Mechanical Characteristics of TRIP-Assisted Duplex Stainless Steel Fe-19.6Cr-2Ni-2.9Mn-1.6Si During Cyclic Deformation

doi:10.11900/0412.1961.2019.00220

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 Lei^1,²,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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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.

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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 (lgσ_a-lgε_a), 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)

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	CHEN Lei
	HAO Shuo
	ZOU Zongyuan
	HAN Shuting
	ZHANG Rongqiang
	GUO Baofeng

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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 (σ_E—engineering stress, ε_E—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 (ε_a)(a) ε_a=0.3% (b) ε_a=0.7% (c) ε_a=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 (σ_a—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 (ε_ap)

Fig.8 TEM images of typical microstructures of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel after 786 cyc (ε_a=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 (ε_ap1—ε_ap corresponding to transition of A→B, ε_ap2—ε_ap corresponding to transition of B→C or/and I→II)(a) σ_a-ε_acurve and σ_E-ε_Ecurve(b) σ_a-ε_apcurves of Fe-19.6Cr-2Ni-2.9Mn-1.6Si steel and 329 DSS^[19] in double logarithmic coordinate system

Table 1 Cyclic deformation stage characteristic data of typical DSSs^[3,4,19,21]

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