequency and role of surface micro-defects on fatigue behavior of metastable austenitic stainless steel AISI 304 [J]. Int. J. Fatigue, 2017, 103: 48
[17] Ackermann S, Kulawinski D, Henkel S, et al. Biaxial in-phase and out-of-phase cyclic deformation and fatigue behavior of an austenitic TRIP steel [J]. Int. J. Fatigue, 2014, 67: 123
[18] Alvarez-Armas I, Marinelli M C, Here?ú S, et al. On the cyclic softening behavior of SAF 2507 duplex stainless steel [J]. Acta Mater., 2006, 54: 5041
[19] Mateo A, Gironès A, Keichel J, et al. Cyclic deformation behaviour of superduplex stainless steels [J]. Mater. Sci. Eng., 2001, A314: 176
[20] Lillbacka R, Chai G, Ekh M, et al. Cyclic stress-strain behavior and load sharing in duplex stainless steels: Aspects of modeling and experiments [J]. Acta Mater., 2007, 55: 5359
[21] Alvarez-Armas I. Low cycle fatigue behavior on duplex stainless steels [J]. Trans. Indian Inst. Met, 2010, 63: 159
[22] Akdut N. Phase morphology and fatigue lives of nitrogen alloyed duplex stainless steels [J]. Int. J. Fatigue, 1999, 21: S97
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